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Home >> Ford >> 2003 >> ZX2 Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Anti-Lock Brake System -Traction Control) >> Diagnosis And Testing >> Anti-Lock Control - Traction Control >> Component Test - Intermittent Failures >> Sensor Failure
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Sensor Failure

WARNING: This page is about a different car, the 2003 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Run the vehicle through a car wash to aid in observing electrical problems that can occur only when the system is wet.
  1. Disconnect the suspect anti-lock brake sensor.
    2. NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
    Fig 1: Anti-Lock Brake Control Module Connector Chart
    G01306193Courtesy of FORD MOTOR CO.
  2. Check the harness for short to ground. Monitor the resistance between anti-lock brake control module connector C135 pins and ground as follows:
    • Drive over rough roads at various speeds.
    • If there is continuity between either circuit and ground, repair the circuit for a short to ground.
    3. NOTE: Connect jumper securely to the suspect sensor connector, wire harness side.
    NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
    Fig 2: Anti-Lock Brake Control Module Connector Chart
    G01306194Courtesy of FORD MOTOR CO.
  3. Check harness for open circuit. Connect a jumper between the two pins on the suspect sensor connector, wire harness side. Monitor the resistance between anti-lock brake control module connector C135 pins as follows:
    • Drive over rough roads at various speeds.
    • If there is an open circuit detected between pins, repair the circuit(s) for an open circuit.
    4. NOTE: Use 88 Digital Multimeter with the maximum resistance hold feature enabled for this test.
  4. Check suspect sensor electrical connector.
    • Monitor the resistance between suspect anti-lock brake sensor pins (component side) while wiggling the electrical connector.
    • If the resistance is above 2,200 ohms, install a new anti-lock brake sensor.
      • NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
    • Monitor the resistance between suspect anti-lock brake sensor pins (component side) while wiggling the electrical connector.
    • If the resistance is below 1,710 ohms, install a new anti-lock brake sensor.
      • NOTE: Use 88 Digital Multimeter with the minimum resistance hold feature enabled for this test.
    • Monitor the resistance between the two anti-lock brake sensor pins (component side) and ground on the highest resistance scale of the meter while wiggling the electrical connector.
    • If the meter shows anything but open circuit, install a new anti-lock brake sensor.
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