How to test the CPS aka impulse sensor?
08-10-2012, 09:41 AM
#1
Rennlist Member
Thread Starter
How to test the CPS aka impulse sensor?
How do I know if it is any good?
-Kevin
-Kevin
08-10-2012, 12:55 PM
#3
Rennlist Member
WSM, section 28 pg. 56. Disconnect the EZF/EZK connector and connect an oscilloscope between the CPS signal and ground (pins 7 & 19 respectively for an EZF). You are looking for 2.5 volts or more, peak-to-peak, while cranking.
For 87+ cars (S4/GT/GTS) it is the same, except page D28-11 in the S4/GT supplement, signal on pin 23 & ground on pin 6 of the EZK plug, and 3.0 volts or more while cranking.
Or just swap it for a known-good CPS. The most common failure is that the connector disintegrates, and then the whole thing gets destroyed trying to get it out.
For 87+ cars (S4/GT/GTS) it is the same, except page D28-11 in the S4/GT supplement, signal on pin 23 & ground on pin 6 of the EZK plug, and 3.0 volts or more while cranking.
Or just swap it for a known-good CPS. The most common failure is that the connector disintegrates, and then the whole thing gets destroyed trying to get it out.
