en_4j2_7d.pdf part of Daewoo Nubira/Lacetti Service Manual - Daewoo Lacetti.part01.rar, Also known as: Chevrolet Nubira / Lacetti, Chevrolet Optra Optra5, Suzuki Forenza Reno Covers the 1.4L, 1.6L and 1.8L engine. Year 2004 text manual preview

Text preview for : en_4j2_7d.pdf part of Daewoo Nubira/Lacetti Also known as: Chevrolet Nubira / Lacetti, Chevrolet Optra Optra5, Suzuki Forenza Reno Covers the 1.4L, 1.6L and 1.8L engine. Year 2004

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SECTION : 7D

AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
CAUTION : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.

TABLE OF CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 7D2 Fastener Tightening Specifications . . . . . . . . . . . 7D2 SCHEMATIC AND ROUTING DIAGRAMS . . . . . 7D3 A/C Sensors/Defoggers and A/C Compressor Controls Diagram . . . . . . . . . . . . . . . . . . . . . . . . 7D3 A/C Blower and Motor Controls Diagram . . . . . . 7D4 DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D5 GENERAL A/C DIAGNOSTICS . . . . . . . . . . . . . . . 7D5 V5 SYSTEM AIR CONDITIONING AND AUTOMATIC TEMPERATURE CONTROL (ATC) . . . . . . . . . . 7D5 SelfDiagnostic Circuit Check . . . . . . . . . . . . . . . 7D5 Automatic Temperature Controller Does Not Operate When Ignition Is ON . . . . . . . . . . . . . . 7D6 Controller Does Not Illuminate When Light Switch Is ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D7 No Hot Air From Blower . . . . . . . . . . . . . . . . . . . . 7D8 No Cool Air From Blower . . . . . . . . . . . . . . . . . . 7D10 Blower Motor Does Not Run At All . . . . . . . . . . 7D12 Mode Control Do Not Work . . . . . . . . . . . . . . . . Air Source Selection Not Controlled . . . . . . . . . Compressor Magnetic Clutch Does Not Engage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . Code 1 InCar Sensor Error . . . . . . . . . . . . . 7D14 7D16 7D17 7D18 7D18 Code 5 Sun Sensor Error . . . . . . . . . . . . . . . . 7D27 Code 6 Power Transistor Error . . . . . . . . . . . . 7D29 Code 7 MaxHi Relay Error . . . . . . . . . . . . . . 7D31 MAINTENANCE AND REPAIR . . . . . . . . . . . . . . 7D32 ONVEHICLE SERVICE . . . . . . . . . . . . . . . . . . . . 7D32 GENERAL A/C SYSTEM SERVICE PROCEURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D32 General Service Procedures . . . . . . . . . . . . . . . 7D32 SERVICEABLE COMPONENTS . . . . . . . . . . . . . 7D33 Common HVAC Components . . . . . . . . . . . . . . . 7D33 Automatic Temperature Control Assembly . . . . 7D33 Inlet Air Door Motor . . . . . . . . . . . . . . . . . . . . . . . 7D34 Mode Door Motor . . . . . . . . . . . . . . . . . . . . . . . . . 7D35 Air Mix Door Motor . . . . . . . . . . . . . . . . . . . . . . . . 7D35 Water Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D36 Ambient Air Temperature Sensor . . . . . . . . . . . 7D36 InCar Temperature Sensor . . . . . . . . . . . . . . . . 7D37 Sun Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D37 UNIT REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D39 V5 AIR CONDITIONING COMPRESSOR OVERHAUL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D39 Compressor Overhaul . . . . . . . . . . . . . . . . . . . . . 7D39 GENERAL DESCRIPTION AND SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D40 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 7D40 The V5 System . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D40 System Components Control . . . . . . . . . . . . . 7D40

Code 2 Ambient Air Temperature Sensor Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7D20 Code 3 Water Sensor Error . . . . . . . . . . . . . . . 7D22 Code 4 Air Mix Door Error . . . . . . . . . . . . . . . . 7D24

7D

2IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Application Blower Motor Resistor Screws Control Assembly Retaining Screws NSm 1.2 2 LbFt LbIn 11 18

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

3

SCHEMATIC AND ROUTING DIAGRAMS
A/C SENSORS/DEFOGGERS AND A/C COMPRESSOR CONTROLS DIAGRAM

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7D

4IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

A/C BLOWER AND MOTOR CONTROLS DIAGRAM

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

5

DIAGNOSIS
GENERAL A/C DIAGNOSTICS
Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System for details of the following procedures: S A/C Performance Test. S Insufficient Cooling "Quick Check" Procedure. S Insufficient Cooling Diagnosis. S S S S S Leak Testing the Refrigerant System. Low and HighSide Pressure Relationship Chart. Pressure Test Chart (R134a System). PressureTemperature Relationship of R134a. Testing the Refrigerant System.

V5 SYSTEM AIR CONDITIONING AND AUTOMATIC TEMPERATURE CONTROL (ATC)
3.

SELFDIAGNOSTIC CIRCUIT CHECK
The Daewoo fully automatic temperature controller (FATC) contains a selfdiagnosis function to aid in finding any problem with the system. To enter the diagnostic mode, perform the following procedure: 1. 2. Turn the ignition to ON. Set the temperature control to 26°C (79°F). 4. 5.

6.

Within 3 seconds, push the AUTO and the OFF switches simultaneously, more than three times. Count the number of times the temperature indicator screen blinks. If there are no error codes set, the screen will not blink. When the controller indicates an error code, proceed to the table for that code. Push the OFF switch to return the controller to its normal functions.

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6IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

AUTOMATIC TEMPERATURE CONTROLLER DOES NOT OPERATE WHEN IGNITION IS ON
Step 1 2 3 Check the fuse F7. Is fuse F7 blown? Replace fuse F7. Is the repair complete? 1. Remove the controller. 2. Measure the voltage between connectors A5 and A14. Is the voltage within the specified value? 1. Check the controller for damage. 2. Replace the controller if it is damaged. Is the repair complete? Check the voltage between terminal A1 and ground. Is this voltage as specified? 1. Check the wiring harness between fuse F7 and the terminal A5 for damage. 2. Replace the wiring harness if it is damaged. Is the repair complete? 1. Check the wiring harness between terminal A14 and ground G203 for damage. 2. Repair the wiring harness, or ground connection as required. Is the repair complete? Action Value(s) 1114 v Yes Go to Step 2 System OK Go to Step 4 No Go to Step 3 Go to Step 5

4

System OK

5 6

0v

Go to Step 6 System OK

Go to Step 7

7

System OK

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7

CONTROLLER DOES NOT ILLUMINATE WHEN LIGHT SWITCH IS ON
Step 1 Action Check other instrumentation lights. Are those lights also off? Value(s) Yes Go to Section 9E, Instrumentation/Driver Information Go to Step 4 No Go to Step 2

2

1. Remove the controller. 2. Check the voltage between terminals A3 and A4 of the controller connector. Is the voltage within the specified value? Repair the wiring harness between splice S204 and controller connector terminal A4 or between splice S203 and controller connector terminal A3. Is the repair complete? Check the illumination lamps. Is one burned out? Replace the burned out illumination lamp. Is the repair complete?

1114 v

Go to Step 3

3

System OK

4 5

Go to Step 5 System OK

Go to Step 6

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8IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

NO HOT AIR FROM BLOWER
Step 1 2 3 Action Check the coolant level. Is the coolant level correct? Add coolant as needed. Is the heater operating? 1. Turn the ignition to ON. 2. Observe the temperature indication screen of the controller. Does the digit flash on and off? Run a selfdiagnosis circuit check. Does the display indicate a defect code? Observe the blower motor operation. Is the blower motor functioning at all? Use the blower push switch to cycle the blower through its different speeds. Does the motor function at different speeds? 1. Run the blower and operate the MODE push switch manually. 2. Check for airflow out the various outlets. Does the air flow from the different outlets as it should? 1. Remove the heater outlet and check for obstructions. 2. Remove any obstructions found. Is the heater operating? Observe the air mix door (AMD) motor while changing the temperature setting from 18 to 32°C (64 to 90°F) and then from 32 to 18°C (90 to 64°F). Is the AMD motor functioning properly? Check the coolant hoses for leaks or kinks. Are the coolant hoses in good condition? Repair any problem with the coolant hoses. Is the heater operating? Check the surge tank cap. Is the surge tank cap in good condition? Repair or replace the surge tank cap as needed. Is the heater operating? 1. Set the A/C switch to OFF. 2. Set the temperature control to 32°C (90°F). 3. Set the blower motor speed to full high (all segments illuminated on the display). 4. Remove the surge tank cap. 5. Start the vehicle and run the engine at idle. 6. Watch for the flow of the coolant when the thermostat opens. Does the coolant flow? Value(s) Yes Go to Step 3 System OK Go to Step 4 No Go to Step 2 Go to Step 3 Go to Step 5

4

Go to the table for the code that flashes Go to Step 6

Go to Step 7

5

Go to "Blower Motor Does Not Run at All" Go to "Code 6 Power Transistor Error" Go to Step 8

6

Go to Step 7

7

Go to Step 9

8

System OK

Go to Step 9

9

Go to Step 10

Go to"Code 4 Air Mix Door Error" Go to Step 11 Go to Step 12 Go to Step 13 Go to Step 14 Go to Step 15

10 11 12 13 14

Go to Step 12 System OK Go to Step 14 System OK Go to Step 16

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

9

Step 15

Action 1. Check for S A faulty thermostat. S A failed coolant pump impeller. S A restriction in the cooling system. 2. Make repairs as needed. Is the repair complete? Check the temperature of the heater inlet and outlet hoses by feel. Is the heater inlet hose hot and the outlet hose warm? Back flush or replace the heater core. Is the repair complete? Check the vehicle for cold air leaks at the S Dash. S Heater cases. S Vents. Are any leaks found? Repair any cold air leaks. Is the repair complete? Check the coolant temperature sensor using the tests in "Code 3 Coolant Temperature Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete? Check the incar sensor using the tests in "Code 1 InCar Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete? Check the ambient air temperature sensor using the tests in "Code 2 Ambient Air Temperature Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete? Check the sun sensor using the tests in "Code 5 Sun Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete? Replace the ATC controller. Is the repair complete?

Value(s)

Yes System OK

No

16

Go to Step 18

Go to Step 17

17 18

System OK Go to Step 20

Go to Step 19

19 20

System OK Go to Step 21

Go to Step 22

21

System OK

22

Go to Step 23

Go to Step 24

23

System OK

24

Go to Step 25

Go to Step 26

25

System OK

26

Go to Step 27

Go to Step 28

27

System OK

28

System OK

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10IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

