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
NOTE:
Diagnose and repair any Throttle Position Sensor DTCs before continuing.
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
THROTTLE PLATE INSPECTION
1. Turn the ignition off.
2. Remove the Air Cleaner Assembly from the Throttle Body.
3. Inspect for any signs of coking or a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Manually move the throttle plate and check for any sticking.
  Were any signs of foreign material or scoring of the throttle plate or bore found?
  
  Yes
  - Clean the throttle blade and bore if possible or replace the Throttle Body Assembly if necessary. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the THROTTLE BODY SELF LEARN.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE ETC MOTOR
1. Disconnect the Throttle Body harness connector.
2. Check the connector and terminals for any corroded, pushed out or damage.
3. Measure the resistance of the ETC Motor between the ETC Positive circuit and the ETC Negative circuit at the appropriate terminals of the PCM harness connector.
  Is the resistance between 2.5 and 25 Ohms at closed throttle?
  
  Yes
  - Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Throttle Body Assembly. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the THROTTLE BODY SELF LEARN.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .