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.

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN hardware DTCs, perform DTC before proceeding.
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
CHECK THE (A209) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Using a 12-volt test light connected to ground, check the (A209) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the open or short in the (A209) Fused B(+) circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance .
CHECK THE (Z908) GROUND CIRCUITS FOR AN OPEN
1. Using a 12-volt test light connected to 12 volts, check the (Z908) Ground circuits.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (Z908) Ground circuits for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance .
CHECK THE (F202) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F202) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the open or short in the (F202) Fused Ignition Switch Output (Run-Start) circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance .
CHECK THE (F342/F344) FUSED ASD RELAY OUTPUT CIRCUITS FOR AN OPEN OR SHORT
1. Connect a fused jumper wire between ground and the (K51) ASD Relay Control circuit in the PCM C1 harness connector.
2. Using a 12-volt test light connected to ground, check the (F342/F344) Fused ASD Relay Output circuits.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6
  No
  - Repair the open or short in the (F342/F344) Fused ASD Relay Output circuits.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance .
CHECK THE (D65) AND (D64) CAN C BUS CIRCUITS FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Anti-Lock Brakes Module (ABS) C1 harness connector.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the ABS C1 harness connector and the PCM C1 harness connector.
4. Measure the resistance of the (D64) CAN C Bus (-) circuit between the ABS C1 harness connector and the PCM C1 harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace and program the Powertrain Control Module in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance .
  No
  - Repair the (D65) or (D64) CAN C Bus circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to the appropriate Diagnostics & Testing article in Engine Performance .