Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
When you turn the key just to the on position, does the security light come on and stay on after 15 seconds without trying to start it? Or does it come on for a couple seconds then go off?
Good. it sounds like the security system isnt locking it out.
Thats the only thing that usually happens if it was running ok and all you did was disconnect the battery to repace the pump.
The most common reason for lack of spark is either the ignition control module or the crankshaft position sensor but its difficult to test. Below is some info on how you can test the ignition system and it will lead you to the cause.
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Hi, you can try this:
30 Minute Learn Procedure
Important: The vehicle learns the Passlock Sensor Data Code and/or password ***** the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Keep in mind that if you have a wiring issue, this may not work, or it may work but the system will fail again at some point, until you have this accurately diagnosed and repaired.