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.

CHECK FOR AN ACTIVE DTC
NOTE:
Inspect the tires for improper air pressure and or mismatched tires before continuing, repair as necessary.
1. Turn the ignition on.
2. With the scan tool, read ABS DTCs and record on the repair order.
  CAUTION:
  Make sure brake capability is available before road testing.
3. Road test the vehicle over 40 km/h (25 mph).
4. With the scan tool, read ABS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the ABS-INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION .
INSPECT THE REAR WHEEL SPEED SENSOR WIRING
1. Turn the ignition off.
2. Check that the rear wheel speed sensor wiring harnesses are correctly routed to the proper rear wheel speed sensor.
  Are the Wheel Speed Sensor's wired correctly?
  
  Yes
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .