INSPECTION
PROCEDURE 1: Cool air does not come
|
If cool air does not exit from the air outlets when the blower switch is on with the engine
running, the A/C compressor and the A/C pressure sensor circuits may be defective.
|
|
- The refrigerant quantity is inadequate.
- Damaged harness wires and connectors
- Malfunction of the fin thermo sensor
- Engine-ECU malfunction
- Malfunction of the A/C pressure sensor
- Malfunction of the A/C compressor relay
- Malfunction of the A/C compressor and clutch
|
|
STEP 1. Check the refrigerant level.
|
|
Refer to .
|
|
Q.
Is the check result normal?
|
|
Go to Step 2.
|
|
|
|
Correct the refrigerant amount.
|
|
|
|
STEP 2. Check the fin thermo sensor.
|
|
Refer to .
|
|
Q.
Is the fin thermo sensor in good condition?
|
|
Go to Step 3.
|
|
|
|
Replace the fin thermo sensor.
|
|
|
|
STEP 3. Check open circuit in AC/T and ACYE line between fin
thermo sensor, temperature controller connector and engine-ECU connector.
|
|
Q.
Is the check result normal?
|
|
Go to Step 4.
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 4. Perform the simple inspection of the A/C pressure sensor.
|
|
Refer to .
|
|
Q.
Is the A/C pressure sensor in good condition?
|
|
Go to Step 5.
|
|
|
|
Replace the A/C pressure sensor.
|
|
|
|
STEP 5. Check open circuit in AC/P, BVSE&ACPE and BVS5&ACPS
line between A/C pressure sensor connector and engine-ECU connector.
|
|
Q.
Is the check result normal?
|
|
Go to Step 6.
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 6. Voltage measurement at A/C compressor and clutch
assembly and connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
(3)Disconnect engine-ECU connector and body earth.
|
|
(4)Voltage between terminal 1 and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 9.
|
|
|
|
Go to Step 7.
|
|
|
|
STEP 7. Check the A/C compressor.
|
|
Refer to .
|
|
Q.
Is the A/C compressor in good condition?
|
|
Go to Step 8.
|
|
|
|
Replace the A/C compressor.
|
|
|
|
STEP 8. Trouble symptom recheck.
|
|
Q.
Is the check result normal?
|
|
This diagnosis is complete.
|
|
|
|
Replace the engine-ECU.
|
|
|
|
STEP 9. Check the A/C compressor relay.
|
|
Refer to .
|
|
Q.
Is the A/C compressor relay in good condition?
|
|
Go to Step 10.
|
|
|
|
Replace the A/C compressor relay.
|
|
|
|
STEP 10. Voltage measurement at A/C compressor relay connector.
|
|
(1)Remove the relay and measure at the relay box side.
|
|
(2)Turn the ignition switch to the "ON" position.
|
|
(3)Voltage between terminal 1, 4 and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 12.
|
|
|
|
Go to Step 11.
|
|
|
|
STEP 11. Check open circuit in A/C compressor relay line between
ignition switch <Vehicles without one touch start system> or IG2 relay <Vehicles
with one touch start system>, fusible link (6), and A/C compressor relay connector.
|
|
note |
Before the wiring harness check, check the junction block connector and joint connector.
|
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 12. Check open circuit in AC/R line between A/C compressor
relay, A/C compressor and clutch assembly and engine-ECU connector.
|
|
note |
Before the wiring harness check, check the junction block connector and joint connector.
|
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|