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- Check battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).
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Q.
Is the check result normal?
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- Disconnect connector, and measure at harness side.
- Ignition switch: "ON"
- Voltage between terminal engine-ECU ALTL line and body earth.
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Q.
Is the check result normal?
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- Check power supply 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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Q.
Does the trouble symptom persist?
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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 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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- Disconnect connector, and measure at alternator side.
- Connect special tool Test Harness (MB991658) to all terminals except the terminal engine-ECU ALTG line.
- Ignition switch: "ON"
- Voltage between terminal engine-ECU ALTG line and body earth.
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Q.
Is the check result normal?
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- Check output line for 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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- 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
- Cooling fan: Not operated
- Voltage between terminal ALTG and body earth.
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OK: The voltage increases when the headlamp switch and the rear window defogger switch are turned "ON" from "OFF".
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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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