Sensor Failure

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Connect EEC-IV 60-Pin Breakout Box to the anti-lock brake control module with ABS Adapter Cable.
Disconnect the suspect wheel speed sensor.
Check the harness for short to ground.
NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
1. Monitor the resistance between EEC-IV 60-Pin Breakout Box pins and ground as follows:
  
  Fig 1: EEC-IV 60-Pin Breakout Box Pins And Ground Resistance
  Courtesy of FORD MOTOR CO.
2. Drive over rough roads at various speeds.
3. If there is continuity between either circuit and ground, repair the circuit for a short to ground.
Check harness for open circuit.
NOTE: Connect jumper securely to the suspect sensor connector.
1. Connect a jumper between the two pins on the suspect sensor connector.
  NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
2. Monitor the resistance between EEC-IV 60-Pin Breakout Box pins as follows:
  
  Fig 2: EEC-IV 60-Pin Breakout Box Pins Resistance
  Courtesy of FORD MOTOR CO.
3. Drive over rough roads at various speeds.
4. If there is an open circuit detected between pins, repair the circuit(s) for an open circuit.
Check suspect sensor electrical connector.
NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
1. Monitor the resistance between suspect wheel speed sensor terminals while wiggling the electrical connector:
  
  Fig 3: Suspect Wheel Speed Sensor Terminals While Wiggling Electrical Connector - Resistance
  Courtesy of FORD MOTOR CO.
2. If the resistance is above specifications, install a new wheel speed sensor.
  NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
3. Monitor the resistance between suspect wheel speed sensor terminals while wiggling the electrical connector:
  
  Fig 4: Suspect Wheel Speed Sensor Terminals While Wiggling The Electrical Connector - Resistance
  Courtesy of FORD MOTOR CO.
4. If the resistance is below specifications, install a new wheel speed sensor.
  NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
5. Monitor the resistance between an wheel speed sensor terminal and ground on the highest resistance scale of the meter while wiggling the electrical connector.
6. If the meter shows anything other than open circuit, install a new wheel speed sensor.