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Sensor Failure

  1. Connect EEC-IV 60-Pin Breakout Box to the ABS control with the ABS Adapter Cable.
  2. Disconnect the suspect anti-lock brake sensor.
  3. Check the harness for shorts.
      NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
      Fig 1: Shorts Harness Checking Table
      G02206616Courtesy of FORD MOTOR CO.
    1. Monitor the resistance between EEC-IV 60-Pin Breakout Box pins and ground, and between EEC-IV 60-Pin Breakout Box pins as follows:
    2. Drive over rough roads at various speeds.
    3. If there is continuity between either circuit and ground, or between the two circuits, repair the circuit(s) for a short.
  4. Check the harness for an open circuit.
      NOTE: Connect the jumper securely to the suspect sensor connector.
    1. Connect a jumper between the two pins on the suspect sensor connector.
      2. NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
      Fig 2: Open Circuit Harness Checking Table
      G02206617Courtesy of FORD MOTOR CO.
    2. Monitor the resistance between EEC-IV 60-Pin Breakout Box pins as follows:
    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.
  5. Check suspect sensor pigtail.
      NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
    1. Monitor the resistance between suspect sensor terminals while wiggling the pigtail.
    2. If the resistance does not remain between 2,400 and 2,800 ohms, replace the sensor.
      3. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
    3. Monitor the resistance between a sensor terminal, and ground on the highest resistance scale of the meter while wiggling the pigtail.
    4. If the meter shows anything but an open circuit, replace the sensor.
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