NO COOL AIR FROM BLOWER
Step 1 Action 1. Turn the ignition to ON. 2. Observe the temperature indication screen of the controller. Does the digit flash on and off? Run a selfdiagnosis circuit check. Does the display indicate a defect code? Observe the blower motor operation. Is the blower motor functioning at all? Use the blower push switch to cycle the blower through its different speeds. Does the motor function at different speeds? 1. Run the blower and operate the MODE push switch manually. 2. Check for airflow out the various outlets. Does the air flow from the different outlets as it should? 1. Remove the heater outlet and check for obstructions. 2. Remove any obstructions found. Is the heater operating? Observe the air mix door motor (AMD) while changing the temperature setting from 18 to 32°C (64 to 90°F) and then from 32 to 18°C (90 to 64°F). Is the AMD motor functioning properly? Perform the checks found in "Insufficient Cooling Diagnosis." Is the system operating normally now? Place the controller in the AUTO mode. Is smoke taken into the intake port of the incar sensor? Check the intake hose for the incar sensor. Is the hose in good condition? Repair or replace the intake hose. Is the repair complete? Check the incar sensor using the tests in "Code 1 InCar Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete? Check the ambient air temperature sensor using the tests in "Code 2 Ambient Air Temperature Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Value(s) Yes Go to Step 2 No Go to Step 3

2

Go to the table for the code that flashes. Go to Step 4

Go to Step 7

3

Go to "Blower Motor Does Not Run at All" Go to"Code 6 Power Transistor Error" Go to Step 6

4

Go to Step 5

5

Go to Step 7

6

System OK

Go to Step 9

7

Go to Step 8

Go to"Code 3 Air Mix Door Error" Go to Step 9

8

System OK

9

Go to Step 12

Go to Step 10

10 11 12

Go to Step 12 System OK Go to Step 13

Go to Step 11 Go to Step 14

13

System OK

14

Go to Step 15

Go to Step 16

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Step 15

Action Repair or replace the sensor, the wiring, or the controller, as required. Is the repair complete? Check the sun sensor using the tests in "Code 5 Sun Sensor Error." Is there a problem indicated in the sensor, the sensor wiring, or the controller? Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete? Perform the coolant temperature sensor test. Is the coolant temperature sensor malfunctioning? Replace the coolant temperature sensor. Is the repair complete? Replace the ATC controller. Is the repair complete?

Value(s)

Yes System OK

No

16

Go to Step 17

Go to Step 18

17

System OK

18 19 20

Go to Step 19 System OK System OK

Go to Step 20

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12IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

BLOWER MOTOR DOES NOT RUN AT ALL
Step 1 Action 1. Turn the ignition to ON. 2. Observe the temperature indication screen of the controller. Does the digit go on and off? Run a selfdiagnosis circuit check. Does the display indicate a defect code? Check fuse F7 in the I/P fuse block. Is this fuse in good condition? Replace fuse F7. Is the repair complete? Check fuse EF3 in the engine fuse block. Is this fuse in good condition? Replace fuse EF3. Is the repair complete? 1. Turn the ignition switch to ON. 2. Measure the voltage between ground and terminal 87(Violet) of the blower relay. Is the voltage within the specified value? Measure the voltage between ground and terminal 86 (Brown) at the blower relay. Is the voltage within the specified value? Value(s) Yes Go to Step 2 No Go to Step 3

2

Go to the table for the code that flashes. Go to Step 5 System OK Go to Step 7 System OK Go to Step 15

3 4 5 6 7

1114 v

Go to Step 4 Go to Step 6 Go to Step 8

8

1114 v

Go to Step 10

Go to Step 9

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

13

Step 9

Action 1. Turn the ignition switch to OFF. 2. Check circuit (Brown) between terminal 86 of the blower relay to F7 in the I/P fuse block. 3. Repair any problem found in the wiring or terminals at the relay socket or connector C203. Is the repair complete? Measure the voltage between ground and terminal 30 (Red) at the blower relay. Is the voltage within the specified value? 1. Turn the ignition switch to OFF. 2. Check circuit (Red) between terminal 30 of the blower relay to EF3 in the engine fuse block. 3. Repair any problem found in the wiring or terminals at the fuse block connector C105, connector C202, or at the relay socket. Is the repair complete? 1. Turn the ignition switch to OFF. 2. Check the continuity in the wiring harness between the blower relay terminal 85 (Black) and ground. Does the ohmmeter show the specified value? Repair any problem found in terminal 85 at the relay connector, circuit (Black), Connector C201, or ground G201. Is the repair complete? Replace the blower relay. Is the repair complete? 1. Turn the ignition switch to OFF. 2. Disconnect the wiring harness at the blower motor. 3. Turn the ignition switch to ON. 4. Measure voltage between ground and blower connector 1 (Yellow). Is the voltage within the specified value? 1. Turn the ignition switch to OFF. 2. Check circuit (Yellow) between blower connector terminal 1 and blower relay terminal 87. 3. Repair any problem found in the wiring or a connector terminal at the blower connector, connector C208, or the blower relay socket. Is the repair complete? Measure the resistance between the connector terminals on the blower motor. Does the resistance match the specified value? Replace the blower motor. Is the repair complete? Measure the resistance of circuit (Violet) between terminal 2 of the blower connector and terminal 30 of the Max HI relay and terminal 6 of the power transistor. Does the resistance match the specified value?

Value(s)

Yes System OK

No

10

1114 v

Go to Step 12

Go to Step 11

11

System OK

12

[0

Go to Step 14

Go to Step 13

13

System OK

14 15

1114 v

System OK Go to Step 17

Go to Step 16

16

System OK

17

[5

Go to Step 19

Go to Step 18

18 19

[0

System OK Go to Step 21

Go to Step 20

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14IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
Action Repair the problem in circuit (Violet). Is the repair complete? Measure the resistance of circuit (Black) from terminal 3 of the power transistor connector to ground. Does the resistance match the specified value? 1. Trace circuit (Black) from terminal 3 of the power transistor connector and terminal 87 of the Max HI relay to ground G203. 2. Repair any problem found in the wiring, ground G203. Is the repair complete? Replace the ATC controller. the repair complete? Value(s) [0 Yes System OK Go to Step 23 No Go to Step 22

Step 20 21

22

System OK

23

System OK

MODE CONTROL DO NOT WORK
Refer to "A/C Blower and Motor Controls Diagram"for the electrical schematic diagram of the circuits described in this procedure.

