Problem Symptoms Table

Symptom

Suspect Area

See page

Whole function does not operate

3. A/C amplifier

IN-41

4. IG power source circuit

DI-928

Air Flow Control: No blower operation

1. IG power source circuit

DI-928

2. Heater main relay circuit

DI-933

3. Blower motor circuit

DI-936

4. A/C amplifier

IN-41

Air Flow Control: No blower control

1. Heater main relay circuit

DI-933

2. Blower motor circuit

DI-936

3. A/C amplifier

IN-41

Air Flow Control: Insufficient air flow

1. Blower motor circuit

DI-936

Temperature Control: No cool air comes out

1. Refrigerant volume

AC-3

2. Drive belt tension

AC-15

3. Refrigeration system inspection with manifold gauge set

AC-3

4. Compressor circuit

DI-939

5. Pressure switch circuit

DI-906

6. Compressor lock sensor circuit

DI-903

7. Air mix damper position sensor circuit

DI-909

8. Air mix damper control servomotor circuit

DI-918

9. Room temperature sensor circuit

DI-886

10.Ambient temperature sensor circuit

DI-891

11 .A/C amplifier

IN-41

Temperature Control: No warm air comes out

1. Air mix damper position sensor circuit

DI-909

2. Air mix damper control servomotor circuit

DI-918

3. DC/DC converter circuit

DI-946

4. PTC heater circuit

DI-949,

DI-954

5. Room temperature sensor circuit

DI-888

6. Ambient temperature sensor circuit

DI-894

7. Evaporator temperature sensor circuit

DI-897

8. A/C amplifier

IN-41

Temperature Control: Output air is warmer or cooler than the set

1. Refrigerant volume

AC-3

temperature or response is slow

2. Drive belt tension

AC-15

3. Refrigeration system inspection with manifold gauge set

AC-3

4. Radiator fan and condenser fan circuit

DI-959

5. Solar sensor circuit

DI-900

6. Room temperature sensor circuit

DI-888

7. Ambient temperature sensor circuit

DI-891

8. Evaporator temperature sensor circuit

DI-897

9. Air mix damper position sensor circuit

DI-909

10.Air mix damper control servomotor circuit

DI-918

11 .Evaporator

AC-28

12.Heater radiator

AC-28

13.Expansion valve

AC-52

14.A/C amplifier

IN-41

Temperature Control: No temperature control (only Max. cool or

1. Room temperature sensor circuit

DI-888

Max. warm)

2. Ambient temperature sensor circuit

DI-894

3. Air mix damper position sensor circuit

DI-909

4. Air mix damper control servomotor circuit

DI-918

5. A/C amplifier

IN-41

No air inlet control

1. Air inlet damper position sensor circuit

DI-912

2. Air inlet damper control servomotor circuit

DI-921

3. A/C amplifier

IN-41

Engine idle up does not occur, or is continuous

1. Compressor circuit

2. A/C amplifier

DI-939 IN-41

Blinking of A/C indicator

1. Compressor lock sensor circuit

2. A/C amplifier

DI-903 IN-41

CIRCUIT INSPECTION

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