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TROUBLESHOOTING MULTIPOINT FUEL INJECTION (MPI) 13A-69 YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions NO : Go to Step 2. STEP 2. Check No. 4 injector itself. • No. 4 Injector connector check. • Injector check (Refer to ). Q: Is the check result normal? YES : Go to Step 3. NO : Repair or replace the connector, or replace STEP 3. Perform voltage measurement at No. 4 • Disconnect connector, and measure at harness side. • Ignition switch: "ON" • Voltage between terminal power supply line and body earth. OK: System voltage Q: Is the check result normal? YES : Go to Step 5. NO : Go to Step 4. STEP 4. Check harness between engine control • Check power supply line for damage. Q: Is the check result normal? YES : Go to Step 5. NO : Repair or replace the connector, or repair STEP 5. Check harness between No. 4 injector • Check output line for open/short circuit and dam- age. Q: Is the check result normal? YES : Go to Step 6. NO : Repair or replace the connector, or repair STEP 6. Perform signal wave pattern • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness • Engine: Idling • Transmission: P range • Voltage between terminal INJ4 and body earth. OK: Waveforms should be displayed on Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions NO : Replace the engine-ECU. Code No. P0271: No. 4 Injector Circuit High Input OPERATION • Power is supplied to the injector connector termi- nal from the engine control relay connector termi- • The engine-ECU connector terminal INJ4 makes the power transistor in the unit be in ON position, FUNCTION • The engine-ECU controls the power supply inter- val of the injector. • The fuel injection amount of the injector depends on the power supply interval. TROUBLE JUDGMENT Check Condition • Engine is running. Judgement Criterion • The coil current is more than 4.5 A with the injec- tor driving. FAIL-SAFE AND BACKUP FUNCTION • None PROBABLE CAUSES • Failed No. 4 injector |