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Home >> Jeep >> 2007 >> Compass Limited, AWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0032 To P0135 >> P0071-Ambient Air Temperature Sensor Performance >> Diagnostic Test

Diagnostic Test

  1. 1) DTC IS ACTIVE 
    NOTE: Diagnose any CAN - C Communication DTCs before continuing.

    Turn the ignition off.

    If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above - 7° C (19.4° F).

    Test drive the vehicle. The vehicle must exceed 48 km/h (30 mph) during the test drive. Do not cycle the ignition off when the test drive is completed.

    With a scan tool, select View DTCs.

    Is the status Active or Pending for this DTC? 

    Yes 

    1. Go to  3).

    No 

    1. Go to  2).
  2. 2) AMBIENT AIR TEMPERATURE 

    Turn the ignition off.

    Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and above - 7° C (19.4° F) until the engine coolant temperature is equal to ambient temperature.

    Turn the ignition on.

    With a scan tool, compare the AAT, ECT, and IAT sensor values.

    Is the Ambient Air Temperature Sensor value within 10° C (18° F) of the other two sensor values? 

    Yes 

    1. Refer to the *CHECKING FOR AN INTERMITTENT CONDITION Diagnostic Procedure.

    No 

    1. Go to  3).
  3. 3) (G31) AAT SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring Voltage Of (G31) AAT Signal Circuit In Ambient Air Temperature Sensor Harness Connector
    GC0054036Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Ambient Air Temperature Sensor connector.

    Disconnect the Totally Integrated Power Module (TIPM) connector.

    Turn the ignition on.

    Measure the voltage of the (G31) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the (G31) AAT Signal circuit for a short to voltage.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (G31) AAT SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking AAT Sensor Signal Circuit For Short To Ground
    GC0054037Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance between ground and the (G31) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector.

    Is the resistance above 100 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the (G31) AAT Signal circuit for a short to ground.
    2. Perform PCM VERIFICATION TEST .
  5. 5) (G31) AAT SIGNAL CIRCUIT SHORTED TO (G931) AAT SENSOR GROUND CIRCUIT 
    Fig 3: Checking AAT Sensor Signal Circuit For Short To Sensor Ground Circuit
    GC0054038Courtesy of CHRYSLER LLC

    Measure the resistance between the (G31) AAT Signal circuit and the (G931) AAT Sensor Ground circuit in the Ambient Air Temperature Sensor harness connector.

    Is the resistance above 100 ohms? 

    Yes 

    1. Go to  6).

    No 

    1. Repair the (G31) AAT Signal circuit for a short to the (G931) AAT Sensor Ground circuit.
    2. Perform PCM VERIFICATION TEST .
  6. 6) (G31) AAT SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking AAT Sensor Signal Circuit For Open Or High Resistance
    GC0054039Courtesy of CHRYSLER LLC

    Measure the resistance of the (G31) AAT Signal circuit between the Ambient Air Temperature Sensor harness connector and the Totally Integrated Power Module (TIPM) harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  7).

    No 

    1. Repair the (G31) AAT Signal circuit for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  7. 7) (G931) AAT SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 5: Checking AAT Sensor Ground Circuit For Open Or High Resistance
    GC0054040Courtesy of CHRYSLER LLC

    Measure the resistance of the (G931) AAT Sensor Ground circuit between the Ambient Air Temperature Sensor harness connector and the Totally Integrated Power Module (TIPM) harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  8).

    No 

    1. Repair the (G931) AAT Sensor Ground for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  8. 8) AMBIENT AIR TEMPERATURE SENSOR 
    Fig 6: Connecting Jumper Wire Between AAT Sensor Signal Circuit And Ground Circuit In AAT Sensor Harness Connector
    GC0054041Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Connect the Totally Integrated Power Module (TIPM) connector.

    Connect a jumper wire between the (G931) AAT Sensor Ground circuit and the (G31) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector.

    Turn the ignition on.

    With the scan tool, read the Ambient Air Temperature Sensor signal voltage.

    Is the voltage below 1.0 volt with the jumper wire in place? 

    Yes 

    1. Replace the Ambient Air Temperature Sensor in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  9).
  9. 9) TOTALLY INTEGRATED POWER MODULE (TIPM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ambient Air Temperature Sensor and the Totally Integrated Power Module (TIPM).

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

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

    Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.

    Look for the data to change or for the DTC to reset during the wiggle test.

    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 the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .
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