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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (5.7L - DTCS P000B To P0159 - NGC - 3500 Cab & Chassis) >> Diagnosis and Testing >> P0071-Ambient Air Temperature Sensor Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    Diagnose any CAN - C Communication DTCs before continuing.

    1. Turn the ignition off.
    2. 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).
    3. 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.
    4. With a scan tool, select View DTCs.

      Is the DTC Active or Pending at this time?

      Yes 

      • Go To  3.

      No 

      • Go To  2.
  2. AMBIENT AIR TEMPERATURE 
    1. Turn the ignition off.
    2. 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.
    3. Turn the ignition on.
    4. 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 

      No 

      • Go To  3.
  3. AAT SENSOR VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the AAT Sensor harness connector.
    3. Ignition on, engine not running.
    4. With a scan tool, read the AAT voltage.
      NOTE:

      The sensor voltage should be approximately 5.0 volts (plus or minus.1 of a volt) with the connector disconnected.

      Does the scan tool display the voltage as described above?

      Yes 

      • Go To  4.

      No 

      • Go To  5.
  4. AAT SENSOR 
    Fig 1: Ambient Air Temperature Sensor Harness Connector
    GC0090641Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) Sensor Ground circuit in Ambient Air Temperature Sensor harness connector.
    3. Turn the ignition on.
    4. With a scan tool, read the Ambient Air Temperature Sensor voltage.
      NOTE:

      The sensor voltage should be approximately 0.0 volts (plus or minus.1 volt) with the jumper wire in place.

      Does the scan tool display the voltage as described above?

      Yes 

      • Verify that there is good pin to terminal contact in the Sensor and Control Module connectors. Replace the AAT Sensor if no problems were found in the connectors.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5.
        NOTE:

        Remove the jumper wire before continuing.

  5. (G31) AAT SIGNAL CIRCUIT HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Reconnect the AAT Sensor harness connector.
    3. Using a voltmeter perform a voltage drop test. Backprobe the (G31) AAT Signal circuit at the AAT sensor harness connector and the C4 TIPM harness connector.
    4. Start the engine and allow it to reach normal operating temperature.
    5. Monitor the voltmeter.

      Is the voltage less than 0.5 of a volt?

      Yes 

      • Go To  6.

      No 

      • Repair the excessive resistance in the (G31) AAT Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. (G931) SENSOR GROUND CIRCUIT HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Using a voltmeter perform a voltage drop test. Backprobe the (G931) Sensor Ground circuit at the AAT sensor harness connector and the C4 TIPM harness connector.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

    3. Start the engine and allow it to reach normal operating temperature.
    4. Monitor the voltmeter.

      Is the voltage less than 0.5 of a volt?

      Yes 

      • Go To  7.

      No 

      • Repair the excessive resistance in the (G930) AAT Return circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. (G31) AAT SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Measuring Voltage On AAT Signal Circuit In AAT Sensor Harness Connector
    GC0090642Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the C4 TIPM harness connector.
    3. Ignition on, engine not running.
    4. Measure the voltage on the (G31) AAT Signal circuit in the AAT Sensor harness connector.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage in the (G31) AAT Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8.
  8. (G31) AAT SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 3: Measuring Resistance Between Ground And AAT Sensor Signal Circuit In AAT Sensor Harness Connector
    GC0090643Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Measure the resistance between ground and the (G31) AAT Signal circuit in the AAT Sensor harness connector.

      Is the resistance less than 100 Ohms?

      Yes 

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

      No 

      • Go To  9.
  9. (G31) AAT SIGNAL CIRCUIT SHORTED TO THE (G931) SENSOR GROUND CIRCUIT 
    Fig 4: Measuring Resistance Between Sensor Return Circuit And Sensor Signal Circuit In AAT Sensor Harness Connector
    GC0090644Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (G930) AAT return circuit and the (G31) AAT Signal circuit in the AAT Sensor harness connector.

      Is the resistance less than 5.0 Ohms?

      Yes 

      • Repair the short between the (G930) AAT return circuit and the (G31) AAT Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10.
  10. TOTALLY INTEGRATED POWER MODULE 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the AAT Sensor and the Totally Integrated Power Module (TIPM).
    2. Look for any chafed, pierced, pinched, or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Sensor and Control Module connectors.
    4. Refer to any Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Replace the Totally Integrated Power Module in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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