STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear) connector B-13 and connect test harness special tool MB991316 to the connector on the left bank heated oxygen sensor (rear) side.
(2) Warm up the engine until engine coolant temperature reaches 80°C (176°F) or higher.
(3) Drive at 50 km/h (31 mph) or more for 10 minutes.
(4) Connect a digital voltage meter between terminal ORLE line (black clip) and terminal O2RL line (white clip).
(5) Measure the output voltage of heated oxygen sensor under the following driving.- Transaxle: 2nd speed
- Drive with wide open throttle
- Engine: 3,500 r/min or more
Standard value: 0.6 - 1.0 V
note | If the temperature of sensing area does not reach the high temperature [of approximately 400°C (752°F) or more] even though the heated oxygen sensor is normal, the output voltage would be possibly low in spite of the rich air-fuel ratio. |
note | When the vehicle is driven with high loads, the temperature of the sensing area of the heated oxygen sensor is sufficiently high. Thus, it is not necessary to apply the voltage to the heater. |
Is the measured voltage between 0.6 and 1.0 volt?
Go to Step 3. Replace the left bank heated oxygen sensor (rear). Then go to Step 10.