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TROUBLESHOOTING MULTIPOINT FUEL INJECTION (MPI) 13A-29 STEP 2. Perform voltage measurement at oxygen • 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 3. NO : Repair or replace the connector, or check and repair harness between oxygen sensor • Check power supply line for open/short circuit. STEP 3. Perform voltage measurement at • Disconnect connector, and measure at harness side. • Ignition switch: "ON" • Voltage between terminal OHFL and body earth. OK: System voltage Q: Is the check result normal? YES : Go to Step 4. NO : Repair or replace the connector, or check intermediate connector, and repair if • Check earthing line for open/short circuit. STEP 4. Check harness between oxygen sensor • Check earthing 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 oxygen sensor • Check power supply line for damage. Q: Is the check result normal? YES : Go to Step 6. NO : Repair or replace the connector, or repair STEP 6. M.U.T.-III diagnosis code • Reconfirmation of diagnosis code. Q: Is diagnosis code set? YES : Replace the engine-ECU. NO : Intermittent malfunction (Refer to GROUP − How to Use Troubleshooting/Inspection Service Points − How to Cope with Intermittent Malfunctions Code No. P0032: Oxygen Sensor (front) Heater Circuit High Input OPERATION • Power is supplied to the heater power terminal of the oxygen sensor (front) connector from the • The heater of the oxygen sensor (front) connec- tor terminal is controlled by the power transistor FUNCTION • The power supply to the oxygen sensor (front) heater is controlled by the ON/OFF control of the • Heating the oxygen sensor (front) heater enables the oxygen sensor (front) to provide good TROUBLE JUDGMENT Check Conditions • More than 2 seconds have passed since the engine starting sequence was completed. • While the oxygen sensor (front) heater is on. • Battery positive voltage is more than 11 V and is less than 16.5 V. |