Problem Symptoms Table
AIR CONDITIONER:
AIR CONDITIONER PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| All functions of the A/C system do not operate | 1. IG power source circuit | IG POWER SOURCE CIRCUIT |
| 2. Back-up power source circuit | BACK-UP POWER SOURCE CIRCUIT | |
| 3. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 4. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 5. A/C control assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| 6. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Air Flow Control: No blower operation | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 3. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 4. A/C control assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| 5. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Air Flow Control: No blower control | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 3. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 4. A/C control assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| 5. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Air Flow Control: Insufficient air flow | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Temperature Control: No cool air comes out | 1. Refrigerant volume | REFRIGERANT |
| 2. Refrigerant pressure | REFRIGERANT | |
| 3. Pressure sensor circuit | DTC B1423/23 PRESSURE SENSOR CIRCUIT | |
| 4. Air conditioning compressor magnetic clutch circuit | AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT | |
| 5. Compressor lock sensor circuit | DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT | |
| 6. Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| 7. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 8. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 9. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 10. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 11. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 12. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 13. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 14. Expansion valve | DISASSEMBLY | |
| 15. A/C control assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| 16. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| 17. ECM | REMOVAL | |
| Temperature Control: No warm air comes out | 1. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) |
| 2. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 3. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 6. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow | 1. Refrigerant volume | REFRIGERANT |
| 2. Refrigerant pressure | REFRIGERANT | |
| 3. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 4. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 5. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 6. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 7. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 8. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 9. Radiator unit sub-assembly | DISASSEMBLY | |
| 10. Expansion valve | DISASSEMBLY | |
| 11. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Temperature Control: No temperature control (only Max. cool or Max. warm) | 1. Air mix control servo motor circuit (Driver side) | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) |
| 2. Air mix control servo motor circuit (Passenger side) | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 3. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 4. Ambient temperature sensor circuit | DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT | |
| 5. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 6. Solar sensor circuit (Driver side) | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) | |
| 7. Solar sensor circuit (Passenger side) | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 8. A/C control assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| 9. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| No air inlet control | 1. Air inlet control servo motor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| No air flow mode control | 1. Air outlet control servo motor circuit | DTC B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Engine idle up does not occur, or is continuous | 1. Air conditioning compressor magnetic clutch circuit | AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT |
| 2. Compressor lock sensor circuit | DTC B1422/22 COMPRESSOR LOCK SENSOR CIRCUIT | |
| 3. Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| 4. Heater control panel power source circuit | HEATER CONTROL PANEL POWER SOURCE CIRCUIT | |
| 5. LIN communication circuit | LIN COMMUNICATION CIRCUIT | |
| 6. A/C control assembly | AIR CONDITIONING CONTROL ASSEMBLY | |
| 7. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| 8. ECM | REMOVAL | |
| Blinking of A/C indicator | 1. Compressor solenoid circuit | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER | |
| Diagnostic trouble codes are not recorded. Set mode is cleared when engine switch is turned off. | 1. Back-up power source circuit | BACK-UP POWER SOURCE CIRCUIT |
| 2. A/C amplifier | AIR CONDITIONING AMPLIFIER |