Problem Symptoms Table
Check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
HINT:
Inspect the "Fuse" and "Relay" before inspecting the suspected area as shown in the table below.
Inspect each malfunction circuit in numerical order for the corresponding symptom.
If the malfunction still exists even after checking and confirming that all the circuits are normal, replace the A/C amplifier.
Air Conditioning System:
SUSPECTED AREA REFERENCE
| Symptom | Suspected Area | See page |
|---|---|---|
| Whole functions of the A/C system do not operate | 1. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY |
| 2. A/C amplifier assembly | TERMINALS OF ECU | |
| 3. Wire harness or connector | - | |
| Air Flow Control: No blower operation | 1. Blower w/ fan motor sub-assembly | BLOWER MOTOR |
| 2. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 3. A/C amplifier assembly | TERMINALS OF ECU | |
| 4. Wire harness or connector | - | |
| Air Flow Control: No blower control | 1. Blower w/ fan motor sub-assembly | BLOWER MOTOR |
| 2. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 3. A/C amplifier assembly | TERMINALS OF ECU | |
| 4. Wire harness or connector | - | |
| Air Flow Control: Insufficient air comes out | 1. Blower w/ fan motor sub-assembly | BLOWER MOTOR |
| 2. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 3. A/C amplifier assembly | TERMINALS OF ECU | |
| 4. Wire harness or connector | - | |
| Temperature Control: No cool air comes out | 1. Volume of refrigerant | REFRIGERANT |
| 2. Drive belt tension | DRIVE BELT | |
| 3. Refrigerant pressure | REFRIGERANT | |
| 4. Cooler compressor assembly | INSPECTION | |
| 5. Pressure switch | PRESSURE SWITCH | |
| 6. Air mix control servo motor | REMOVAL | |
| 7. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 8. A/C amplifier assembly | TERMINALS OF ECU | |
| 9. Wire harness or connector | - | |
| Temperature Control: No warm air comes out | 1. Engine coolant volume | COOLANT |
| 2. Air mix control servo motor | REMOVAL | |
| 3. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 4. Heater radiator unit sub-assembly | - | |
| 5. A/C amplifier assembly | TERMINALS OF ECU | |
| 6. Wire harness or connector | - | |
| Temperature Control: Output air is warmer or cooler than the set temperature or response is slow | 1. Heater control & accessory assembly | TERMINALS OF ECU |
| 2. Air mix control servo motor | REMOVAL | |
| 3. A/C amplifier assembly | ||
| Temperature Control: No temperature control | 1. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY |
| 2. Air mix control servo motor | REMOVAL | |
| 3. A/C amplifier assembly | ||
| No air inlet control | 1. Air inlet servo motor | AIR INLET CONTROL SERVO MOTOR |
| 2. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 3. A/C amplifier assembly | TERMINALS OF ECU | |
| 4. Wire harness or connector | - | |
| No air outlet control | 1. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY |
| 2. Air outlet control servo motor | AIR INLET CONTROL SERVO MOTOR | |
| 3. A/C amplifier assembly | TERMINALS OF ECU | |
| 4. Wire harness or connector | - | |
| Engine idle up does not occur, or is continuous | 1. Cooler compressor assembly | INSPECTION |
| 2. Heater control & accessory assembly | HEATER CONTROL ASSEMBLY | |
| 3. A/C amplifier assembly | ||
| Brightness does not change when rheostat volume or light control switch is turned | 1. Wire harness or connector | - |