no start no spark

[blk91]

Howdy guys,
Car has a phantom ignition problem I have no spark and my car obviously wont start. Code is 12 no rpm signal. Tried 2 different CPS's and still nothing. Traced wires and have good connectivity to ecu. Tried different Ecu and nothing. Any ideas?

 

[Nick M]

CP? Equador?

Does the tach fluctuate when you crank the engine? If it does, you could have the rare bad ECU. Don't count on it.

The best thing to do is use a scope that ECU. See that it is or isn't recieving the pick up signal.

 

[hvyman]

give the cps wires a good joggle while some one is cranking.

 

[blk91]

Sorry thats was CPS'S as in multiple cam position sensors, and ecuador was my phone trying to help spell ecu.....
Have jiggle the wires hundreds of time and replace about 3 feet of harness leading to the cps. I have connectivity from ecu pins to cps. And I tried a second ecu and nothing....I'll check for tach movement... how does that mean the ecu is bad?

 

[Nick M]

The tach will tell you if the CPS is putting out a signal. If it lies dead, that doesn't tell much other than what you already know. If it moves with rpm, you either lost the wiring to the ECU or the ECU itself is bad. The bad ECU is rare. That is why you check at the ECU with a scope.

 

[Black Cat]

After you replaced the CPS did you reset the timing as per the TSRM and did you clear your codes?

 

[mk3-4-me]

I currently have a supra thats on its way to getting fired up. I have a bad head so im getting a new one. But when i did try to crank my car over my tach moves a little up and down. So what does that mean? my ecu is fried?

 

[JStoked]

Man is your battery light and mil light coming on? Just askin I had a prob there.

 

[hvyman]

7m ecus dont go bad except for user error.

Have checked the resistance on either cps? IS the clip good? What about the starter signal circuit? COld start injector and time switch good?