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) AAT SENSOR VOLTAGE ABOVE 4.98 VOLTS
Ignition on, engine not running.

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

Is the voltage above 4.98 volts?

Yes
1. Go To 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
2) AAT SENSOR

Fig 1: Checking Ambient Air Temperature Sensor Signal Circuit & Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Ambient Air Temperature Sensor harness connector.

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

Ignition on, engine not running.

With a scan tool, read AAT Sensor voltage.

Is the voltage below 1.0 volt with the jumper wire installed?

Yes
1. Replace the Ambient Air Temperature Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 3).
  NOTE: Remove the jumper wire before continuing.
3) (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 2: Checking Ambient Air Temperature Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the C2 FCM harness connector.

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 battery voltage in the (G31) AAT Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 4).
4) (G31) AAT SIGNAL CIRCUIT OPEN

Fig 3: Checking Ambient Air Temperature Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance of the (G31) AAT Signal circuit from the AAT Sensor harness connector to the C2 FCM harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To 5).
No
1. Repair the open in the (G31) AAT Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
5) (G931) SENSOR GROUND CIRCUIT OPEN

Fig 4: Checking Ambient Air Temperature Sensor Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (G931) Sensor ground circuit from the AAT Sensor harness connector to the C2 FCM harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To 6).
No
1. Repair the open in the (G931) Sensor ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
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 .