Chrysler PT Cruiser 2001 Service Manual Supplement page 2531

P0131-1/1 O2 SENSOR SHORTED TO GROUND —
TEST
2 Turn the ignition on.
With the DRB, read O2 Sensor Signal voltage.
Disconnect the O2 Sensor harness connector.
Is the O2 Sensor signal voltage above 0.16 volts?
Yes → Check for miswiring in both harness connector and component
No
3 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between the O2 Sensor Signal circuit and the O2S Sensor
ground circuit at the O2S harness connector.
Is the resistance below 5.0 ohms?
Yes → Repair the O2 Sensor Signal circuit for a short to the O2 Sensor
No
4 Turn the ignition Off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between the O2 Sensor Signal circuit and engine ground.
Is the resistance below 5.0 ohms?
Yes → Repair the O2 Sensor Signal circuit for a short to ground.
No
5 If there are no possible causes remaining, view repair.
Repair
6 Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?
Yes → Repair wiring harness/connectors as necessary.
No
ACTION
connector, repair as necessary. If OK, replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 3
ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 4
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 5
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Test Complete.
DRIVEABILITY - GAS
Continued
71
APPLICABILITY
All
All
All
All
All