Inspection
Procedure 6: The compressor does not work <4M40
M/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 11.
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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)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 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.1 and D-08 A/C-ECU
connector.
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Prior to the wiring harness inspection, check
intermediate connector D-230, 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)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 9.
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Go to Step 8.
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STEP 8. 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 9. Check the wiring harness between B-43 engine coolant
temperature
switch connector terminal No.1 and B-16X A/C compressor relay
connector terminal No.3.
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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 10.
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Repair
the wiring harness.
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STEP 10. 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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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 11. 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 12.
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Replace the compressor magnet clutch.
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STEP 12. 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 13.
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Replace the compressor magnet clutch.
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STEP 13. 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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