[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 2: Communication with Engine-A/T-ECU only is not Possible. | PRINT PAGE / INDEX / PRIOR / NEXT

Inspection Procedure 2: Communication with Engine-A/T-ECU only is not Possible.
OPERATION There is data communication between diagnosis connector output terminal (terminal No. 7) and engine-A/T-ECU (terminal No. 85).
COMMENTS ON TROUBLE SYMPTOM Failure is possibly caused by failed power supply circuit or failed earthing circuit of engine-A/T-ECU.
PROBABLE CAUSE Open/short circuit in engine-A/T-ECU power circuit Short circuit in between engine-A/T-ECU and diagnosis connector circuit Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| 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 ).
| STEP 2: Connector check: C-110 engine-A/T-ECU connector
| Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
| 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. Check communication line for open/short circuit and damage. Q: Is the check result normal? YES: Go to Step 4 . NO: Repair.
| STEP 4: 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 ).

[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - SYMPTOM PROCEDURES - Inspection Procedure 2: Communication with Engine-A/T-ECU only is not Possible. | PRINT PAGE / INDEX / PRIOR / NEXT

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