2004 Ford F-150 Workshop Manual

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Filed Under (Ford) by admin on 24-06-2010

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Pinpoint Test E: DTC C1145 (RF), DTC C1155 (LF), DTC C1230 (Rear) — Wheel Speed Sensor Input Circuit Failure Normal Operation The active wheel speed sensor generates a square wave signal that is sent to the anti-lock brake system (ABS) module. The wheel speed sensor circuitry connects to the ABS module through two wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage to all of the wheel speed sensors and its circuitry to determine if they are functional. Battery voltage and a ground signal are supplied to the wheel speed sensors from the ABS module. Possible Causes wheel speed sensor circuit 514 (YE/RD) open, short to power, or short to ground circuit 516 (YE/BK) open, short to power, or short to ground circuit 518 (LG/RD) open, short to power, or short to ground

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