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Inspection Procedure
2: Communication with Engine-A/T-ECU Only is Not Possible.
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OPERATION
- There is data communication between diagnosis connector output terminal (terminal
No. 7) and engine-A/T-ECU (terminal No. 74).
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COMMENT ON TROUBLE SYMPTOM
- Failure is possibly caused by failed power supply circuit or failed earthing
circuit of engine-A/T-ECU.
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PROBABLE CAUSE
- Open/short circuit in engine-A/T-ECU power circuit
- Between engine-A/T-ECU and diagnosis connector for short circuit
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| STEP 1: Check engine warning lamp. - Ignition switch: OFF →
ON
Q: Is lamp illuminating for few seconds?
YES:
Go to Step 2  .
NO:
Check engine-A/T-ECU power supply, engine control relay and ignition switch IG1
system (Refer to Inspection Procedure 24  ).
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| STEP 2: Connector check: C-136 engine-A/T-ECU connector |
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Q: Is the check result normal?
YES:
Go to Step 3 .
NO:
Repair.
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| STEP 3: Check harness between C-24 (terminal No. 7) diagnosis connector
and C-136 (terminal No. 74) engine-A/T-ECU connector. |
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NOTE: Before Checking harness, check intermediate connectors C-02, C-04 and C-105 and repair
if necessary.
- Check communication line for open/short circuit and damage.
Q: Is the check result normal?
YES:
Go to Step 4 .
NO:
Repair.
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| STEP 4: Replace the combination meter - After replacing the combination meter, re-check the trouble symptoms.
Q: Is the check result normal?
YES:
Go to Step 5 .
NO:
Check end.
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| STEP 5: Check the trouble symptom. 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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