Like many 240 and 760 owners I am again chasing a intermittent no start/spark problem. I was towed to the shop a couple of months ago after changing most of the electrical parts. It turns out my CPS of 4 years was bad even though it looked fine. The one that I replaced four years ago had all the insulation gone so it looked broken. Here is my question. Can I unplug the CPS and measure some kind of voltage while I am cranking to know my "new" CPS is working and I have another problem without buying another one? My new one is only a couple of months old. Also, has anybody added voltages to the wiring diagrams? I never know what voltage I am supposed to have at a given connector. Any help would be appreciated. I feel fortunate to be having my no spark/start episode in my driveway instead of at work or the grocery store, which has happened before.

It ended up being my fuel pump relay. I tapped on it and car started. I put in a replacement. I guess I need another backup now. Thanks for advice. I am still going to check out all the voltages at some point to aid my trouble shooting in the future. I read that a "logic probe" can be used to see the pulses of the CPS back probing at the connection with the wiring harness. Frys sells one on line at two different Hz ratings up to about 30 dollars. Once I figure out which one I need I am going to get one and see if I can test my CPS. I am also going to put in an old bad cps and hopefully I will see no pulses. I recently bought book by Tracy Martin How to Diagnose and Repair Automotive electrical systems. I am learning alot. Hopefully, I can stop being a parts changer and more of a problem solver.

My new one is only a couple of months old. Also, has anybody added voltages to the wiring diagrams?

Some voltage readings in this thread: http://www.brickboard.com/RWD/index.htm?id=1110273
--
Art Benstein near Baltimore

A thief broke into the local police station and stole all the
toilets and urinals, leaving no clues. A spokesperson was quoted as
saying, "We have absolutely nothing to go on."

Wrap the sensor wire w/ aluminum heating system tape. That usually stops any stray voltage.it acts like a shield.

Is your car a turbo (Bosch system) or a non-turbo Rex-Regina system?

It could be bad cap/rotor/wires/ground/Power Stage/ECU. Have you pulled any codes to maybe get an idea of what's going on? Try this & report back:
http://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm#FuelInjectionandIgnitionDiagnosticCodesi

Good Luck
Danny Mac