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Q.
Is the check result normal?
Go to Step 2 .
Repair or replace the connector.
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- Use special tool harness (MB991709) to connect connector, and
measure at pick-up harness.
- Ignition switch: ON
- Voltage between terminal No. 2 and earth.
OK: 4.9 - 5.1V
Q.
Is the check result normal?
Go to Step 8 .
Go to Step 3 .
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- Measure engine-ECU terminal voltage.
- Disconnect A-43 camshaft position sensor connector.
- Ignition switch: ON
- Voltage between terminal No. 57 and earth.
OK: 4.9 - 5.1V
Q.
Is the check result normal?
Go to Step 4 .
Go to Step 5 .
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Q.
Is the check result normal?
Check intermediate connector A-131, and repair
if necessary. If intermediate connector is normal, check and repair harness between A-43 (terminal No.
2) camshaft sensor connector and C-105 (terminal No. 57) engine-ECU connector.
- Check output line for open circuit and damage.
Repair or replace the connector.
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Q.
Is the check result normal?
Go to Step 6 .
Repair or replace the connector.
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note |
Before checking harness, check intermediate connector A-131, and repair if necessary.
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- Check output line for short circuit.
Q.
Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire.
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- Reconfirmation of diagnosis code.
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Q.
Is the diagnosis code set?
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Replace the engine-ECU. When the engine-ECU is replaced, write the chassis number
(Refer to GROUP 00 - How to Perform Chassis Number Writing ).
After replacing the engine-ECU, register the injector identification code and learn fuel injection (Refer
to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns ).
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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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- Use special tool harness (MB991709) to connect connector, and
measure at pick-up harness.
- Ignition switch: ON
- Voltage between terminal No. 3 and earth.
OK: 4.9 - 5.1V
Q.
Is the check result normal?
Go to Step 11 .
Go to Step 9 .
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Q.
Is the check result normal?
Go to Step 10 .
Repair or replace the connector.
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note |
Before checking harness, check intermediate connector A-131, and repair if necessary.
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- Check power supply line for short circuit and damage.
Q.
Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire.
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- Disconnect connector, and measure at harness side.
- Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)
Q.
Is the check result normal?
Go to Step 14 .
Go to Step 12 .
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Q.
Is the check result normal?
Go to Step 13 .
Repair or replace the connector.
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note |
Before checking harness, check intermediate connector A-131, and repair if necessary.
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- Check earthing line for open circuit and damage.
Q.
Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire.
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- Use special tool test harness (MB991709) to connect connector,
and measure at pick-up harness.
- Engine: Idling
- Transmission: Neutral (A/T: P range)
- Voltage between terminal No. 2 and earth.
OK: Waveforms should be displayed on Inspection procedure using an oscilloscope
(Refer to ), its maximum value should be 4.8 V or more, and
its minimum valve should be 0.6 V or less with no noise in waveform.
Q.
Is the check result normal?
Go to Step 7 .
Replace the camshaft position sensor.
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