Diagnostic Test

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

NOTE: Diagnose and repair any system voltage DTCs before continuing with this test.

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 can result in personal injury or death.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes
1. Go to 2).
No
1. Refer to the *CHECKING FOR AN INTERMITTENT CONDITION Diagnostic Procedure.
2) (G31) AAT SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Of (G31) AAT Signal Circuit In Ambient Air Temperature Sensor Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Ambient Air Temperature Sensor connector.

Disconnect the Powertrain Control Module (PCM) connector.

Turn the ignition on.

Measure the voltage of the (G31) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector.

Is there any voltage present?

Yes
1. Repair the (G31) AAT Signal circuit for a short to voltage.
2. Perform PCM VERIFICATION TEST .
No
1. Go to 3).
3) (G31) AAT SIGNAL OPEN OR HIGH RESISTANCE

Fig 2: Checking AAT Sensor Signal Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC

Turn the ignition off.

Measure the resistance of the (G31) AAT Signal circuit between the Ambient Air Temperature Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 4).
No
1. Repair the (G31) AAT Signal circuit for an open circuit or high resistance.
2. Perform PCM VERIFICATION TEST .
4) (G931) AAT SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking AAT Sensor Ground Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC

Measure the resistance of the (G931) AAT Sensor Ground circuit between the Ambient Air Temperature Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go to 5).
No
1. Repair the (G931) AAT Sensor Ground circuit for an open circuit or high resistance.
2. Perform PCM VERIFICATION TEST .
5) AMBIENT AIR TEMPERATURE SENSOR

Fig 4: Connecting Jumper Wire Between AAT Sensor Signal Circuit And Ground Circuit In AAT Sensor Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Connect the Powertrain Control Module (PCM) connector.

Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) AAT Sensor Ground in the Ambient Air Temperature Sensor harness connector.

Turn the ignition on.

With the scan tool, read the Ambient Air Temperature Sensor signal voltage.

Is the voltage below 1.0 volt with the jumper wire in place?

Yes
1. Replace the Ambient Air Temperature Sensor in accordance with the Service Information.
2. Perform PCM VERIFICATION TEST .
No
1. Go to 6).
6) POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ambient Air Temperature Sensor and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals.

Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.

Look for the data to change or for the DTC to reset during the wiggle test.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform PCM VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
2. Perform PCM VERIFICATION TEST .