car wont start. starter was bad, got a new starter. starter works if i jump the 30/87 pins on the CRNK relay. thought it might be the clutch fork switch, bought a new one (figured out i had the ohms on the wrong setting on my multimeter and the new & old both test out near the same resistance), got the sensor hanging down (temporarily) and car does nothing as i move the fork through its range while i have the key in "crank". I have continuity at the ECU plug between the tan and gray wire (9 & 14) if I jump them on the clutch switch plug. i hear the BCM clicking when I turn the key. I'm getting power to the run/crnk relay. Fuel pump primes. tried swapping around relays and then tested them, they're all good. i found a generic start diagram for a cobalt but the wiring is different and the colors dont match up so im hoping someone has an LNF one. Thanks all.

 

Its basically the same as all cobalts except for the ecm pin that supplies power for the starter relay. Need to check and make sure also your getting ground and 5v at your clutch pedal position sensor on terminal c and a

 

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ok, getting 5v to one side of the clutch sensor plug. also have ground continuity at the plug. also getting continuity between the middle pin and pin 37 on the ecu plug.

 

If thats the case then it sounds like your circuits and likely ecm are good. Really need a scan tool to check and see what your clutch pedal position data looks like to know if the ecm is getting the signal from the sensor.

 

hptuners shows the clutch sensor is working. goes from 'no' to 'yes' on a datalog when i push in the clutch.

 

Ecu swap did nothing.... the township ***** are fining me for having an inoperable car in my driveway. So, anyone got any ideas?

 

Check ground on transmission it's the on the bundle of three grounds on one of them bolted to trans I know one is maf one is starter other is idk yet