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.

DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
1. Attempt to start the engine. If the engine will not start, crank the engine for five seconds.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. Using the scan tool, read the active DTCs.
  Does the scan tool display P0627-00-FUEL PUMP CONTROL CIRCUIT/OPEN?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
(A64) ELECTRIC FUEL PUMP RELAY FEED CIRCUIT SHORTED TO ANOTHER VOLTAGE SUPPLY CIRCUIT
1. Turn the ignition off.
2. Remove the Fuel Pump Relay from the Power Distribution Center (PDC).
3. Disconnect the Powertrain Control Module (PCM) C1 harness connector.
4. Measure the resistance between the (A64) Electric Fuel Pump Relay Feed circuit and all other 5 volt and 12 volt supply circuits at the PCM C1 harness connector.
  Is the resistance above 10k Ohms between the (A64) Electric Fuel Pump Relay Feed circuit and all other 5 volt and 12 volt supply circuits?
  
  Yes
  - Go To 3
  No
  - Repair the (A64) Electric Fuel Pump Relay Feed circuit for a short to the circuit that measured below 10k Ohms.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .
(A64) ELECTRIC FUEL PUMP RELAY FEED CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (A64) Electric Fuel Pump Relay Feed circuit in the (PCM) C1 harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (A64) Electric Fuel Pump Relay Feed circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .
(A64) ELECTRIC FUEL PUMP RELAY FEED CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (A64) Electric Fuel Pump Relay Feed circuit between the Fuel Pump Relay connector and the PCM C1 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (A64) Electric Fuel Pump Relay Feed circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .
(Z910) ELECTRIC FUEL PUMP RELAY GROUND CIRCUIT OPEN OR HIGH RESISTANCE
1. Measure the resistance of the (Z910) Electric Fuel Pump Relay Ground circuit between Ground and the Fuel Pump Relay connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (Z910) Electric Fuel Pump Relay Ground circuit for an open circuit or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pump 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.
4. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 16V Turbo .