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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4G1> 13B-213 OPERATION • A power voltage of 5 V is applied to the accelera- tor pedal position sensor (terminal No. 1) from the • The power voltage is earthed to the engine-ECU (terminal No. 84) from the accelerator pedal posi- • The sensor signal is inputted to the engine-ECU (terminal No. 83) from the accelerator pedal posi- FUNCTION • The accelerator pedal position sensor (main) out- puts voltage which corresponds to the accelera- • The engine-ECU checks whether the voltage is within a specified range. TROUBLE JUDGMENT Check Condition • Ignition switch is in ON position. Judgment Criterion • Accelerator pedal position sensor (main) output voltage is less than 0.2 V. PROBABLE CAUSE • Failed accelerator pedal position sensor • Open/short circuit in accelerator pedal position sensor circuit or loose connector contact • Failed engine-ECU DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III data list • Refer to Data List Reference Table . a. Item 78: Accelerator pedal position sensor (main) 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 : Go to Step 2 . STEP 2. Connector check: B-26 accelerator pedal Q: Is the check result normal? YES : Go to Step 3. NO : Repair or replace. STEP 3. Perform voltage measurement at B-26 • Disconnect connector, and measure at harness side. • Ignition switch: ON • Voltage between terminal No. 1 and earth. OK: 4.9 − 5.1 V Q: Is the check result normal? YES : Go to Step 7 . NO : Go to Step 4 . AK402092 1 6 5 4 3 2 B-26(B) AC Connector: B-26 Harness side AK402092 1 6 5 4 3 2 B-26(B) AC Connector: B-26 Harness side Main Index Group TOC |