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Diagnostic Test

  1. 1) DTC IS ACTIVE 

    Start the engine and allow it to idle for at least 60 seconds.

    WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

    With a scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to *CHECKING FOR AN INTERMITTENT DTC .
  2. 2) 1/2 OXYGEN SENSOR 
    Fig 1: Checking Resistance Of O2 Sensor Heater Element
    GC0049368Courtesy of CHRYSLER LLC

    Turn the ignition off.

    NOTE: Allow the sensor to cool to ambient temperature before continuing. The voltage should stabilize between 4.6 and 5.0 volts.

    Disconnect the 1/2 Oxygen Sensor harness connector.

    Measure the resistance of the O2 sensor heater element across the 1/2 Oxygen Sensor connector between the heater control terminal and the ground terminal.

    NOTE: The resistance of the heater element will vary according to temperature and should be measured at 70° F (21.1° C).

    Is the resistance between 2.0 and 30.0 ohms? 

    Yes 

    1. Go to  3).

    No 

    1. Replace the 1/2 Oxygen Sensor in accordance with the Service Information.
    2. Perform *PCM VERIFICATION TEST .
  3. 3) (K299) O2 1/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking Resistance Of O2 Sensor Heater Element
    GC0049374Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Powertrain Control Module (PCM) connector.

    Measure the resistance between ground and the (K299) O2 1/2 Heater Control circuit in the 1/2 Oxygen Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the (K299) O2 1/2 Heater Control circuit for a short to ground.
    2. Perform *PCM VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (K299) O2 1/2 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 3: Checking Resistance Of O2 Sensor Heater Circuit
    GC0052644Courtesy of CHRYSLER LLC

    Turn the ignition off.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (K299) O2 1/2 Heater Control circuit between the 1/2 Oxygen Sensor harness connector and the appropriate terminal of special tool #8815.

    Is the resistance below 0.5 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the (K299) O2 1/2 Heater Control circuit for an open circuit or high resistance.
    2. Perform *PCM VERIFICATION TEST .
  5. 5) POWERTRAIN CONTROL MODULE (PCM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 1/2 Oxygen Sensor and the Powertrain Control Module (PCM).

    Look for any chafed, pierced, pinched, or partially broken wires.

    Look for broken, bent, pushed out or corroded terminals.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform *PCM VERIFICATION TEST .

    No 

    1. Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
    2. Perform *PCM VERIFICATION TEST .
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