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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 200 (DTCS P0016 To P0128, Intermittent Condition, Checking Exhaust System, Temperature Sensors, Power & Ground Circuits) >> P0072-Ambient Air Temperature Sensor Circuit Low (TIPM) >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1) AAT SENSOR VOLTAGE BELOW 0.078 OF A VOLT 

    Ignition on, engine not running.

    With a scan tool, read the AAT voltage.

    Is the voltage below 0.078 of a volt? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2) AAT SENSOR 

    Turn the ignition off.

    Disconnect the AAT harness connector.

    Ignition on, engine not running.

    With a scan tool, read AAT voltage.

    Is the voltage above 1.0 volt? 

    Yes 

    1. Replace the AAT Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (G31) AAT SIGNAL CIRCUIT SHORTED TO THE (G931) AAT RETURN CIRCUIT 
    Fig 1: Measuring Resistance Between The AAT Signal Circuit & AAT Return Circuit
    GC0041555Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C4 TIPM harness connectors.

    Measure the resistance between the (G931) AAT Return circuit and the (G31) AAT Signal circuit in the AAT Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to between the (G931) AAT Return circuit and the (G31) AAT Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (G31) AAT SIGNAL CIRCUIT SHORTED GROUND 
    Fig 2: Measuring Resistance Between Ground & AAT Signal Circuit
    GC0041554Courtesy of CHRYSLER LLC

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

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (G31) AAT Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  5).
  5. 5) TIPM 
    NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace and program the Totally Integrated Power Module in accordance with the Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
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