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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MFI) 13A-103 OPERATION Power is supplied to the injector (terminal No. 1) The engine-ECU (terminal No. 15) makes the FUNCTION The engine-ECU controls the power supply inter- The fuel injection amount of the injector depends TROUBLE JUDGMENT Check Conditions The engine speed is 50 - 1,000 r/mim. The throttle position sensor output 1.15 V or less. Injector not in forced drive (actuator test) mode Judgment Criterion No surge voltage of the injector coil is detected PROBABLE CAUSE Failed No. 4 injector Open/short circuit in No. 4 injector circuit or loose Failed engine-ECU DIAGNOSIS PROCEDURE STEP 1. MUT-II actuator test Refer to Actuator test reference table list . a. Item 04: No. 4 injector OK: Idling state varies. Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO : Go to Step 2 . STEP 2. Connector check: B-05 No. 4 injector Q: Is the check result normal? YES : Go to Step 3 . NO : Repair. STEP 3. Measure resistance at B-05 No. 4 injector Disconnect connector, and measure at injector Resistance between terminal No. 1 and No. 2. OK: 10.5 - 13.5 W Q: Is the check result normal? YES : Go to Step 4 . NO : Replace No. 4 injector. AK300265 M 1 2 Harness side connector Connector: B-05 AF B-05 (GR) AK300265 M 1 2 Harness side connector Connector: B-05 AF B-05 (GR) |