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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) >> P0073-Ambient Air Temperature Sensor Circuit High (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 ABOVE 4.98 VOLTS 

    Ignition on, engine not running.

    With a scan tool, read the AAT voltage.

    Is the voltage above 4.98 volts? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2) AAT SENSOR 
    Fig 1: Checking AAT Sensor
    GC0041551Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the AAT harness connector.

    Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) AAT Return circuit in the AAT harness connector.

    Ignition on, engine not running.

    With a scan tool, read AAT voltage.

    Is the voltage below 1.0 volt with the jumper wire installed? 

    Yes 

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

    No 

    1. Go to  3).
      NOTE: Remove the jumper wire before continuing.
  3. 3) (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 2: Measuring Voltage At The AAT Signal Circuit
    GC0041550Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C4 TIPM harness connectors.

    Ignition on, engine not running.

    Measure the voltage on the (G31) AAT Signal circuit in the AAT Sensor harness connector.

    Is voltage present? 

    Yes 

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

    No 

    1. Go to  4).
  4. 4) (G31) AAT SIGNAL CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of The AAT Signal Circuit
    GC0041552Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance of the (G31) AAT Signal circuit between he AAT Sensor harness connector and C4 TIPM harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the open in the (G31) AAT Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5) (G931) AAT RETURN CIRCUIT OPEN  
    Fig 4: Measuring Resistance Of The AAT Return Circuit
    GC0041553Courtesy of CHRYSLER LLC

    Measure the resistance of the (G931) AAT Return circuit between the AAT Sensor harness connector and the C4 TIPM harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  6).

    No 

    1. Repair the open in the (G931) AAT Return circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6) 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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