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.
  NOTE:
  Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a load test before continuing.
2. With the scan tool, read the active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
    NOTE:
    If the P2100 is intermittent, it is possible that the controller is overheating in extreme hot temperatures and this is considered a normal protection operation. No repair is necessary.
CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR A SHORT TO 5.0 VOLTS
1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Disconnect the PCM C2 harness connector.
4. Check for continuity between the (K447) ETC Motor (+) circuit and the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  Is there continuity between the (K447) ETC Motor (+) circuit and the (F855) 5-Volt Supply circuit?
  
  Yes
  - Repair the (K447) ETC Motor (+) circuit for a short to the (F855) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K448) ETC MOTOR (-) CIRCUIT FOR A SHORT TO 5.0 VOLTS
1. Check for continuity between the (K448) ETC Motor (-) circuit and the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  Is there continuity between the (K448) ETC Motor (-) circuit and the (F855) 5-Volt Supply circuit?
  
  Yes
  - Repair the (K448) ETC Motor (-) circuit for a short to the (F855) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK FOR THE (K447) ETC MOTOR (+) CIRCUIT SHORTED TO THE (K448) ETC MOTOR (-) CIRCUIT
1. Check for continuity between the (K447) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.
  Is there continuity between the (K447) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit?
  
  Yes
  - Repair the short to between the (K447) ETC Motor (+) circuit and the (K448) ETC Motor (-) circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.
  Is there continuity between ground and the (K447) ETC Motor (+) circuit?
  
  Yes
  - Repair the (K447) ETC Motor (+) circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (K448) ETC MOTOR (-) CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.
  Is there continuity between ground and the (K448) ETC Motor (-) circuit?
  
  Yes
  - Repair the (K448) ETC Motor (-) circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
ETC MOTOR
1. Connect the voltmeter positive lead to the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.
2. Connect the voltmeter negative lead to the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.
3. Turn the ignition on.
4. With the scan tool, actuate the Throttle Follower Test.
5. Slowly press and release the Accelerator Pedal while monitoring the voltage.
  Is the voltage changing as the Throttle Body Valve position changes?
  
  Yes
  - Replace the Throttle Body Assembly. THROTTLE BODY . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
4. Perform any Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL and PROGRAM THE PCM (POWERTRAIN CONTROL MODULE) .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .