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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls - DTCS P0016 To P0121, Diagnostic Code Index, Pre Diagnostic Troubleshooting Procedure & Intermittent Condition) >> Electrical Diagnostics >> Diagnosis And Testing >> P0071-Ambient Air Temperature Sensor Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  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 step  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2)  AAT SENSOR VOLTAGE ABOVE 4.6 VOLTS 

    Turn the ignition off.

    Disconnect the AAT sensor harness connector.

    Ignition on, engine not running.

    With a scan tool, read the AAT voltage.

    Is the voltage above 4.6 volts? 

    Yes 

    1. Go To step  3).

    No 

    1. Go To step  4).
  3. 3)  AAT SENSOR 
    Fig 1: Checking Ambient Air Temperature Sensor Signal Circuit & Ground Circuit
    GC0014756Courtesy of DAIMLERCHRYSLER CORP.

    Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) Sensor ground 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 POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  4).
      NOTE: Remove the jumper wire before continuing.
  4. 4)  (G31) AAT SIGNAL CIRCUIT HIGH RESISTANCE 

    Turn the ignition off.

    Reconnect the AAT sensor harness connector.

    Using a voltmeter perform a voltage drop test. Backprobe the (G31) AAT Signal circuit at the AAT sensor harness connector and the FCM.

    WARNING: 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 can result in personal injury or death.

    Start the engine and allow it to reach normal operating temperature.

    Monitor the voltmeter.

    Is the voltage below 0.5 volts? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the high resistance in the (G31) AAT Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  (G931) SENSOR GROUND CIRCUIT HIGH RESISTANCE 

    Turn the ignition off.

    Reconnect the AAT sensor harness connector.

    Using a voltmeter perform a voltage drop test. Backprobe the (G931) Sensor ground circuit at the AAT sensor harness connector and the FCM.

    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 can result in personal injury or death.

    Start the engine and allow it to reach normal operating temperature.

    Monitor the voltmeter.

    Is the voltage below 0.5 volts? 

    Yes 

    1. Go To step  6).

    No 

    1. Repair the high resistance in the (G931) Sensor ground circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6)  FRONT CONTROL MODULE 
    NOTE: Before continuing, check the FCM 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 Front Control Module per Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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