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Component Test - Intermittent Failures: Sensor

  1. Connect EEC-IV 60-Pin Breakout Box to the anti-lock brake system (ABS) module with ABS Adapter Cable.
  2. Disconnect the suspect wheel speed sensor.
  3. 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:
      SENSOR/BREAK-OUT BOX PINS/CIRCUIT CHART

      Sensor Break-out Box Pins Circuits
      Left front wheel speed sensor 12 and 4 521 (TN/OG) and 522 (TN/BK)
      Right front wheel speed sensor 13 and 5 514 (YE/RD) and 516 (YE/BK)
      Rear axle speed sensor 14 and 6 523 (RD/PK) and 519 (LG/BK)
    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.
  4. 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.
      2. 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:
      SENSOR/BREAK-OUT BOX PINS/CIRCUIT CHART

      Sensor Break-out Box Pins Circuits
      Left front wheel speed sensor 12 and 4 521 (TN/OG) and 522 (TN/BK)
      Right front wheel speed sensor 13 and 5 514 (YE/RD) and 516 (YE/BK)
      Rear axle speed sensor 14 and 6 523 (RD/PK) and 519 (LG/BK)
    3. Drive over rough roads at various speeds.
    4. If there is open circuit detected between pins, repair the circuit(s) for an open circuit.
  5. 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:
      SENSOR TERMINALS RESISTANCE CHART

      Sensor Resistance
      Front 
      4x2 4000 ohms
      4x4 500 ohms
      Rear 
      4x2 or 4x4 3500 ohms
    2. If the resistance is above specifications, install a new wheel speed sensor.
      3. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
    3. Monitor the resistance between suspect wheel speed sensor pins (component side) while wiggling the electrical connector:
      SENSOR PINS (COMPONENT SIDE) RESISTANCE CHART

      Sensor Resistance
      Front 
      4x2 2000 ohms
      4x4 300 ohms
      Rear 
      4x2 or 4x4 800 ohms
    4. If the resistance is below specifications, install a new wheel speed sensor.
      5. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
    5. Monitor the resistance between an wheel speed sensor pin (component side) and ground on the highest resistance scale of the meter, while wiggling the electrical connector.
    6. If the meter shows anything but open circuit, install a new wheel speed sensor.
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