AO Gold Member
Join Date: May 2008
Location: United Kingdom
County: Perth and Kinross
You're half way there... You know that the l/h pin is ground (switch your multimeter to the continuity check, and you should get a beep from it if you touch this pin with one lead and an exposed nut or something on the chassis with the other).
I'm fairly certain (but not 100%) that the middle pin is the signal pin, and the r/h pin is the supply.
What you need to do is hook up something that lets you measure the voltage between the middle pin and earth while the sensor is plugged into the connector. I used some fine mig welding wire to poke down into the blue connector block and touch the wires in it.
Once you've got this arranged, keep the m/m connected to the pins while someone turns the engine over slowly by hand. The best way of doing this is to jack the o/s front up, put the car in 5th, and turn the road wheel. Be careful it doesn't start - removing the spark plugs makes it easier to turn and kinda prevents it starting!
From memory, the signal from the middle pin will be 5V until one of the gaps in the sensor ring passes the sensor, when the signal will drop to 0V. There are 2 gaps spaced close together in the CF2 1.8/2.0s. So you should get something like the one shown in the attachment. (Not to scale, 2 revolutions of the cam sprocket shown).
Anything other than that would indicate a bad sensor to me...
Last edited by iainfm; 14-02-10 at 15:03.