have a 99 grand prix gt for some reason i lost spark ran fine yesterday i replaced icm today fuses are good and no engine codes
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11-25-2014
have a 99 grand prix gt for some reason i lost spark ran fine yesterday i replaced icm today fuses are good and no engine codes
11-25-2014
Did you make sure you connected the icm ground?
12-01-2014
yes icm is ground just replaced the cps still no start maybe the ecm is bad?..the service engine soon is on with no codes and wont go off even when try to clear it
12-01-2014
The SES will stay on with the key on.
Have you checked all ICM fuses?
Security light isnt flashing right?
Just cranks and cranks with no fire?
12-02-2014
yup checked all fuses under the hood and the glove box not less am missing some and with the key in the Security light wont flash...yup that right
12-02-2014
I would look at the wiring from crank sensor to icm. Make sure you have power at the ICM.
12-02-2014
yes look at the wiring nothing broken and does have power going to the icm and to the sensors
12-02-2014
been looking around no broken wires all look pretty good..bad ground maybe idk running out idea here.. one of the grounds on the drivers by fender is rusty and corroded
12-02-2014
Ok.. so now it's time to look for signals when it's cranking. Have you tested the 3x and 18X from the cranks sensor?
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