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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. 85).
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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
- Short circuit in between engine-A/T-ECU and diagnosis connector 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 23  ).
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| STEP 2: Connector check: C-110 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-110 (terminal No. 85) engine-A/T-ECU connector. NOTE: Before Checking harness, check intermediate connectors C-105 and C-02, and repair if necessary.
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- 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: 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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