Problem Symptoms Table
WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
If the normal code is displayed during DTC check although the problem still occurs, check the circuits for each problem symptom in the order given in PROBLEM SYMPTOMS TABLE , and proceed to the relevant troubleshooting.
PROBLEM SYMPTOMS TABLE
| Symptom | Suspect Area | Reference | |||
|---|---|---|---|---|---|
| Whole functions of the A/C system does not operate. | 1. IG power source circuit | IG POWER SOURCE CIRCUIT | |||
| 2. Heater control power supply circuit | HEATER CONTROL POWER SUPPLY CIRCUIT | ||||
| 3. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| Air Flow Control: No blower operation | 1. Heater relay circuit | HEATER RELAY CIRCUIT | |||
| 2. Blower motor circuit | BLOWER MOTOR CIRCUIT | ||||
| 3. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| Air Flow Control: No blower control | 1. Blower motor circuit | BLOWER MOTOR CIRCUIT | |||
| Temperature Control: No cool air comes out | 1. Volume of refrigerant | REFRIGERANT | |||
| 2. Drive belt tension | ENGINE (1GR-FE) | ||||
| 3. Refrigerant pressure | REFRIGERANT | ||||
| 4. Compressor lock sensor circuit | COMPRESSOR LOCK SENSOR CIRCUIT | ||||
| 5. Compressor circuit | COMPRESSOR CIRCUIT | ||||
| 6. Pressure switch circuit | PRESSURE SWITCH CIRCUIT | ||||
| 7. Air mix control servomotor circuit | (Driver side) ((1)) | DTC 46 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) | |||
| (Passenger side) | DTC 41 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) | ||||
| 8. Air mix damper position sensor circuit | (Driver side) ((1)) | AIR MIX DAMPER POSITION SENSOR CIRCUIT | |||
| (Passenger side) | DTC 31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | ||||
| 9. Room temp. sensor circuit | ROOM TEMP. SENSOR CIRCUIT | ||||
| 10. Ambient temp. sensor circuit | AMBIENT TEMP. SENSOR CIRCUIT | ||||
| 11. Vehicle speed signal circuit | VEHICLE SPEED SIGNAL CIRCUIT | ||||
| 12. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| Temperature Control: No warm air comes out | 1. Air mix control servomotor circuit | (Driver side) ((1)) | DTC 46 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) | ||
| (Passenger side) | DTC 41 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) | ||||
| 2. Air mix damper position sensor circuit | (Driver side) ((1)) | AIR MIX DAMPER POSITION SENSOR CIRCUIT | |||
| (Passenger side) | DTC 31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | ||||
| 3. Ambient temp. sensor circuit | AMBIENT TEMP. SENSOR CIRCUIT | ||||
| 4. Vehicle speed signal circuit | VEHICLE SPEED SIGNAL CIRCUIT | ||||
| 5. Room temp. sensor circuit | ROOM TEMP. SENSOR CIRCUIT | ||||
| 6. Evaporator temp. sensor circuit | EVAPORATOR TEMP. SENSOR CIRCUIT | ||||
| 7. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| 8. Heater radiator | - | ||||
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow. | 1. Room temp. sensor circuit | ROOM TEMP. SENSOR CIRCUIT | |||
| 2. Ambient temp. sensor circuit | AMBIENT TEMP. SENSOR CIRCUIT | ||||
| 3. Vehicle speed signal circuit | VEHICLE SPEED SIGNAL CIRCUIT | ||||
| 4. Solar sensor circuit | (Driver side) ((1)) | SOLAR SENSOR CIRCUIT | |||
| (Passenger side) | DTC 21 SOLAR SENSOR CIRCUIT (PASSENGER SIDE) | ||||
| 5. Air mix damper position sensor circuit | (Driver side) ((1)) | DTC 46 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) | |||
| (Passenger side) | DTC 41 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) | ||||
| 6. Air mix control servomotor circuit | (Driver side) ((1)) | AIR MIX CONTROL SERVOMOTOR CIRCUIT | |||
| (Passenger side) | DTC 31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | ||||
| 7. Engine coolant temperature communication circuit | ENGINE COOLANT TEMPERATURE COMMUNICATION CIRCUIT | ||||
| 8. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| Temperature Control: No temperature control (only Max. cool or Max. warm) | 1. Air mix control servomotor circuit | (Driver side) (* 1) | DTC 46 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) | ||
| (Passenger side) | DTC 41 AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) | ||||
| 2. Air mix damper position sensor circuit | (Driver side) (* 1) | AIR MIX DAMPER POSITION SENSOR CIRCUIT | |||
| (Passenger side) | DTC 31 AIR MIX DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) | ||||
| 3. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| No air inlet control | 1. Air inlet damper control servomotor circuit | AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT | |||
| 2. Air inlet damper position sensor circuit | AIR INLET DAMPER POSITION SENSOR CIRCUIT | ||||
| 3. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| No air outlet control | 1. Air outlet damper position sensor circuit | AIR OUTLET DAMPER POSITION SENSOR CIRCUIT | |||
| 2. Air outlet control servomotor circuit | AIR OUTLET CONTROL SERVOMOTOR CIRCUIT | ||||
| 3. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| Engine idle up does not occur, or is continuous | 1. Compressor circuit | COMPRESSOR CIRCUIT | |||
| 2. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | ||||
| Set temperature value displayed does not much up with operation of temperature control switch. | 1. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | |||
| Brightness does not changes when rheostat volume or light control switch it turned. | 1. Illumination light system | - | |||
| 2. Heater control panel | - | ||||
| Unable to access the diagnosis mode. | 1. Heater control panel communication circuit | HEATER CONTROL PANEL COMMUNICATION CIRCUIT | |||
| DTC not recorded. Set mode is cleared when IG switch is turned off. | 1. Back-up power source circuit | BACK-UP POWER SOURCE CIRCUIT | |||
| 2. A/C amplifier | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | ||||
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