Testing sensor from model C

[ebaudin]

Hello,

I have just bought a concept 2 model C without the PM.
Before ordering a PM5 (the PM4 does not seem to be available on common shop), I would like to test if the sensor is sending a signal until the jack plug. How could I do this ? (I tried to get a voltage whhile the wheel is turning without result).

Thanks !

[Citroen]

You'd need an oscilloscope. You'd then see a sawtooth waveform. Trying to measure it with a multimeter is impossible. You may be able to read it with an ADC as long as your sampling rate is high enough. The other way is with the sound card on your laptop (connect it to the mic in) and use something like Audacity to record it.

[Carl Watts]

Its just a coil of wire.

Get a multimeter and measure the resistance on the plug end, it should be 105 Ohms +/- 5 Ohms. If the resistance is okay then the sensor is fine.

You need an oscilloscope to measure the Voltage, its tiny millivolt spikes each time one of the three magnets in the flywheel pass by the sensor.

Chances are the 2 wire lead/sensor is fine on a Model C, its the three wire Model D sensor that has most of the problems