PROBLEM SYMPTOMS TABLE
| Symptom | Suspect Area | Action |
|---|---|---|
| Whole functions of the A/C system does not operate | A/C control assembly ACC power source circuit | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ACC Power Source Circuit |
| Air Flow Control: No blower operation | ACC power source circuit Heater main relay circuit Blower motor circuit A/C control assembly | ACC Power Source Circuit HEATER MAIN RELAY CIRCUIT Blower Motor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Air Flow Control: No blower control | Heater main relay circuit Blower motor circuit A/C control assembly Solar sensor circuit | HEATER MAIN RELAY CIRCUIT Blower Motor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE DTC B1421/21 Solar Sensor Circuit (Passenger Side) DTC B1424/24 Solar Sensor Circuit (Driver Side) |
| Air Flow Control: Insufficient air flow | Blower motor circuit | Blower Motor Circuit |
| Temperature Control: No cool air comes out | Refrigerant volume Drive belt tension Refrigeration system inspection with manifold gauge set Compressor circuit Pressure switch circuit Compressor lock sensor circuit Air mix damper position sensor circuit Air mix damper control servomotor circuit Room temp. sensor circuit Ambient temp. sensor circuit A/C control assembly | REFRIGERANT LINE DRIVE BELT AIR CONDITIONING SYSTEM Compressor Circuit DTC B1423/23 Pressure Switch Circuit DTC B1422/22 Compressor Lock Sensor Circuit DTC B1431/31 Air Mix Damper Position Sensor Circuit (Passenger Side), DTC B1441/41 Air Mix Damper Position Sensor Circuit (Passenger Side) DTC B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side) DTC B1411/11 Room Temperature Sensor Circuit DTC B1412/12 Ambient Temperature Sensor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Temperature Control: No warm air comes out | Air mix damper position sensor circuit Air mix damper control servomotor circuit Room temp. sensor circuit Ambient temp. sensor circuit Evaporator temp. sensor circuit A/C control assembly | DTC B1431/31 Air Mix Damper Position Sensor Circuit (Passenger Side), DTC B1441/41 Air Mix Damper Position Sensor Circuit (Passenger Side) DTC B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side) DTC B1411/11 Room Temperature Sensor Circuit DTC B1412/12 Ambient Temperature Sensor Circuit DTC B1413/13 Evaporator Temperature Sensor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Temperature Control: Output air is warmer or cooler that the set temperature or response is slow | Refrigerant volume Drive belt tension Refrigeration system inspection with manifold gauge set Cooling fan system Solar sensor circuit Room temp. sensor circuit Ambient temp. sensor circuit Evaporator temp. sensor circuit Air mix damper position sensor circuit Air mix damper control servomotor circuit Air inlet damper position sensor circuit Air inlet damper control servomotor circuit Condenser Evaporator Heater radiator Expansion valve A/C control assembly | REFRIGERANT LINE DRIVE BELT AIR CONDITIONING SYSTEM ELECTRIC COOLING FANS ELECTRIC COOLING FANS DTC B1421/21 Solar Sensor Circuit (Passenger Side) DTC B1424/24 Solar Sensor Circuit (Driver Side) DTC B1411/11 Room Temperature Sensor Circuit DTC B1412/12 Ambient Temperature Sensor Circuit DTC B1413/13 Evaporator Temperature Sensor Circuit DTC B1431/31 Air Mix Damper Position Sensor Circuit (Passenger Side), DTC B1441/41 Air Mix Damper Position Sensor Circuit (Passenger Side) DTC B1436/36 Air Mix Damper Position Sensor Circuit (Driver Side), DTC B1446/46 Air Mix Damper Position Sensor Circuit (Driver Side) DTC B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side) DTC B1446/46 Air Mix Damper Control Servomotor Circuit (Passenger Side) DTC B1432/32 Air Inlet Damper Position Sensor Circuit, DTC B1442/42 Air Inlet Damper Position Sensor Circuit DTC B1442/42 Air Inlet Damper Control Servomotor Circuit CONDENSER EVAPORATOR HEATER RADIATOR EXPANSION VALVE HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Temperature Control: No temperature control (only Max. cool or Max. warm) | Room temp. sensor circuit Ambient temp. sensor circuit Air mix damper position sensor circuit Air mix damper control servomotor circuit A/C control assembly | DTC B1411/11 Room Temperature Sensor Circuit DTC B1412/12 Ambient Temperature Sensor Circuit DTC B1431/31 Air Mix Damper Position Sensor Circuit (Passenger Side), DTC B1441/41 Air Mix Damper Position Sensor Circuit (Passenger Side) DTC B1441/41 Air Mix Damper Control Servomotor Circuit (Passenger Side) HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| No air inlet control | Air inlet damper position sensor circuit Air inlet damper control servomotor circuit A/C control assembly | DTC B1432/32 Air Inlet Damper Position Sensor Circuit, DTC B1442/42 Air Inlet Damper Position Sensor Circuit DTC B1442/42 Air Inlet Damper Control Servomotor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| No air flow mode | Air outlet damper position sensor circuit Air outlet damper control servomotor circuit A/C control assembly Exhaust gas sensor | DTC B1433/33 Air Outlet Damper Position Sensor Circuit, DTC B1443/43 Air Outlet Damper Position Sensor Circuit DTC B1443/43 Air Outlet Damper Control Servomotor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE DTC B1418/18 Exhaust Gas Sensor Circuit |
| Engine idle up does not occur, or is continuous | Compressor circuit A/C control assembly | Compressor Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Blinking of A/C indicator | Compressor circuit A/C control assembly | DTC B1421/21 Solar Sensor Circuit (Passenger Side) HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| Set temp. value displayed does not change up with operation of temp. control switch. | A/C control assembly | HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
| DTC not recorded. Set mode is cleared when IG switch is turned off. | Back-up power source circuit A/C control assembly | Back Up Power Source Circuit HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE |
PROBLEM SYMPTOMS