Diagnostic Test

ACTIVE DTC
1. Start the engine and allow it to reach normal operating temperature.
  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.
  
  NOTE: Diagnose and repair any system voltage DTCs before continuing with this test.
2. With the scan tool, select View DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Perform the INTERMITTENT CONDITION Diagnostic Procedure. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
AAT SENSOR

Fig 1: Checking AAT Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the AAT Sensor harness connector.
3. Connect a jumper wire between the (G31) AAT signal circuit and the (G931) sensor ground circuit in the AAT sensor electrical connector.
4. Ignition on, engine not running.
5. With the scan tool, read AAT sensor voltage.
  NOTE: The sensor voltage should be approximately 0 Volt (plus or minus 0.1 volt) with the jumper wire in place.
  
  Does the scan tool display the voltage as described above?
  
  Yes
  - Verify there is good pin to terminal contact in the AAT sensor and Front Control Module (FCM) harness connectors. Replace the AAT sensor if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
    NOTE: Remove the jumper wire before continuing.
(G31) AAT SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 2: Measuring Voltage On (G31) AAT Signal Circuit In AAT Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C2 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 DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
(G31) AAT SIGNAL CIRCUIT OPEN

Fig 3: Measuring Resistance Of AAT Sensor Signal Circuit From AAT Sensor Harness Connector To C2 FCM Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance of the (G31) AAT signal circuit from the AAT sensor electrical connector to the FCM C2 electrical connector.
  Is the resistance less than 5.0 Ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the open in the (G31) AAT signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(G931) SENSOR GROUND CIRCUIT OPEN

Fig 4: Checking Sensor Ground Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (G931) Sensor Ground circuit from the AAT Sensor harness connector to the FCM C2 harness connector.
  Is the resistance less than 5.0 Ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the open in the (G931) AAT Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
FRONT CONTROL MODULE (FCM)
1. With the wiring diagram/schematic as a guide, inspect the wiring and connectors between the AAT Sensor and the FCM.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify there is good pin to terminal contact in the AAT Sensor and FCM connectors.
4. Refer to any Technical Service Bulletins (TSBs) that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .