TEST ACTION APPLICABILITY
5 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the O2 Signal circuit in the O2 Sensor
harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the short to ground in the O2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 6
6 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Signal circuit and the O2 Return circuit in
the O2 Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the O2 Return circuit shorted to the O2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 7
7 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Signal circuit and the Heater ground circuit
in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes → Repair the Heater Ground circuit shorted to the O2 Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 8
8 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
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-NGC.
94
DRIVEABILITY - NGC
P0131-O2 SENSOR 1/1 VOLTAGE LOW — Continued