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.

PERFORM THE TLC RELEARN PROCEDURE
NOTE:
The Clear Misfire TLC Miscellaneous Function must be performed using the scan tool anytime there has been a repair/replacement made to a powertrain system, for example: flywheel, valvetrain, camshaft and/or crankshaft sensors or related components.
1. Turn the ignition on.
2. With the scan tool, select PCM/Misc. Functions/Clear Misfire TLC and follow the on screen instructions.
  NOTE:
  If a negative response is displayed after the Clear Misfire TLC procedure is performed, start the engine and perform the Clear Misfire TLC procedure over until the misfire monitor is cleared.
3. Start the engine and allow the coolant temperature to increase above 60°C (140°F).
4. With the scan tool, select Monitors / OBD II Monitors / Misfire Monitor Screen, and observe the Misfire Monitor Status.
5. Perform a 6000 RPM WOT stab and let the engine return to idle.
  NOTE:
  The status should change from waiting to in progress, verifying that the misfire monitor is active and the learn procedure is complete.
  
  Did the PCM complete the TLC Relearn procedure?
  
  Yes
  - Go To 2
  No
  - Start the process over until the Relearn procedure is completed.
CHECK FOR AN ACTIVE DTC
1. Turn the ignition off.
2. Turn the ignition on, engine not running.
3. With the scan tool, erase all DTCs.
4. Start the engine and allow it to idle.
5. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 3
  No
  - Repair is complete.
WIRE HARNESS INSPECTION
1. Turn the ignition off.
2. Visually inspect the CKP wire harness. Look for any chafed, pierced, pinched, or partially broken wires.
3. Visually inspect the CKP wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
4. Verify that there is good pin to terminal contact in the Crank Position Sensor and Powertrain Control Module connectors.
5. Ensure that the Crankshaft Position Sensor is properly installed and the mounting bolts are torqued to the proper specification.
  Were any of the above conditions present?
  
  Yes
  - Repair as necessary
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
TONE WHEEL/VIBRATION DAMPER INSPECTION
1. Remove the Crankshaft Position Sensor. Refer to SENSOR, CRANKSHAFT POSITION, REMOVAL .
2. Inspect the Tone Wheel/Flex Plate for damage, foreign material, or excessive movement.
  Were any problems found?
  
  Yes
  - Repair or replace the Tone Wheel/Vibration Damper as necessary. Refer to DAMPER, VIBRATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CRANKSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.

Repair
- Replace the Crankshaft Position Sensor. Refer to SENSOR, CRANKSHAFT POSITION, REMOVAL .
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .