FRONT A/C
| Symptom | Suspect Area | See |
|---|---|---|
| Whole does not operate | IG power source circuit A/C amplifier EMV | IG POWER SOURCE CIRCUIT TERMINALS OF ECU MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS |
| Air Flow Control: No blower operation | Heater main relay Blower motor circuit A/C amplifier Blower motor controller | HEATER MAIN RELAY BLOWER MOTOR CIRCUIT TERMINALS OF ECU BLOWER MOTOR CONTROL RELAY |
| Air Flow Control: No blower control | Blower motor circuit A/C amplifier Solar sensor circuit Blower motor controller | BLOWER MOTOR CIRCUIT TERMINALS OF ECU DTC 21 SOLAR SENSOR CIRCUIT BLOWER MOTOR CONTROL RELAY |
| Air Flow Control: Insufficient air flow | Blower motor circuit Blower motor controller | BLOWER MOTOR CIRCUIT BLOWER MOTOR CONTROL RELAY |
| Temperature Control: No cool air comes out | Refrigerant volume Drive belt tension Refrigeration system inspection with manifold gauge set Compressor circuit Pressure switch circuit Front air mix damper position sensor circuit Front air mix damper control servomotor circuit Front room temp. sensor circuit Ambient temp. sensor circuit A/C amplifier ECM | REPLACEMENT DRIVE BELT ON-VEHICLE INSPECTION COMPRESSOR MAGNETIC CLUTCH CIRCUIT DTC 23 PRESSURE SWITCH CIRCUIT DTC 31, 41 FRONT AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 41 FRONT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT DTC 11 FRONT ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT TERMINALS OF ECU TERMINALS OF ECM |
| Temperature Control: No warm air comes out | Front air mix damper position sensor circuit Front air mix damper control servomotor circuit Front room temp. sensor circuit Ambient temp. sensor circuit Front evaporator temp. sensor circuit A/C amplifier | DTC 31, 41 FRONT AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 41 FRONT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT DTC 11 FRONT ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT DTC 13 FRONT EVAPORATOR TEMPERATURE SENSOR CIRCUIT TERMINALS OF ECU |
| Temperature Control: Output air is warmer or cooler than the set temperature, or response is slow | Refrigerant volume Drive belt tension Refrigeration system inspection with manifold gauge set Solar sensor circuit Front room temp. sensor circuit Ambient temp. sensor circuit Front Evaporator temp. sensor circuit Front air mix damper position sensor circuit Front air mix damper control servomotor circuit Front air inlet damper position sensor circuit Front air inlet damper control servomotor circuit Condenser Evaporator Heater radiator Expansion valve A/C amplifier ECM | REPLACEMENT DRIVE BELT ON-VEHICLE INSPECTION DTC 21 SOLAR SENSOR CIRCUIT DTC 11 FRONT ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT DTC 13 FRONT EVAPORATOR TEMPERATURE SENSOR CIRCUIT DTC 31, 41 FRONT AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 41 FRONT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT DTC 32, 42 AIR INLET DAMPER POSITION SENSOR CIRCUIT DTC 42 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT CONDENSER FRONT A/C EVAPORATOR INSTALLATION FRONT COOLING UNIT TERMINALS OF ECU TERMINALS OF ECM |
| Temperature Control: No temperature control (only Max. cool or Max. warm) | Front room temp. sensor circuit Ambient temp. sensor circuit Front air mix damper position sensor circuit Front air mix damper control servomotor circuit A/C amplifier | DTC 11 FRONT ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT DTC 31, 41 FRONT AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 41 FRONT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT TERMINALS OF ECU |
| No air inlet control | Front air inlet damper position sensor circuit Front air inlet damper control servomotor circuit Exhaust gas sensor A/C amplifier | DTC 32, 42 AIR INLET DAMPER POSITION SENSOR CIRCUIT DTC 42 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT DTC 18 EXHAUST GAS SENSOR CIRCUIT (HC, CO) DTC 61 EXHAUST GAS SENSOR CIRCUIT (NOX) TERMINALS OF ECU |
| No air flow control | Air outlet damper position sensor circuit Air outlet damper control servomotor circuit A/C amplifier | AIR OUTLET SERVOMOTOR AIR OUTLET SERVOMOTOR TERMINALS OF ECU |
| Engine idle up does not occur, or is continuous | Compressor circuit ECM | COMPRESSOR MAGNETIC CLUTCH CIRCUIT TERMINALS OF ECM |
PROBLEM SYMPTOMS CHART
REAR A/C
| Symptom | Suspect Area | See |
|---|---|---|
| Whole functions does not operate | Rear A/C amplifier IG power source circuit | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE IG POWER SOURCE CIRCUIT |
| Air Flow Control: No blower operation | IG power source circuit Rear heater main relay Rear blower motor Rear blower resister Rear A/C amplifier | IG POWER SOURCE CIRCUIT REAR HEATER RELAY REAR HEATER UNIT - HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Air Flow Control: No blower control | Rear heater main relay Rear blower motor Rear blower resister Rear A/C amplifier Solar sensor circuit | REAR HEATER RELAY REAR HEATER UNIT - HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE DTC 21 SOLAR SENSOR CIRCUIT |
| Air Flow Control: Insufficient air flow | Rear blower motor Rear blower resister | REAR HEATER UNIT |
| Temperature Control: No cool air comes out | Refrigerant volume Drive belt tension Refrigeration system inspection with manifold gauge set Compressor circuit Pressure switch circuit Rear air mix damper position sensor circuit Rear air mix damper control servomotor circuit Rear room temp. sensor circuit Ambient temp. sensor circuit Rear A/C amplifier | REPLACEMENT DRIVE BELT ON-VEHICLE INSPECTION COMPRESSOR MAGNETIC CLUTCH CIRCUIT DTC 23 PRESSURE SWITCH CIRCUIT DTC 37, 47 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 47 REAR AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Temperature Control: No warm air comes out | Rear air mix damper position sensor circuit Rear air mix damper control servomotor circuit Rear room temp. sensor circuit Ambient temp. sensor circuit Rear evaporator temp. sensor circuit Rear A/C amplifier | DTC 37, 47 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 47 REAR AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT DTC 17 REAR EVAPORATOR TEMPERATURE SENSOR CIRCUIT HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow | Refrigerant volume Drive belt tension Refrigeration system inspection with manifold gauge set Solar sensor circuit Rear room temp. sensor circuit Ambient temp. sensor circuit Rear evaporator temp. sensor circuit Rear air mix damper position sensor circuit Rear air mix damper control servomotor circuit Condenser Evaporator Heater radiator Expansion valve Rear A/C amplifier | REPLACEMENT DRIVE BELT ON-VEHICLE INSPECTION DTC 21 SOLAR SENSOR CIRCUIT DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT DTC 17 REAR EVAPORATOR TEMPERATURE SENSOR CIRCUIT DTC 37, 47 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 47 REAR AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT CONDENSER REAR COOLING UNIT REAR HEATER UNIT REAR COOLING UNIT HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Temperature Control: No temperature control (only Max. cool or Max. warm) | Rear room temp. sensor circuit Ambient temp. sensor circuit Rear air mix damper position sensor circuit Rear air mix damper control servomotor circuit Rear A/C amplifier | DTC 19 REAR ROOM TEMPERATURE SENSOR CIRCUIT DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT DTC 37, 47 REAR AIR MIX DAMPER POSITION SENSOR CIRCUIT DTC 47 REAR AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
PROBLEM SYMPTOMS