Heated Oxygen Sensor: MPV
- Voltage Inspection
Warm engine to normal operating temperature. Turn ignition off. Disconnect suspect HO2S connector. Connect voltmeter to HO2S terminals. See HO2S TERMINAL IDENTIFICATION (MPV) table. Start engine. Raise engine speed to 3000 RPM until sensor voltage varies between zero and one volt. Allow engine to idle. Accelerate engine several times. Voltage reading should be .5-1.0 volt when accelerating, 0-.5 volt when decelerating. If HO2S sensor voltage reading is as specified but PID value or PCM voltages are not within specification, check for open or short circuit. Go to next step. If HO2S sensor voltage reading is not as specified, replace HO2S.HO2S TERMINAL IDENTIFICATION (MPV)Application Terminals Left Front A (+), B (-) Left Rear A (+), B (-) Right Front A (+), B (-) Right Rear A (+), B (-) - Open Circuit Inspection
Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between following terminals:- Right front HO2S harness connector terminal "A" and breakout box terminal No. 60 (Light Green/Red wire).
- Right front HO2S harness connector terminal "B" and breakout box terminal No. 91 (Brown/Yellow wire).
- Right rear HO2S harness connector terminal "A" and breakout box terminal No. 35 (Green wire).
- Right rear HO2S harness connector terminal "B" and breakout box terminal No. 91 (Blue/White wire).
- Left front HO2S harness connector terminal "A" and breakout box terminal No. 87 (White wire).
- Left front HO2S harness connector terminal "B" and breakout box terminal No. 91 (Brown/Yellow wire).
- Left rear HO2S harness connector terminal "A" and breakout box terminal No. 61 (Blue/White wire).
- Left rear HO2S harness connector terminal "B" and breakout box terminal No. 91 (Brown/Yellow wire).
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity between following terminals:- Right front HO2S harness connector terminal "A" (Light Green/Red wire) and ground.
- Right front HO2S harness connector terminal "A" (Light Green/Red wire) and power.
- Right front HO2S harness connector terminal "B" (Brown/Yellow wire) and power.
- Right rear HO2S harness connector terminal "A" (Green wire) and ground
- Right rear HO2S harness connector terminal "A" (Green wire) and power.
- Right rear HO2S harness connector terminal "B" (Brown/Yellow wire) and power.
- Left front HO2S harness connector terminal "A" (White wire) and ground.
- Left front HO2S harness connector terminal "A" (White wire) and power.
- Left front HO2S harness connector terminal "B" (Brown/Yellow wire) and power.
- Left rear HO2S harness connector terminal "A" (Blue/White wire) and ground.
- Left rear HO2S harness connector terminal "A" (Blue/White wire) and power.
- Left rear HO2S harness connector terminal "B" (Brown/Yellow wire) and power.
If continuity is not present, go to next step. If continuity is present, repair short circuit in suspect wire or replace wire harness.
- HO2S Heater Resistance Inspection
Allow sensor to cool to room temperature. Disconnect suspect HO2S connector. Using ohmmeter, measure resistance between HO2S connector terminals "C" and "D". Resistance reading should be 5.0-6.8 ohms (front HO2Ss) 14.1-18.9 ohms (rear HO2Ss). If resistance reading is not as specified, replace HO2S. If HO2S is okay but PID values are out of specification, check for open or short circuit. Go to next step. - Open Circuit Inspection
Check for continuity between following terminals:- Right front HO2S harness connector terminal "C" (Black/White wire) and power.
- Right front HO2S harness connector terminal "D" (Yellow wire) and breakout box terminal No. 93.
- Right rear HO2S harness connector terminal "C" (Black/White wire) and power.
- Right rear HO2S harness connector terminal "D" (Light Green wire) and breakout box terminal No. 95.
- Left front HO2S harness connector terminal "C" (Black/White wire) and power.
- Left front HO2S harness connector terminal "D" (Orange wire) and breakout box terminal No. 94.
- Left rear HO2S harness connector terminal "C" (Black/White wire) and power.
- Left rear HO2S harness connector terminal "D" (Green/Orange wire) and breakout box terminal No. 96.
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity between following:- Right front HO2S harness connector terminal "C" (Black/White wire) and ground.
- Right front HO2S harness connector terminal "D" (Yellow wire) and ground.
- Right front HO2S harness connector terminal "D" (Yellow wire) and power.
- Right rear HO2S harness connector terminal "C" (Black/White wire) and ground.
- Right rear HO2S harness connector terminal "D" (Light Green wire) and ground.
- Right rear HO2S harness connector terminal "D" (Light Green wire) and power.
- Left front HO2S harness connector terminal "C" (Black/White wire) and ground.
- Left front HO2S harness connector terminal "D" (Orange wire) and ground.
- Left front HO2S harness connector terminal "D" (Orange wire) and power.
- Left rear HO2S harness connector terminal "C" (Black/White wire) and ground.
- Left rear HO2S harness connector terminal "D" (Green/Orange wire) and ground.
- Left rear HO2S harness connector terminal "D" (Green/Orange wire) and power.
If continuity is present, repair short circuit in suspect wire or replace wire harness.