TEST
ACTION
APPLICABILITY
2
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Start the engine.
Disconnect the O2 Sensor harness connector.
With the DRBIII
t, monitor the O2 Sensor voltage.
Is the O2 Sensor voltage above 0.08?
All
Yes
→ Replace the O2 Sensor
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the O2 Sensor Signal circuit in the O2
Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the O2 Sensor Signal circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Sensor Signal circuit and the Sensor ground
circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the O2 Sensor Signal circuit for a short to the Sensor
ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Sensor Signal circuit and the Heater
control/ground circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the O2 Sensor Signal circuit for a short to the Heater
control/ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 6
6
NOTE: Before Continuing: Disconnect the PCM harness connector and
check the related wiring terminals for corrosion, damage or terminal push
out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
64
DRIVEABILITY - SBEC
P0131-1/1 O2 SENSOR SHORTED TO GROUND —
Continued