Chrysler PT Cruiser 2001 Service Manual Supplement page 2540

DRIVEABILITY - GAS
P0135-1/1 O2 SENSOR HEATER FAILURE —
TEST
3 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the O2 Sensor Heater Control circuit from the O2 Sensor
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the O2 Sensor Heater Control circuit for an open.
No
4 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Sensor Heater Control circuit to ground at
the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes → Repair the Heater Control circuit for a short to ground.
→ Go To 5
No
5 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measurement is taken at the component side of connector.
Measure the resistance between the O2 Sensor Heater Feed circuit and the O2
Sensor Heater Control/Ground circuit.
Is the resistance between 3.0 and 7.0 ohms?
Yes → Go To 6
→ Replace the O2 Sensor.
No
6 If there are no possible causes remaining, view repair.
Repair
7 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.
→ Test Complete.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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