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Inspection Procedure
16: Ignition Timing Offset
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COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed crank angle sensor, failed camshaft
position sensor, improper installed timing belt or other faults.
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PROBABLE CAUSE
- Failed crank angle sensor
- Failed camshaft position sensor
- Improperly installed timing belt
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| STEP 1. MUT-II/III diagnosis code Q: Diagnosis code set?
YES:
Inspection chart for diagnosis code (Refer to  ).
NO:
Go to Step 2  .
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| STEP 2. Measure output waveforms of crank angle sensor and camshaft
position sensor (Use oscilloscope). |
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Crank Angle Sensor
- Use special tool test harness (MB991658) to connect B-29 crank angle sensor intermediate
connector, and measure at pick-up harness.
- Voltage between terminal No. 2 and earth.
Camshaft Position Sensor
- Use special tool test harness (MB991709) to connect B-106 camshaft position sensor
connector, and measure at pick-up harness.
- Voltage between terminal No. 2 and earth.
OK: Output waveform timings of both sensors are the same as the check procedure
(Refer to ) using an oscilloscope.
Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Go to Step 4 .
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| STEP 3. Check the trouble symptoms. Q: Does trouble symptom persist?
YES:
Replace engine-A/T-ECU.
NO:
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points ).
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| STEP 4. Check crank angle sensor and camshaft position sensor mounted
conditions. Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Repair.
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| STEP 5. Check timing marks of timing belt. Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Align timing marks.
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| STEP 6. Check crank shaft sensing blead. Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Replace crank shaft sensing blead.
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| STEP 7. Check camshaft position sensing cylinder. Q: Is the check result normal?
YES:
Go to Step 8 .
NO:
Replace camshaft position sensing cylinder.
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| STEP 8. Replace crank angle sensor. - After replacing the crank angle sensor, re-check the trouble symptoms.
Q: Does trouble symptom persist?
YES:
Go to Step 9 .
NO:
Check end.
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| STEP 9. Replace camshaft position sensor. - After replacing the camshaft position sensor, re-check the trouble symptoms.
Q: Does trouble symptom persist?
YES:
Replace engine-A/T-ECU.
NO:
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points ).
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