Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With a scan tool, select read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
VERIFY THAT THE BODY CONTROL MODULE IS CAPABLE OF SETTING AMBIENT AIR TEMPERATURE SENSOR FAULTS
1. Check the BCM fault code list to verify that the BCM has the capability to set DTCs against the AAT Sensor. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX - 500 - EXCEPT ELECTRIC .
  Are there any AAT Sensor faults listed in the DTC list for the BCM?
  
  Yes
  - Go To 3
  No
  - Go To 4
CHECK THE BODY CONTROL MODULE FOR AAT SENSOR FAULTS
1. With the scan tool, read DTCs in the BCM.
  Is the BCM setting any DTCs against the AAT Sensor?
  
  Yes
  - Perform the diagnostic procedure in the BCM. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX - 500 - EXCEPT ELECTRIC .
  No
  - Replace and program the Body Control Module in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
CHECK THE AAT SENSOR WIRING
1. Turn the ignition off.
2. Disconnect the AAT Sensor harness connector.
3. Disconnect the appropriate BCM harness connector.
4. Check the AAT Sensor wires:
  - for an open condition.
  - for a short to voltage.
  - for a short to ground.
  - for a short to each other.
  Were any problems found with the wiring?
  
  Yes
  - Perform the appropriate repair of the wiring.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
AAT SENSOR
1. Replace the AAT Sensor in accordance with the Service Information.
2. Reconnect all harness connectors.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Is the DTC still active?
  
  Yes
  - Replace and program the Body Control Module in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Repair is complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .