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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.4L Engine - DTCS P0016 To P0125, Diagnostic Code Index, Pre-Diagnostic Troubleshooting Procedure & Intermittent Condition >> Diagnosis And Testing >> P0073-Ambient Air Temperature Sensor Circuit High (TIPM)) >> Diagnostic Test

Diagnostic Test

  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 the INTERMITTENT CONDITION  Diagnostic Procedure.
    2. Perform (NGC) POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - NGC POWERTRAIN VERIFICATION TEST VER - 1) .
  2. 2)  AAT SENSOR 
    Fig 1: CHECKING AAT SENSOR
    GC0041551Courtesy of DAIMLERCHRYSLER CORP.

    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 the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - 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 DAIMLERCHRYSLER CORP.

    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 the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - 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 DAIMLERCHRYSLER CORP.

    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 the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  (G931) AAT RETURN CIRCUIT OPEN 
    Fig 4: MEASURING RESISTANCE OF THE AAT RETURN CIRCUIT
    GC0041553Courtesy of DAIMLERCHRYSLER CORP.

    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 the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - 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 the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace and program the Totally Integrated Power Module in accordance with the Service Information.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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