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HOMESERVICE MANUALSCHRYSLER2007ASPEN 4.7 P, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDTCS P0016 TO P0123P0037-O2 SENSOR 1/2 HEATER CIRCUIT LOWDIAGNOSTIC TEST
2007 Chrysler Aspen 4.7 P, RWD

Diagnostic Test

2007 Chrysler Aspen 4.7 P, RWDSECTION 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 DTC Active at this time? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) O2 HEATER ELEMENT 

    Turn the ignition off.

    NOTE: Allow the O2 Sensor to cool down to room temperature.

    Disconnect the 1/2 O2 Sensor harness connector.

    Measure the resistance across the O2 Sensor Heater element, between the O2 Heater Control terminal and the O2 Heater ground terminal at the component.

    NOTE: O2 Heater Element resistance values should be measured at 21.1° C (70° F). The resistance value will vary with different temperature values.

    Is the O2 Sensor Heater Element resistance between 2.0 and 30.0 ohms? 

    Yes 

    1. Go to  3).

    No 

    1. Replace the O2 Sensor. Refer to REMOVAL .
    2. Perform POWERTRAIN VERIFICATION TEST .
  3. 3) (K299) O2 1/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 1: Checking O2 Sensor Heater Control Circuit For Short To Ground
    GC0038437Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C3 PCM harness connector.

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to ground in the (K299) O2 1/2 Heater Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) EXCESSIVE RESISTANCE IN THE (K299) O2 1/2 HEATER CONTROL CIRCUIT 
    Fig 2: Checking 02 Heater Control Circuit For Open
    GC0038441Courtesy of CHRYSLER LLC
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.