Inspection Procedure 7: The compressor does not work <4M40
A/T>
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COMMENTS ON TROUBLE SYMPTOM
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If the A/C compressor does not operate,
the A/C compressor circuit system may be defective.
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- Malfunction of A/C compressor
- Malfunction of A/C compressor relay
- Malfunction of A/C pressure sensor
- Damaged harness wires and connectors
- Malfunction of engine-A/T-ECU
- Malfunction of the A/C-ECU
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STEP 1. Connector check: B-43 engine coolant temperature switch and
B-22 A/C compressor assembly connector
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair
the connector.
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STEP 2. Voltage measurement at B-22 A/C compressor assembly
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 coolant temperature switch connector
B-43 and earth terminal 1.
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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 24.
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Go to Step 3.
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STEP 3. Connector check: B-16X A/C compressor relay
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.
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STEP 4. Check the A/C compressor relay continuity.
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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 5.
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Replace the A/C compressor
relay.
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STEP 5. Voltage measurement at B-16X A/C compressor relay
connector.
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(1)Remove the relay, and measure at the relay block
side.
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(2)Voltage between terminal 5 and body
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check the wiring harness between B-16X A/C compressor
relay connector terminal No.5 and the fusible link (1).
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Prior to the wiring harness inspection, check
intermediate connector A-05, and repair if necessary.
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- Check the A/C compressor relay power supply line for open
circuit.
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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 wiring harness.
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STEP 7. Voltage measurement at B-16X A/C compressor relay
connector.
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(1)Remove the relay, and measure at the relay block
side.
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(2)Turn the ignition switch to the "ON" position.
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(3)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 21.
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Go to Step 8.
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STEP 8. Connector check: D-249 timer controller connector
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Q.
Is the check result normal?
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Go to Step 9.
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Repair
the connector.
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STEP 9. Check the timer controller.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 10.
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Replace the timer controller.
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STEP 10. Check the wiring harness between B-16X A/C compressor
relay connector terminal No.5 and D-249 timer controller connector
terminal No.1.
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- Check the A/C compressor relay power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 11. Voltage measurement at D-249 timer controller
connector.
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(1)Remove the relay, and measure at the relay block
side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Voltage between terminal 6 and body
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 13.
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Go to Step 12.
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STEP 12. Check the wiring harness between D-249 timer controller
connector terminal No.6 and the ignition switch.
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| note |
Prior to the wiring harness inspection, check joint
connector D-113, intermediate connector D-230, junction block connector
D-401 and D-403, and repair if necessary.
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- Check the timer controller power supply line for open
circuit.
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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 wiring harness.
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STEP 13. Connector check: D-08 A/C-ECU connector
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Q.
Is the check result normal?
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Go to Step 14.
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Repair
the connector.
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STEP 14. Check the wiring harness between D-08 A/C-ECU connector
terminal No.13 and D-249 timer controller connector terminal
No.2.
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| note |
Prior to the wiring harness inspection, check
intermediate connector D-230, and repair if necessary.
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- Check the timer controller power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 15.
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Repair
the wiring harness.
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STEP 15. Resistance measurement at D-249 timer controller
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between terminal 4 and body
earth.
OK: 2Ω or less
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Q.
Is the check result normal?
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Go to Step 18.
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Go to Step 16.
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STEP 16. Connector check: D-14 earth connector
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Q.
Is the check result normal?
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Go to Step 17.
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Repair
the connector.
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STEP 17. Check the wiring harness between D-249 timer controller
connector terminal No.4 and D-14 earth connector terminal
No.1.
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- Check the timer controller earth line for open or short
circuit.
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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 wiring harness.
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STEP 18. Connector check: B-132 lever poaition switch
connector
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Q.
Is the check result normal?
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Go to Step 19.
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Repair
the connector.
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STEP 19. Check the lever poaition switch.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 20.
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Replace the lever position
switch.
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STEP 20. Check the wiring harness between D-249 timer controller
connector terminal No.7 and B-132 lever position switch connector terminal
No.1.
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- Check the timer controller earth line for open or short
circuit.
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Q.
Is the check result normal?
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Replace the A/C-ECU.
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Repair
the wiring harness.
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STEP 21. Check the wiring harness between B-16X A/C compressor
relay connector terminal No.4 and B-22 A/C compressor assembly
connector terminal No.1.
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- Check the A/C compressor power supply line for open
circuit.
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Q.
Is the check result normal?
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Go to Step 22.
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Repair
the wiring harness.
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STEP 22. Connector check: B-43 engine coolant temperature switch
connector
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Q.
Is the check result normal?
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Go to Step 23.
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Repair
the connector.
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STEP 23. Check the wiring harness between B-16X A/C compressor
relay connector terminal No.3 and B-43 engine coolant temperature switch
connector terminal No.1.
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- Check the A/C compressor relay earth line for open or short
circuit.
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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 wiring harness.
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STEP 24. Check the magnetic clutch operation.
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Refer to .
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Q.
Can the sound of the magnetic clutch (click) be heard?
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Go to Step 25.
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Replace the compressor magnet clutch.
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STEP 25. Check the engine coolant temperature switch.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 26.
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Replace the compressor magnet clutch.
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STEP 26. Remove the refrigerant, and fill it to the specified
amount.
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Remove the refrigerant and fill it to the
specified amount. Then check if the A/C operates normally. Refer to
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Q.
Is the check result normal?
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This
diagnosis is complete.
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Replace the A/C-ECU.
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