STEP 1. Using scan tool (M.U.T.-IIISE), check data list item AD: Heated Oxygen Sensor (rear).
STEP 2. Measure the voltage at heated oxygen sensor (rear) connector.
(1) Disconnect the heated oxygen sensor (rear) connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal ORLE line and ground.- Voltage should be between 0.4 and 0.6 volt.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 0.4 and 0.6 volt?
Go to Step 4. Go to Step 3.
STEP 3. Check of open circuit and short circuit in ORLE line between heated oxygen sensor (rear) connector and ECM connector.
STEP 4. Check of harness damage in ORLE line between heated oxygen sensor (rear) connector and ECM connector.
STEP 5. Measure the sensor output voltage at heated oxygen sensor (rear) connector.
(1) Disconnect the heated oxygen sensor (rear) connector and connect test harness special tool MB991658 to the connector on the heated oxygen sensor (rear) side.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal O2RL line and ground.- Transaxle: 2nd
- Drive with wide open throttle
- Engine: 3,500 r/min or more
- The output voltage should be between 1.0 and 1.5 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage within the specified range?
Go to Step 8. Go to Step 6.
STEP 6. Check the heated oxygen sensor (rear).
STEP 7. Check of short circuit to ground in O2RL line between heated oxygen sensor (rear) connector and ECM connector.
STEP 8. Check of open circuit and harness damage to ground in O2RL line between heated oxygen sensor (rear) connector and ECM connector.
STEP 9. Using scan tool (M.U.T.-IIISE), check data list item AD: Heated Oxygen Sensor (rear).
STEP 10. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 2 . (2) Check the diagnostic trouble code (DTC).
Is DTC P0137 set?
Retry the troubleshooting. The inspection is complete.