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- A/C compressor relay connector check.
- Check A/C compressor relay (Refer to GROUP 55 - On-vehicle Service - Relay Check ).
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Q.
Is the check result normal?
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Repair or replace the connector, or replace the A/C compressor relay.
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- Remove relay, and measure at the relay box side.
- Voltage between terminal power supply lines and body earth.
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Q.
Is the check result normal?
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Repair or replace the connector, or check and repair harness between A/C compressor relay connector terminal and battery.
- Check power supply line for open/short circuit.
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- Disconnect connector, and measure at the harness side.
- Voltage between terminal AC/R and body earth.
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Q.
Is the check result normal?
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Repair or replace the connector, or check and repair harness between engine-ECU connector terminal AC/R and A/C compressor relay connector terminal.
- Check earthing line for open/short circuit.
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- Disconnect connector, and measure at the harness side.
- Using a jumper wire, connect engine-ECU connector terminal AC/R and body earth.
- Voltage between terminal output line and body earth.
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Q.
Is the check result normal?
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- Check output line for open/short circuit.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire.
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- Check earthing line for damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or check and repair harness between A/C compressor relay connector terminal and battery.
- Check power supply line for damage.
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Repair or replace the connector, or repair the damaged harness wire.
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- Check power supply line for damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire.
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- Check output line for damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire.
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- Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
- Engine: Idle operation after warm-up
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- A/C set temperature:
Maximum Cool when temperature in cabin is 25°C or more Maximum Hot when temperature in cabin is 25°C or less
- Voltage between terminal AC/R and body earth.
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OK:
1.0 V or less (when A/C is ON) System voltage (when A/C is OFF)
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Q.
Is the check result normal?
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- Refer to Actuator Test Reference Table .
- Item 4: A/C compressor relay
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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Replace the A/C compressor relay.
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