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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1.6L Engine - DTCS P0132 To P0302 >> Diagnosis And Testing >> P0139-1/2 O2 Sensor Slow Response >> Diagnostic Test

Diagnostic Test

  1. 1)  GOOD TRIP INDICATED 
    NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.

    Turn the ignition on.

    With the scan tool, read DTCs.

    Does the Good Trip Indicator display NO? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  EXHAUST LEAK 

    Start the engine.

    Inspect the exhaust system for leaks between the engine and the O2 sensors.

    Are there any exhaust leaks? 

    Yes 

    1. Repair or replace the leaking exhaust parts as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP 
    NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal to wire connection.
    NOTE: Ensure the voltmeter leads are connected for positive polarity

    Perform a voltage drop test by backprobing the O2 Sensor Signal circuit at the O2 Sensor harness connector and at the PCM harness connector.

    Start the engine.

    Allow the engine to idle.

    Is the voltage below 0.10 volt? 

    Yes 

    1. Go To  4).

    No 

    1. Repair the high resistance on the O2 Sensor Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  4. 4)  O2 SENSOR GROUND CIRCUIT VOLTAGE DROP 
    NOTE: Ensure the voltmeter leads meet the terminals in the connector and that there is good terminal to wire connection.
    NOTE: Ensure the voltmeter leads are connected for positive polarity

    Backprobe the O2 Sensor ground circuit between the O2 Sensor harness connector and PCM harness connector.

    Start the engine.

    Allow the engine to idle.

    Is the voltage below 0.10 volt? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the high resistance on the O2 Sensor ground circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  O2 SENSOR 

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace the O2 Sensor
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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