Diagnostic Test

WARNING: This page is about a different car, the 2014 Fiat 500e. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THE DTC IS ACTIVE
NOTE:
This DTC must be active for the results of this test to be valid.
1. Ignition on.
2. With the scan tool, read and record DTCs.
3. With the scan tool, read and record Freeze Fame information.
4. With the scan tool, erase DTCs.
5. Turn the ignition off. Remove the key from the Ignition Switch, close doors and allow the ABS Module to shut down.
  NOTE:
  Allow up to two minutes for the ABS Module to shut down. Opening the vehicle door will interrupt the shut down process.
6. Ignition on, in Ready Mode.
7. Press the brake pedal firmly and release.
8. With the scan tool, read and record DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the ABS INTERMITTENT CONDITION TEST. Refer to STANDARD PROCEDURE .
ANTI-LOCK BRAKE SYSTEM (ABS)
1. Perform any Technical Service Bulletins (TSBs) that may apply.
2. Turn the ignition off. Remove the key from the Ignition Switch, close doors and allow the ABS Module to shut down.
  NOTE:
  Allow up to two minutes for the ABS Module to shut down. Opening the vehicle door will interrupt the shut down process.
3. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
4. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  
  NOTE:
  For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit.
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Replace the Hydraulic Control Unit (HCU) in accordance with the Service Information. Refer to HYDRAULIC CONTROL UNIT (HCU), REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .