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.

VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
1. Turn the ignition on.
2. With the scan tool, read DTCs. Record the related Freeze Frame data if any DTCs are present.
3. Check the following items which may assist in repairing the customer's complaint successfully:
  - Check the vehicle's repair history. If the vehicle has a repair history that pertains to the customer's current complaint, review the repair.
  - Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
  - Check for any service bulletin(s) related to the customer's complaint or DTCs. If a service bulletin applies, follow the instructions per the service bulletin.
  Choose the following scenario that best applies.
  
  The service bulletin repaired the customer's complaint.
  - Testing complete.
  A DTC is present, the vehicle inspection revealed no concerns, no service bulletins apply, or the service bulletin did not repair the customer's complaint.
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. Start the engine and allow it to idle long enough for the Purge Solenoid to become active.
2. With the scan tool, read DTCs.
  Is the DTC active or pending?
  
  Yes
  - Go To 3
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (F344) ASD RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the Purge Solenoid harness connector.
3. Turn the ignition on.
4. Using a test light connected to ground, probe the (F344) Fused ASD Relay Output circuit at the Purge Solenoid harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (F344) Fused ASD Relay Output circuit for an open circuit or short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V .
CHECK THE (K52) PURGE CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Check for continuity between ground and the (K52) Purge Control circuit at the Purge Solenoid harness connector.
  Is there continuity between ground and the (K52) Purge Control circuit?
  
  Yes
  - Repair the (K52) Purge Control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V .
  No
  - Go To 5
CHECK THE (K52) EVAP PURGE SOLENOID CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K52) Evap Purge Solenoid Control circuit between the Purge Solenoid harness connector and the PCM C2 harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K52) Evap Purge Solenoid Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V .
PURGE SOLENOID
1. Turn the ignition off.
2. Measure the resistance across the terminals of the Purge Solenoid.
  Is the resistance between 10.0 and 15.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Replace the Purge Solenoid in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Purge Solenoid Assembly 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 related Sensor and the Powertrain Control Module harness 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, 16V .
  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, 16V .