Mode Controls Do Not Work
Step 1 Action Measure the voltage between terminal 4 and terminal 5 of the mode motor. Is the voltage within the specified value for motor? 1. Check fuse F7? 2. Check the connector and circuit (Brown and Black) for any wiring or terminal problems. 3. Repair any problems found. Is the repair complete? 1. Using the Motor Control Table, measure the voltages at the specified terminals of the specified motor connectors. 2. Change the mode settings and observe the voltage changes. Are the voltages as specified? Replace the motor that does not operate properly. Is the repair complete? 1. Using the Motor Control Table, measure the voltages at the specified terminals of the specified controller connectors. 2. Change the mode settings and observe the voltage changes. Are the voltages as specified? 1. Check the wiring harness and connectors between the controller and the motor that is not performing properly. 2. Repair or replace the wiring harness or the defective terminal. Is the repair complete? Check the connector at the controller. Is there a defective terminal? Value(s) 1114 v Yes Go to Step 3 No Go to Step 2

2

System OK

3

See the "Motor Control Table"

Go to Step 4

Go to Step 5

4 5

See the "Motor Control Table"

System OK Go to Step 6

Go to Step 7

6

System OK

7

Go to Step 8

Go to Step 9

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15

Step 8 9

Action Repair or replace the terminal. Is the repair complete? Replace the controller. Is the repair complete?

Value(s)

Yes System OK System OK

No

Motor Control Table
Mode Setting Controller/ Motor B16/3 Vent BiLevel Foot Foot/Defrost Defrost 1114 v 1114 v 1114 v 1114 v 0v Controller/ Motor B17/2 1114 v 1114 v 1114 v 0v 1114 v Mode Motor Connector Terminal Controller/ Motor B18/1 1114 v 1114 v 0v 1114 v 1114 v Controller/ Motor B19/7 1114 v 0v 1114 v 1114 v 1114 v Controller/ Motor B20/6 0v 1114 v 1114 v 1114 v 1114 v

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16IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

AIR SOURCE SELECTION NOT CONTROLLED
Refer to "A/C Blower and Motor Controls Diagram" for the electrical schematic diagram of the circuits described in this procedure.

Air Source Selection Not Controlled
Step 1 Action Measure the voltage at terminal 4 of the intake motor. Is the voltage within the value specified? 1. Check the connector and circuit (Brown) for any wiring or terminal problems. 2. Repair any problems found. Is the repair complete? Value(s) 1114 v Yes Go to Step 3 No Go to Step 2

2

System OK

3

See the "Intake 1. Using the Intake Motor Table, measure the Motor Table" voltages between terminal 4 and terminal 5 of the motor connector. 2. Change the intake setting and observe the voltage changes. Are these voltages within the specified value? Replace the intake motor. Is the repair complete?

Go to Step 4

Go to Step 5

4 5

System OK Go to Step 6

Go to Step 7

See the "Intake 1. Using the Intake Motor Table, measure the Motor Table" voltages between terminal 4 and terminal 7 of the motor connector. 2. Change the intake setting and observe the voltage changes. Are these voltages within the specified value? 1. Check the wiring harness and connectors between the controller and the motor that is not performing properly. 2. Repair or replace the wiring harness or the defective terminal. Is the repair complete? Check the connector at the controller. Is there a defective terminal? Repair or replace the terminal. Is the repair complete? Replace the controller. Is the repair complete?

6

System OK

7 8 9

Go to Step 8 System OK System OK

Go to Step 9

Intake Control Table
Intake Setting Controller/Motor B14/7 Recirculate Fresh 1114 v 0v Intake Motor Connector Terminal Controller/Motor B13/5 0v 1114 v

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

17

COMPRESSOR MAGNETIC CLUTCH DOES NOT ENGAGE
Step 1 Action 1. Remove the ATC Controller from the instrument panel, keeping the wiring harness connected. 2. Turn the ignition switch to ON. 3. Turn the A/C switch to ON. 4. Check the voltage between ground and terminal A11 on the controller. Is the voltage within the specified value? Replace the ATC controller. Is the repair complete? Value(s) 1114 v Yes Go to "Insufficient Cooling Diagnosis" No Go to Step 2

2

System OK

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18IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

DIAGNOSTIC TROUBLE CODES

CODE 1 INCAR SENSOR ERROR
This code will set if the output of the incar sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the ATC controller.

Code 1 InCar Sensor Error
Step 1 Action 1. Disconnect the incar sensor connector from the ATC controller. 2. Examine the wiring from the sensor to the connector and the connector for any signs of damage. 3. Measure the resistance between the incar sensor connector terminals. Is there any sign of damage in the wiring or connector, or is the resistance outside the specified value at 20 to 25°C (68 to 77°F)? Repair the damaged wiring or the connector, or replace the incar sensor as required. Is the repair complete? 1. Turn the ignition to ON. 2. Measure the voltage between the two connector terminals on the controller housing. Is the voltage equal to the value specified? Check the terminals on the incar sensor connector. Is any problem found with the connector? Repair the connector terminals or replace the incar sensor or ATC controller as required. Is the repair complete? Value(s) 26002100 Yes Go to Step 2 No Go to Step 3

2

System OK

3

>4v

Go to Step 7

Go to Step 4

4 5

Go to Step 5 System OK

Go to Step 6

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

19

Step 6

Action 1. Reconnect the incar sensor to the controller. 2. Turn the ignition switch to ON. 3. Observe the temperature display area. Does this display indicate the continuing presence of a code 1 condition? Replace the ATC controller. Is the repair complete?

Value(s)

Yes Go to Step 7

No System OK

7

System OK

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20IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

CODE 2 AMBIENT AIR TEMPERATURE SENSOR ERROR
This code will set if the output of the ambient air temperature sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the ATC controller.

Code 2 Ambient Air Temperature Sensor Error
Step 1 Action 1. Disconnect the ambient air sensor connector from the front bumper harness. 2. Measure the resistance between the ambient air sensor connector terminals. Is the resistance equal to the specified value at 20 to 25°C (68 to 77°F)? 1. Remove the ambient air sensor from behind the front bumper. 2. Examine the wiring for any open or short and examine the connector for any damage. Is there a problem with the wiring or the connector? Repair the problem found in the ambient air sensor wiring or the connector. Is the repair complete? Replace the ambient air sensor. Is the repair complete? 1. Turn the ignition to ON. 2. Measure the voltage between the two terminals in the ambient air sensor connector on the front bumper harness. Is the voltage equal to the value specified? 1. Reconnect the incar sensor to the controller. 2. Turn the ignition switch to ON. 3. Observe the temperature display area. Does this display indicate the continuing presence of a code 2 condition? Value(s) 26002100 Yes Go to Step 5 No Go to Step 2

2

Go to Step 3

Go to Step 4

3

System OK

4 5

>4v

System OK Go to Step 7

Go to Step 6

6

Go to Step 8

System OK

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21

Step 7

Action 1. Pull the ATC controller from the instrument panel, leaving the wiring harness connected. 2. Measure the voltage between terminals A13 and B8 by backprobing the connectors. Is the voltage equal to the value specified? Replace the ATC Controller. Is the repair complete? 1. Trace the wiring for the ambient air sensor from the ATC controller, through connectors C209, C208, C202 and C303 to the ambient air sensor connector on the front bumper harness. 2. Repair any open or high resistance condition in the wiring or a connector terminal. Is the repair complete?

Value(s) <4v

Yes Go to Step 8

No Go to Step 9

8 9

System OK System OK

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22IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

CODE 3 WATER SENSOR ERROR
This code will set if the output of the coolant sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the ATC controller.

Code 3 Water Sensor Error
Step 1 Action 1. Disconnect the coolant temperature sensor connector from the ATC harness. 2. Examine the wiring from the sensor to the connector and examine the connector for any signs of damage. 3. Measure the resistance between the coolant temperature sensor connector terminals. Is there any sign of damage in the wiring or the connector, or is the resistance outside the specified value at 20 to 25°C (68 to 77°F)? Repair the damaged wiring or the connector, or replace the coolant temperature sensor as required. Is the repair complete? 1. Turn the ignition to ON. 2. Measure the voltage between the two coolant temperature sensor connector terminals on the ATC harness. Is the voltage equal to the specified value? Check the terminals on the coolant temperature sensor connector. Is any problem found with the connector? Repair the connector terminals or replace the coolant temperature sensor or ATC controller as required. Is the repair complete? Value(s) 26002100 Yes Go to Step 2 No Go to Step 3

2

System OK

3

<4v

Go to Step 7

Go to Step 4

4

Go to Step 5

Go to Step 6

5

System OK

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

23

Step 6

Action 1. Reconnect the coolant temperature sensor to the ATC harness. 2. Turn the ignition switch to ON. 3. Observe the temperature display area. Does this display indicate the continuing presence of a code 3 condition? 1. Pull the ATC controller from the instrument panel, leaving the wiring harness connected. 2. Measure the voltage between terminals A13 and B9 by backprobing the connectors. Is the voltage equal to the value specified? 1. Trace the wiring from controller terminals A13 and B9 to the coolant temperature sensor connector terminals on the ATC harness connectors. 2. Repair any open or high resistance found in the wiring or connector terminals. Is the repair complete? Replace the ATC controller. Is the repair complete?

Value(s)

Yes Go to Step 9

No System OK

7

<4v

Go to Step 9

Go to Step 8

8

System OK

9

System OK

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24IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

CODE 4 AIR MIX DOOR ERROR
This code will set if the output of the mix door indicator indicates that the door opening angle is out of range or does not change value when the door should be moving. This would indicate a short circuit or an open in the sensor or the associated wiring harness, a door motor that is not operating, or a malfunction of the ATC controller.

Code 4 Air Mix Door Error
Step 1 Action 1. Disconnect the I/P wiring harness connector from the air mix door (AMD) motor. 2. Use an ohmmeter to measure the resistance between terminals 5 and 7 on the AMD motor. Does the measured resistance indicate an open or a shorted condition? Measure the resistance between terminals 2 and 3 on the AMD motor. Is the resistance equal to the value specified? Measure the resistance between terminals 6 and 2 and between terminals 6 and 3 on the AMD motor. Do these resistances add to approximately the value measured between terminals 2 and 3? Replace the AMD motor. Is the repair complete? Check the connector terminals at the AMD motor and the wiring in the ATC harness. Is there a problem with any terminal on either the harness connector or the motor connector or the wiring? Repair the problem found with a connector terminal or the wiring, or replace the motor as required. Is the repair complete? Value(s) Open = R, Short = [ 0 Yes Go to Step 4 No Go to Step 2

2

[ 3000

Go to Step 3

Go to Step 4

3

[ 3000

Go to Step 5

Go to Step 4

4 5

System OK Go to Step 6

Go to Step 7

6

System OK

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

25

Step 7

Action 1. Remove the ATC controller from the instrument panel. 2. Disconnect the harness connectors from the ATC controller. 3. Examine the connector terminals on the harness connectors and the controller connectors and the harness wiring. Is there a problem with any of these connectors or the wiring? Repair the problem found with a connector terminal or wiring. Is the repair complete? Check continuity in the harness between the controller connectors and the AMD motor connector. S Controller terminal A2 to motor terminal 7. S Controller terminal A8 to motor terminal 5. S Controller terminal B6 to motor terminal 2. S Controller terminal B5 to motor terminal 6. S Controller terminal B4 to motor terminal 3. Does the continuity equal the specified value? Repair the continuity problem. Is the repair complete? 1. Reconnect the AMD motor to the ATC harness. 2. Reconnect the ATC harness connectors to the controller. 3. Turn the ignition to ON. 4. Use backprobing for voltage measurements. 5. Measure the voltage between ground and terminal B5 at the controller. Is the voltage equal to the specified value? 1. Set the temperature controller to 18°C (64°F). 2. Connect a voltmeter between ground and terminal A8 at the controller. It should display about 12 v. 3. Raise the temperature setting on the controller to 32°C (90°F). Does the voltage equal the specified value? 1. Connect a voltmeter between ground and terminal A2 at the controller. It should display about 12 v. 2. Change the temperature setting to 18°C (64°F). Does the voltage equal the specified value? 1. Recheck the wiring harness and the connector terminals associated with controller terminals B4, B5, and B6, and AMD motor terminals 2, 6, and 3. 2. Repair any problem found. Is the repair complete? Recheck all wiring circuits between the controller and the AMD motor. Is there a problem in the wiring or the connectors?

Value(s)

Yes Go to Step 8

No Go to Step 9

8

System OK

9

[0

Go to Step 10

Go to Step 11

10 11

<4v

System OK Go to Step 12

Go to Step 14

12

Drops from 12 v to 0 v

Go to Step 13

Go to Step 15

13

Drops from 12 v to 0 v

Go to Step 20

Go to Step 15

14

System OK

15

Go to Step 16

Go to Step 17

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26IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
Action Repair the problem in the wiring between the ATC controller and the AMD motor. Is the repair complete? Recheck the AMD motor. Is there a problem in the AMD motor? Replace the AMD motor. Is the repair complete? Replace the controller. Is the repair complete? Observe the operation of the air mix door when the temperature setting is changed. Does the door move normally? Repair or replace the air mix door. Is the repair complete? Observe the operation of the AMD motor when the temperature setting is changed. Does the motor operate normally? Replace the AMD motor. Is the repair complete? Reconnect everything and test the system. Does code 4 reset? Replace the controller. Is the repair complete? Value(s) Yes System OK No

Step 16

17 18 19 20

Go to Step 18 System OK System OK Go to Step 22

Go to Step 19 Go to Step 21

21 22

System OK Go to Step 24

Go to Step 23

23 24 25

System OK Go to Step 25 System OK

System OK

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27

CODE 5 SUN SENSOR ERROR
This code will set if the output of the sun sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the ATC controller.

Code 5 Sun Sensor Error
Step 1 Action 1. Lift the sun sensor from the top of the dashboard. 2. Secure the ATC harness below the sun sensor connector so it cannot fall through the opening in the top of the dashboard. 3. Disconnect the sun sensor connector from the ATC harness. 4. Examine the wiring from the sensor to the connector, and examine the connector for any signs of damage. 5. Measure the resistance between the sun sensor connector terminals. Is there any sign of damage in the wiring or connector or does the resistance equal the value specified? Repair the damaged wiring or the connector, or replace the sun sensor as required. Is the repair complete? 1. Turn the ignition to ON. 2. Measure the voltage between the two sun sensor connector terminals on the ATC harness. Is the voltage equal to the specified value? Check the terminals on the sun sensor connector. Is any problem found with the connector? Repair the connector terminals or replace the sun sensor or ATC controller as required. Is the repair complete? Value(s) [0W Yes Go to Step 2 No Go to Step 3

2

System OK

3

<4v

Go to Step 7

Go to Step 4

4 5

Go to Step 5 System OK

Go to Step 6

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28IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
Action 1. Reconnect the sun sensor to the ATC harness. 2. Turn the ignition switch to ON. 3. Observe the temperature display area. Does this display indicate the continuing presence of a code 5 condition? 1. Pull the ATC controller from the instrument panel, leaving the wiring harness connected. 2. Measure the voltage between terminals A13 and B10 by backprobing the connectors. Is the voltage equal to the value specified? 1. Trace the wiring from controller terminals A13 and B10 to the sun sensor connector terminals on the ATC harness connectors. 2. Repair any open or high resistance found in the wiring or connector terminals. Is the repair complete? Replace the ATC controller. Is the repair complete? Value(s) Yes Go to Step 9 No System OK

Step 6

7

<4v

Go to Step 9

Go to Step 8

8

System OK

9

System OK

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29

CODE 6 POWER TRANSISTOR ERROR
Step 1 Action 1. Disconnect the ATC controller connectors A and B. 2. Disconnect the connectors from the power transistor. 3. Measure the resistance circuit GRY/BLK from terminal 4 of the power transistor to terminal B1 of the ATC controller. Does the resistance equal the specified value? Measure the resistance in the circuit from terminal 1 of the power transistor to terminal B12 of the ATC controller. Does the resistance equal the specified value? 1. Reconnect the wiring harness to the ATC controller and to the power transistor. 2. Turn the ignition switch to ON. 3. Measure the voltage from ground to terminal B12 of the ATC controller. 4. Cycle the fan speed controller manually from the lowest (speed 1) to the highest speed (8). Do the voltages measured match approximately the specified values within ±0.5 v? Replace the ATC controller. Is the repair complete? Value(s) [0W Yes Go to Step 2 No Go to Step 6

2

[0

Go to Step 3

Go to Step 6

3

1: 4.0 v 2: 5.0 v 3: 6.0 v 4: 7.0 v 5: 8.0 v 6: 9.0 v 7: 10.0 v 8: Max Hi:

Go to Step 4

Go to Step 5

4

System OK

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30IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
Action Measure the resistance in circuit (Violet) between terminal 6 of the power transistor and the blower motor terminal 2. Does the resistance equal the specified value? Repair or replace the wiring harness for the circuit (Violet). Is the repair complete? Check the wiring harness of the motor and power supply. S Check the blower relay. S Check fuse EF3. Is there any problem in the wiring, the relay, or the fuse? Replace the power transistor. Is the repair complete? Repair or replace the wiring harness, the relay, or the fuse as required. Is the repair complete? Value(s) [0 Yes Go to Step 7 No Go to Step 6

Step 5

6

System OK

7

Go to Step 9

Go to Step 8

8 9

System OK System OK

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AUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D

31

CODE 7 MAXHI RELAY ERROR
Step 1 Action 1. Turn the ignition switch ON. 2. Set the blower speed manually for maximum speed. 3. Measure voltage between the ATC controller terminal A10 and ground. Is the voltage approximately equal to the specified value? Replace the ATC controller. Is the repair complete? 1. Check the wiring harness associated with the MAXHI relay for defects or high terminal resistance. 2. Repair any defects found. Is the repair complete? Replace the MAXHI relay. Is the repair complete? Value(s) [0 Yes Go to Step 3 No Go to Step 2

2 3

System OK System OK

Go to Step 4

4

System OK

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7D 32IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

MAINTENANCE AND REPAIR
ONVEHICLE SERVICE GENERAL A/C SYSTEM SERVICE PROCEDURES GENERAL SERVICE PROCEDURES
Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System, for details of the following procedures: S S S S S Discharging, Adding Oil, Evacuating, and Charging Procedures for A/C System. Handling of Refrigerant Lines and Fittings. Handling Refrigerant. Maintaining Chemical Stability in the Refrigeration System. ORing Replacement.

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SERVICEABLE COMPONENTS COMMON HVAC COMPONENTS
Those components used in nonautomatic systems are covered in other sections of this manual. Refer to Section 7A, Heating and Ventilation System for the following procedures: S Blower Motor. S Heater Hoses. S Blower Resistor. S HighBlower Relay. S Heater/Air Distributor Case Assembly (A/C Module). S Heater Core. Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System, for the following procedures: S A/C Pressure Transducer. S A/C Compressor Relay. S Air Filter. S A/C Expansion Valve. S A/C HighPressure Pipe Line. S Evaporator Core. S A/C Suction Hose Assembly. S A/C Discharge HoseCompressor to Condenser. S Compressor. S Condenser. S ReceiverDryer.

AUTOMATIC TEMPERATURE CONTROL ASSEMBLY
Removal Procedure
1. 2. 3. Disconnect the negative battery cable. Remove the center molding assembly. Refer to Section 9E, Instrumentation/Driver Information. Pull out the unit to gain access to the rear.

4. 5.

Disconnect the electrical connectors. Remove the center molding assembly from the instrument panel.

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7D 34IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
6. 7. Remove the control assembly retaining screws. Remove the automatic temperature control assembly.

Installation Procedure
1. Position the automatic temperature control assembly on the center molding and install the retaining screws.

Tighten
Tighten the control assembly retaining screws to 2 NSm (18 lbin). 2. 3. 4. Connect the electrical connectors. Install the center molding assembly. Refer toSection 9E, Instrumentation/Driver Information. Connect the negative battery cable.

INLET AIR DOOR MOTOR
(LeftHand Drive Shown, RightHand Drive Similar) Removal Procedure
1. 2. 3. 4. 5. 6. 7. Disconnect the negative battery cable. Remove the glove box. Refer to Section 9E, Instrumentation/Driver Information. Remove the actuating rod by snapping the rod out of the lever with needlenose pliers. Disconnect the electrical connector. Remove a screw and the bracket mounting high blower relay. Remove the motor retaining screws. Remove the motor.

Installation Procedure
1. 2. 3. 4. 5. 6. Install the motor with the retaining screws. Install the actuating rod. Connect the electrical connector. Install the bracket mounting highblower relay with a screw. Remove the glove box. Refer to Section 9E, Instrumentation/Driver Information. Connect the negative battery cable.

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IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D 35

MODE DOOR MOTOR
(LeftHand Drive Shown, RightHand Drive Similar) Removal Procedure
1. 2. 3. 4. 5. 6. Disconnect the negative battery cable. Remove the instrument panel under cover. Refer toSection 9G, Interior Trim. Disconnect the electrical connector. Remove the motor actuating rod by snapping out it out of the lever with needlenose pliers. Remove the motor retaining screws. Remove the mode door motor.

Installation Procedure
1. 2. 3. 4. 5. Install the mode door motor with the retaining screws. Install the actuating rod. Connect the electrical connector. Install the instrument panel under cover.Section 9G, Interior Trim. Connect the negative battery cable.

AIR MIX DOOR MOTOR
Removal Procedure
Important : Operate the automatic temperature control system and rotate the temperature control knob until the temperature reaches to the maximum. 1. Disconnect the negative battery cable. 2. Remove the glove box lower panel cover. Refer to Section 9E, Instrumentation/Driver Information. 3. Disconnect the electrical connector. 4. Remove the actuating rod by snapping it out of the lever with needlenose pliers. 5. Remove the motor retaining screws. 6. Remove the temperature door motor.

Installation Procedure
1. 2. 3. 4. 5. Install the temperature door motor with the retaining screws. Install the actuating rod onto the lever. Connect the electrical connector. Install the glove box. Refer to Section 9E, Instrumentation/Driver Information. Connect the negative battery cable.

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7D 36IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

WATER SENSOR
(LeftHand Drive Shown, RightHand Drive Similar) Removal Procedure
1. 2. 3. 4. 5. Disconnect the negative battery cable. Remove the instrument panel under cover. Refer to Section 9G, Interior Trim. Disconnect the electrical connector. Remove the sensor retaining screw. Remove the sensor.

