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- Data list reference table (Refer to ).
- Item AC: Oxygen sensor (front)
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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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- Disconnect connector, and measure at harness side.
- Ignition switch: "ON"
- Voltage between terminal engine-ECU OFLE line and body earth.
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Q.
Is the check result normal?
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- Check earthing 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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- Data list reference table (Refer to ).
- Item AC: Oxygen sensor (front)
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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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- 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 repair the damaged harness wire.
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- Use special tool test harness (MB991658) to connect connector, and measure at pick-up harness.
- Engine: After warm-up
- Transmission: P range
- Voltage between terminal engine-ECU O2FL line and earth.
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OK:
When the engine is 2,500 r/min, the output voltage should repeat 0.9 V or less <=> 1.1 to 1.5 V alternately.
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Q.
Is the check result normal?
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- Oxygen sensor check (Refer to ).
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Q.
Is the check result normal?
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Repair or replace the connector, or check intermediate connector, and repair if necessary. If intermediate connector is normal, check and repair harness between oxygen sensor (front) connector terminal and engine-ECU connector terminal O2FL.
- Check output line for short circuit.
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Replace oxygen sensor (front).
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- Check output line for open circuit and damage.
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Q.
Is the check result normal?
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Repair the damaged harness wire.
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