how do you test the cps

[derty30]

im not good with the electronic ish i know its like 1-3 and 2-3 you test and i got the multimeter but not sure what to do

[E30_fiend]

I can't remember when to test which but I THINK you test 1 and 3 resistance with the ignition off then 2 and 3 resistance with the ignition in the on position.


Taylor

[nando]

ignition position doesn't matter, the sensor isn't powered by anything, it generates it's own A/C voltage.

You just need to check the resistance, should be I think ~540 ohms

[roblun]

Testing Pulse Sensor
(325i , 325is and 1 988 through 1 990 325 models)
Disconnect the electrical connector shown in Fig. 5-7. Using
an ohmmeter, check the resistance between terminal 1 (yellow
wire) and termi nal 2 (black wire) on the sensor side end of the
connector. If the resistance is not approximately 540 ± 54
ohms, the sensor is faulty and should be replaced . Remove the
sensor mounting bolt using a 5 mm hex wrench. When the
sensor is i nstalled, the distance between the sensor tip and the
toothed wheel should be 1 .0 ± 0.3 mm (.04 ± .01 in.) Tighten
the sensor mounting screw to 7 ± 1 Nm (62 ± 9 in. lb.) . Be
careful not to overtighten the mounting screw. Be sure the
wiring is correctly routed through the protective covering.