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- Disconnect connector, and measure at harness side.
- Ignition switch: "ON"
- Voltage between terminal engine-ECU ALTF line and body earth.
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Q.
Is the check result normal?
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- Check output line for open 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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- Reconfirmation of diagnosis code.
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Q.
Is diagnosis code stored?
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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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- Check output line for damage.
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Q.
Is the check result normal?
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Repair the damaged harness wire.
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- Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB992110) to measure at connector for inspection.
- Engine: Idle operation after warm-up
- Transmission: P range
- Radiator fan: Not operated
- Voltage between terminal ALTF and body earth.
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OK: Voltage decreases when the headlamps are extinguished → illuminated.
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Q.
Is the check result normal?
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