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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 >> P0071-Ambient Air Temperature Sensor Performance >> Diagnostic Test

Diagnostic Test

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

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION  Diagnostic Procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE  
    Fig 1: MEASURING VOLTAGE AT THE AAT SIGNAL CIRCUIT
    GC0041550Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C4 TIPM harness connector.

    Disconnect the AAT Sensor harness connector.

    NOTE: Visually inspect both the component and the TIPM connectors. Look for damaged, partially broken wires, and backed out or corroded terminals.

    Ignition on, engine not running.

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

    Is the voltage above 5.2 volts? 

    Yes 

    1. Repair the short to 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  3).
  3. 3)  AAT SENSOR VOLTAGE ABOVE 4.6 VOLTS 

    Turn the ignition off.

    Connect the C4 TIPM harness connectors.

    Ignition on, engine not running.

    With a scan tool, read the AAT voltage.

    Is the voltage above 4.6 volts? 

    Yes 

    1. Go To  4).

    No 

    1. Go To  7).
  4. 4)  AAT SENSOR 
    Fig 2: CHECKING AAT SENSOR
    GC0041551Courtesy of DAIMLERCHRYSLER CORP.

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

    With a scan tool, read the 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  5).
      NOTE: Remove the jumper wire before continuing.
  5. 5)  (G31) AAT SIGNAL CIRCUIT OPEN 
    Fig 3: MEASURING RESISTANCE OF THE AAT SIGNAL CIRCUIT
    GC0041552Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C4 TIPM harness connector.

    Measure the resistance of the (G31) AAT Signal circuit from the AAT Sensor harness connector to the C4 TIPM harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  6).

    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) .
  6. 6)  (G931) AAT RETURN CIRCUIT OPEN  
    Fig 4: MEASURING RESISTANCE OF THE AAT SIGNAL CIRCUIT
    GC0041553Courtesy of DAIMLERCHRYSLER CORP.

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  9).

    No 

    1. Repair the open in the (G931) Sensor ground circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  7. 7)  (G31) AAT SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: MEASURING RESISTANCE BETWEEN GROUND AND AAT SIGNAL CIRCUIT
    GC0041554Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C4 TIPM harness connector.

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

    No 

    1. Go To  8).
  8. 8)  (G31) AAT SIGNAL SHORTED TO THE (G931) AAT RETURN CIRCUIT 
    Fig 6: MEASURING RESISTANCE BETWEEN THE AAT SIGNAL CIRCUIT AND AAT RETURN CIRCUIT
    GC0041555Courtesy of DAIMLERCHRYSLER CORP.

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

    Is the resistance below 5.0 ohms? 

    Yes 

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

    No 

    1. Go To  9).
  9. 9)  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 BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Totally Integrated Power Module in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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