Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
- Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Air conditioning system
PROBLEM SYMPTOMS CHART
| Symptom | Suspected area | See |
|---|---|---|
| No functions of A/C panel operate | 1. LIN communication line | - |
| 2. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 3. Air conditioning amplifier | TERMINALS OF ECU | |
| No functions of A/C system operate | 1. ECU-IG2 fuse | - |
| 2. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 3. Air conditioning amplifier | TERMINALS OF ECU | |
| 4. Wire harness or connector | - | |
| Airflow Control: No blower control (Blower motor does not operate) | 1. HTR fuse | - |
| 2. Blower motor circuit | BLOWER MOTOR CIRCUIT | |
| 3. Air conditioning amplifier | TERMINALS OF ECU | |
| 4. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 5. Wire harness or connector | - | |
| Airflow Control: No blower control (Blower motor does not change speed) | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT |
| 2. Air conditioning amplifier | TERMINALS OF ECU | |
| 3. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| Temperature Control: No cool air comes out | 1. Refrigerant volume | - |
| 2. Refrigerant pressure | - | |
| 3. Air conditioning pressure sensor | DTC B1423/23 PRESSURE SENSOR CIRCUIT | |
| 4. Compressor and pulley (for 2AZ-FE) | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| 5. Compressor and magnetic clutch (for 2GR-FE) | DTC B1451/51 COMPRESSOR SOLENOID CIRCUIT | |
| 6. Compressor circuit (for 2GR-FE) | COMPRESSOR CIRCUIT | |
| 7. Driver side air mix damper control servo motor circuit | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) | |
| 8. Passenger side air mix damper control servo motor circuit | 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. Expansion valve | - | |
| 13: Air conditioning amplifier | TERMINALS OF ECU | |
| 14. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 15. ECM (for 2AZ-FE) | SFI SYSTEM | |
| 16. ECM (for 2GR-FE) | SFI SYSTEM | |
| 17. LIN communication line | - | |
| 18. CAN communication system | CAN COMMUNICATION SYSTEM | |
| Temperature Control: No warm air comes out | 1. Driver side air mix damper control servo motor circuit | DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE) |
| 2. Passenger side air mix damper control servo motor circuit | DTC B1441/41 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (PASSENGER SIDE) | |
| 3. Air conditioning harness | - | |
| 4. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 5. Air conditioning amplifier | TERMINALS OF ECU | |
| 6. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 7. ECM (for 2AZ-FE) | SFI SYSTEM | |
| 8. ECM (for 2GR-FE) | SFI SYSTEM | |
| 9. LIN communication line | - | |
| 10. CAN communication system | CAN COMMUNICATION SYSTEM | |
| Temperature Control: Output air is warmer or cooler than set temperature or response is slow | 1. Driver side solar sensor circuit | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) |
| 2. Passenger side solar sensor circuit | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 3. Room temperature sensor circuit | DTC B1411/11 ROOM TEMPERATURE SENSOR CIRCUIT | |
| 4. Air inlet damper control servo motor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 5. Heater radiator | - | |
| 6. Expansion valve | - | |
| 7. Air conditioning amplifier | TERMINALS OF ECU | |
| 8. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 9. ECM (for 2AZ-FE) | SFI SYSTEM | |
| 10. ECM (for 2GR-FE) | SFI SYSTEM | |
| 11. LIN communication line | - | |
| 12. CAN communication system | CAN COMMUNICATION SYSTEM | |
| Temperature Control: No temperature control (Only Max. cool or Max. warm) | 1. Driver side solar sensor circuit | DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE) |
| 2. Passenger side solar sensor circuit | DTC B1421/21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | |
| 3. Air conditioning amplifier | TERMINALS OF ECU | |
| 4. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE | |
| 5. LIN communication line | - | |
| No air inlet control | 1. Air conditioning control assembly | AIR CONDITIONING CONTROL PANEL DOES NOT OPERATE |
| 2. Air inlet damper control servo motor circuit | DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT | |
| 3. Evaporator temperature sensor circuit | DTC B1413/13 EVAPORATOR TEMPERATURE SENSOR CIRCUIT | |
| 4. Air conditioning amplifier | TERMINALS OF ECU | |
| Engine idle up does not occur, or is continuos. | 1. Compressor circuit (for 2GR-FE) | COMPRESSOR CIRCUIT |
| 2. ECM (for 2AZ-FE) | SFI SYSTEM | |
| 3. ECM (for 2GR-FE) | SFI SYSTEM | |
| Diagnostic trouble codes are not recorded. Set mode is cleared when ignition switch turned to LOCK | 1. Air conditioning amplifier | TERMINALS OF ECU |
| 2. Back-up power source circuit | BACK-UP POWER SOURCE CIRCUIT |