[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P1603: Battery Backup Circuit Malfunction <Vehicles for Hong kong> | PRINT PAGE / INDEX / PRIOR / NEXT

Code No. P1603: Battery Backup Circuit Malfunction <Vehicles for Hong kong>
OPERATION Power is directly supplied to the engine-A/T-ECU (terminal No. 58) from the battery.
FUNCTION The engine-A/T-ECU is check the open circuit of battery backup line.
TROUBLE JUDGMENT Check Conditions After engine starting sequence is completed. Battery positive voltage is 10 V or higher. Ignition switch is "ON" position Judgment Criterion Battery backup line voltage is 6 V or lower for 2 seconds.
PROBABLE CAUSE Open/short circuit in battery backup line circuit or loose connector contact Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| STEP 1. MUT-II/III diagnosis code Temporarily place the ignition switch in "LOCK" (OFF) position, and 10 seconds after that, place it in "ON" position again. Q: Is the diagnosis code P1603 set? YES: Go to Step 2 . NO: Intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/Inspection Service Points ).
| STEP 2. Perform voltage measurement at C-135 engine-A/T-ECU connector.
| Disconnect connector, and measure at harness side. Ignition switch: ON Voltage between terminal No. 58 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 3 . NO: Check intermediate connector A-14, and repair if necessary. If intermediate connector is normal, check and repair harness between battery and C-135 (terminal No. 58) engine-A/T-ECU connector. Check power supply line for open/short circuit.
| STEP 3. Check harness between battery and C-135 (terminal No. 58) engine-A/T-ECU connector. NOTE: Before checking harness, check intermediate connector A-14, and repair if necessary.
| Check earthing line for damage. Q: Is the check result normal? YES: Go to Step 4 . NO: Repair.
| STEP 4. Connector check: C-135 engine-A/T-ECU connector.
| Q: Is the check result normal? YES: Go to Step 5 . NO: Repair.
| STEP 5. 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).

[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P1603: Battery Backup Circuit Malfunction <Vehicles for Hong kong> | PRINT PAGE / INDEX / PRIOR / NEXT

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