INSPECTION
PROCEDURE 1: Cool air does not come
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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.
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- 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
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STEP 1. Check the refrigerant level.
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Refer to  .
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Q.
Is the check result normal?
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 Go to Step 2.
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 Correct the refrigerant amount.
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STEP 2. Check the fin thermo sensor.
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Refer to .
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Q.
Is the fin thermo sensor in good condition?
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Go to Step 3.
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Replace the fin thermo sensor.
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STEP 3. Check open circuit in AC/T and ACYE line between fin
thermo sensor, temperature controller connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or wiring harness.
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STEP 4. Perform the simple inspection of the A/C pressure sensor.
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Refer to .
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Q.
Is the A/C pressure sensor in good condition?
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Go to Step 5.
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Replace the A/C pressure sensor.
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STEP 5. Check open circuit in AC/P, BVSE&ACPE and BVS5&ACPS
line between A/C pressure sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness.
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STEP 6. Voltage measurement at A/C compressor and clutch
assembly and connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Disconnect engine-ECU connector and body earth.
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(4)Voltage between terminal 1 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 7.
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STEP 7. Check the A/C compressor.
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Refer to .
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Q.
Is the A/C compressor in good condition?
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Go to Step 8.
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Replace the A/C compressor.
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STEP 8. Trouble symptom recheck.
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Q.
Is the check result normal?
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This diagnosis is complete.
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Replace the engine-ECU.
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STEP 9. Check the A/C compressor relay.
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Refer to .
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Q.
Is the A/C compressor relay in good condition?
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Go to Step 10.
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Replace the A/C compressor relay.
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STEP 10. Voltage measurement at A/C compressor relay connector.
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(1)Remove the relay and measure at the relay box side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Voltage between terminal 1, 4 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 12.
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Go to Step 11.
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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.
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Before the wiring harness check, check the junction block connector and joint connector.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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STEP 12. Check open circuit in AC/R line between A/C compressor
relay, A/C compressor and clutch assembly and engine-ECU connector.
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Before the wiring harness check, check the junction block connector and joint connector.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope
with Intermittent Malfunction ).
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Repair the connector(s) or wiring harness.
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