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
1. Ignition on, engine not running.
2. With the scan tool, erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, select View DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go To 2
  No
  - The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  - Perform the ABS INTERMITTENT CONDITION TEST. Refer to STANDARD PROCEDURE .
CHECK CONNECTOR/TERMINAL FOR DAMAGE
NOTE:
Check all terminals for broken, bent, pushed out, or corroded terminals.
1. Turn the ignition off.
2. Inspect the Wheel Speed Sensor harness and connector.
3. Inspect the Wheel Speed Sensor for excessive debris on the sensor.
  Were any problems found?
  
  Yes
  - Repair as necessary in accordance with the Service Information.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the ABS Module harness connector.
2. Disconnect the Left Front Wheel Speed Sensor harness connector.
3. Measure the voltage between the (B9) Left Front Wheel Speed Sensor Supply circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B9) Left Front Wheel Speed Sensor Supply circuit for a short to voltage.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the Right Front Wheel Speed Sensor harness connector.
2. Measure the voltage between the (B7) Right Front Wheel Speed Sensor Supply circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B7) Right Front Wheel Speed Sensor Supply circuit for a short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK (B4) LEFT REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the Left Rear Wheel Speed Sensor harness connector.
2. Measure the voltage between the (B4) Left Rear Wheel Speed Sensor Supply circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B4) Left Rear Wheel Speed Sensor Supply circuit for a short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
CHECK (B7) RIGHT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the Right Rear Wheel Speed Sensor harness connector.
2. Measure the voltage between the (B2) Right Rear Wheel Speed Sensor Supply circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B2) Right Rear Wheel Speed Sensor Supply circuit for a short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 7
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
2. Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  CAUTION:
  Make sure braking capability is available before road testing.
3. Road test the vehicle over 40 km/h (25 mph).
  NOTE:
  Vehicle must be driven above 40 km/h (25 mph) for set conditions to be meet.
4. With the scan tool, read ABS DTCs.
  Does the remain active at this DTC?
  
  Yes
  - Replace the Wheel Speed Sensors in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, FRONT, REMOVAL .
  - Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test complete.