Heated Oxygen Sensor (Ho2S): MPV
- Warm engine to normal operating temperature. Turn ignition off. Disconnect suspect HO2S connector. Connect voltmeter to sensor terminals. See HO2S TERMINAL IDENTIFICATION (MPV)
table. Start engine. Raise engine speed to 3000 RPM until voltage varies between zero and one volt. Allow engine to idle. Accelerate engine several times. Voltage should be .5-1.0 volt when accelerating, 0-.5 volt when decelerating. If voltage is as specified, go to next step. If voltage is not as specified, replace sensor.
- Check for open or short on wiring between suspect HO2S and PCM. See
appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary.
- To test HO2S heating element, allow sensor to cool to room temperature. Disconnect HO2S connector. Using ohmmeter, measure resistance between specified terminals. See HO2S HEATER TERMINAL & RESISTANCE IDENTIFICATION (MPV)
table. If resistance is not as specified, replace HO2S.
HO2S TERMINAL IDENTIFICATION (MPV)
| Application |
Terminals |
| Left Front |
C (+), D (-) |
| Left Rear |
C (+), D (-) |
| Right Front |
A (+), B (-) |
| Right Rear |
A (+), B (-) |
| Middle |
C (+), D (-) |
| Rear |
C (+), D (-) |
HO2S HEATER TERMINAL & RESISTANCE IDENTIFICATION (MPV)
| Application |
Terminals |
Ohms |
| Left Front |
A & B |
5.0-6.8 |
| Right Front |
C & D |
5.0-6.8 |
| Middle |
A & B |
About 15.7 |
| Left Rear |
A & B |
14.2-18.8 |
| Right Rear |
C & D |
14.2-18.8 |
| Rear |
A & B |
About 15.7 |