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Speed Sensor

Disconnect sensor wires from amplifier and connect an ohmmeter between wire connector terminals (green & black). A reading of about 40 ohms should be obtained. A reading of 0 ohms indicates a shorted coil and a maximum reading indicates an open coil. Replace sensor in either case. If reading is 40 ohms and speedometer operates properly, speed sensor is probably good. A new sensor should be substituted in place of old sensor to check for proper operation.

Fig 1: Wiring Diagram of Ford Motor Co. Automatic Speed Control System.
G09343988Courtesy of FORD MOTOR CO.
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