[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 16: Ignition Timing Offset | PRINT PAGE / INDEX / PRIOR / NEXT

Inspection Procedure 16: Ignition Timing Offset
COMMENT ON TROUBLE SYMPTOM Failure is possibly caused by failed crank angle sensor, failed camshaft position sensor, improper installed timing belt or other faults.
PROBABLE CAUSE Failed crank angle sensor Failed camshaft position sensor Improperly installed timing belt Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| STEP 1. MUT-II/III diagnosis code Q: Diagnosis code set? YES: Inspection chart for diagnosis code (Refer to ). NO: Go to Step 2 .
| STEP 2. Perform output wave pattern measurement of crank angle sensor and camshaft position sensor (Use oscilloscope).
| Crank Angle Sensor Use special tool test harness (MD998478) to connect B-29 crank angle sensor connector, and measure at pick-up harness. Engine: Idling Selector lever position: P 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. Engine: Idling Selector lever position: P Voltage between terminal No. 2 and earth. OK: Output wave pettern 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 .
| 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 ).
| 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.
| STEP 5. Check timing marks of timing belt. Q: Is the check result normal? YES: Go to Step 6 . NO: Align timing marks.
| STEP 6. Check crank angle sensor vane. Q: Is the check result normal? YES: Go to Step 7 . NO: Replace crank angle sensor vane.
| STEP 7. Check camshaft position sensing cylinder. Q: Is the check result normal? YES: Go to Step 8 . NO: Replace camshaft position sensing cylinder.
| 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.
| 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 ).

[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 16: Ignition Timing Offset | PRINT PAGE / INDEX / PRIOR / NEXT

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