Installation Procedure
1. 2. 3. 4. Install the sensor with the retaining screw. Connect the electrical connector. Install the instrument panel under cover. Refer toSection 9G, Interior Trim. Connect the negative battery cable.

AMBIENT AIR TEMPERATURE SENSOR
Removal Procedure
1. 2. 3. Disconnect the negative battery cable. Disconnect the ambient air temperature sensor electrical connector. Remove the ambient air temperature sensor from the bracket.

Installation Procedure
1. 2. 3. Install the ambient air temperature sensor into its bracket. Connect the electrical connector. Connect the negative battery cable.

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IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7D 37

INCAR TEMPERATURE SENSOR
Removal Procedure
1. 2. 3. 4. Disconnect the negative battery cable. Remove the instrument panel under cover. Refer to Section 9G, Interior Trim. Disconnect the electrical connector. Remove the tube by turning it clockwise.

5. 6.

Remove the screws. Remove the incar sensor with the tube.

Installation Procedure
1. 2. 3. 4. 5. Install the incar sensor. Install the incar sensor retaining screws and tighten. Install the air inlet tube and connect the electrical connector. Install the instrument panel under cover. Refer to Section 9G, Interior Trim. Connect the battery negative cable.

SUN SENSOR
Removal Procedure
1. 2. 3. 4. Disconnect the negative battery cable. Gently pry up on the sun sensor to remove it. Secure the electrical connector to prevent it from falling beneath the dash. Disconnect the electrical connector and remove the sun sensor.

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7D 38IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM Installation Procedure
1. 2. 3. Connect the electrical connector. Insert and press the sun sensor into position in the dash. Connect the negative battery cable.

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UNIT REPAIR V5 AIR CONDITIONING COMPRESSOR OVERHAUL COMPRESSOR OVERHAUL
Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System for details of the following procedures: S Clutch Coil. S Clutch Plate and Hub Assembly. S Clutch Rotor and Bearing. S Component Locator V5 Compressor. S Control Valve Assembly. S Cylinder to Front Head ORing. S Leak Testing (External). S Pressure Relief Valve. S Rear Head, Gasket, Valve Plate, Reed Plate, and ORing. S Shaft Seal Replacement.

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7D 40IAUTOMATIC TEMPERATURE CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

GENERAL DESCRIPTION AND SYSTEM OPERATION
GENERAL INFORMATION THE V5 SYSTEM
Refer to Section 7B, Manual Control Heating, Ventilation, and Air Conditioning System,for general information details for the following: S S S S System Components Functional. The V5 A/C System. V5 Compressor Description of Operation. V5 Compressor General Description.

Eight Additional Push Knobs 1. Full defrost Causes the mode motors to direct all air to the windshield and aide window outlets for maximum defrosting. Air intake Switches between fresh air intake, the default, and recirculating air. Airflow arrows on the display indicate the mode in effect. Full Auto Switch Maintains the set temperature automatically. In this mode, the fully automatic temperature control (FATC) system controls the following: S S S S S 4. 5. The air mix door motor. The mode door motor. The blower motor speed. The inlet air door motor. A/C ON/OFF.

2.

3.

SYSTEM COMPONENTSCONTROL
Controller
The operation of the A/C system is controlled by the switches on the control head. This consolemounted heating and ventilation system contains the following knobs and display: Temperature Control Push Knobs 1. Raise the temperature of the air entering the vehicle by pressing the top switch, with the red arrow pointing upward. 2. Lower the temperature by pressing the bottom switch, with the blue arrow pointing downward. 3. Actuate the air mix door by an electric motor. 4. Vary the mix of the air passing through the heater core with the air bypassing the core. Each press of a switch changes the set temperature by increments of 0.5°C (1°F). This is shown in the temperature window on the function display. The Function Display This is an LCD display indicating the status of the control settings selected. Starting from the left end of the display, the sections are as follows: 1. 2. 3. 4. Temperature setting Indicates the temperature set with the temperature control knob. Auto status Indicates whether the system is operating in the full auto mode or the manual mode. Defroster icon Indicates manual selection of full defrost mode. Mode Indicated by icon, the mode chosen by the system in auto (or by the operator in manual) is shown by an illumination arrow indicating the air path. A/C A snowflake icon indicating whether the A/C is ON or OFF. Fan speed Indicates the fan speed by illuminating a bar based on the segment at the front, for low speed, and adding additional segments in order up to the fifth, for high speed.

OFF Switch Turns the automatic air conditioning and fan control off. Mode Switch Allows manual selection of the airflow direction. S S Selection is shown on the function display. Each time the mode switch is pressed, the next function is displayed.

6. 7. 8.

A/C Switch Allows manual selection and control of the air conditioning function. Fan Control Switch Allows manual selection among five fan speeds. Defogger Switch Turns on the electric defogging heater in the rear window and the outside rearview mirrors, if the vehicle is equipped with heated mirrors.

Pressure Transducer
Pressure transducer switching incorporates the functions of the highpressure and the lowpressure cutout switches along with the fan cycling switch. The pressure transducer is located in the highside liquid refrigerant line behind the right strut tower, between the right strut tower and the fire wall. The output from this pressure transducer goes to the electronic control module (ECM), which controls the compressor function based on the pressure signal.

WideOpen Throttle (WOT) Compressor Cutoff
During fullthrottle acceleration, the throttle position sensor (TPS) sends a signal to the ECM, which then controls the compressor clutch.

5. 6.

High RPM Cutoff
As engine rpm approaches the maximum limit, the ECM will disengage the compressor clutch until the engine slows to a lower rpm.

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