Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for the VIN!
Have you checked for codes in the computer?
Are you looking for possible causes?
Thank you for that information.
What did you use to check the codes in the computer?
Ok we need to check for a reference voltage going to the TPS with the key in the ON position. This will verify that the computer is awake and powered up.
With a voltmeter on the 20 volt DC scale
YES< that will work.
The gray wire and the light blue wire going to the throttle body should have 5 volts on it with the key on.
Another thing if you could, check for a 5 volt reference going to the MAP sensor with the key on as well.
I suspect it is 4.48 volts? You only have a 12 volt battery. There is no way the TPS is getting 44 volts from the computer. If this checks out good, then we verify power to the ignition coil with the key on and cranking. We would also need to check the signal coming from the new crank sensor while cranking.
Do the ignition coils have power going to them with the key on and when cranking?
Did you check them all? Check both banks just to be sure. If still no power, then we need to check the IGN 1 relay operation.
Ok, good. So it sounds like the PCM is not activating the ignition coils to fire the spark. This is usually a faulty input. It could be a wiring issue from the cam or crank sensor to the computer or it could be a bad cam sensor. Was the cam sensor replaced?
Ok, You might want to check and replace that sensor as needed. Also, check the wiring from these sensors to the computer. If all checks out ok and the computer is still not firing the coils, the computer is at fault and will need to be replaced.
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