Speed Sensor (Other Models)

Disconnect 6-pin connector at amplifier. Connect ohmmeter between Dark Green/ White (speed sensor signal) and sensor ground. A reading of 200-300 ohms should be obtained.
A reading of zero ohms indicates a shorted coil, and a high reading indicates an open coil in sensor or open wire in harness. Repeat test at sensor. Replace sensor if resistance is not within 200-300 ohms. Repair wire harness if sensor resistance is okay.
If ohmmeter reads 200-300 ohms and speedometer operates properly within needle waver, sensor is probably good. Substitute a known good sensor if necessary to check operation.