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Inspection Procedure
15: Knocking
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COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed detonation control, improper thermal
value of spark plug or other faults.
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PROBABLE CAUSE
- Defective detonation sensor
- Failed detonation control system
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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. Connector check: B-110 and B-111 ignition coil connectors |
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Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Repair.
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| STEP 3. Check ignition coil spark. Q: Is the check result normal?
YES:
Check detonation sensor (Refer to Code No. P0325 ).
NO:
Go to Step 4 .
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| STEP 4. Check spark plug. Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Replace spark plug.
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| STEP 5. Check spark plug cable itself. - Check spark plug cable itself (Refer to GROUP 16 -Ignition System -
On-vehicle
Service ).
Q: Is the check result normal?
YES:
Go to Step 6 .
NO:
Replace spark plug cable.
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| STEP 6. Check ignition coil itself. - Check ignition coil itself (Refer to GROUP 16 -
Ignition System -
On-vehicle
Service ).
Q: Is the check result normal?
YES:
Go to Step 7 .
NO:
Replace ignition coil.
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| STEP 7. Check harness between ignition coil connector terminal No.
2 of each cylinder and body earth. |
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- Check earthing line for open circuit or damage.
Q: Is the check result normal?
YES:
- Check and repair harness between ignition
coil connector terminal No. 3 of each cylinder and C-112 engine-A/T-ECU connector.
- Check signal line for open/short circuit and damage.
NO:
Repair.
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