Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry your having this problem
do you have a multi meter or test light on hand ?
can you remove the starter relay and with the ignition key OFF does 1 terminal in the box the relay plugs into show 12 volts ?
then when you hold the key to the crank position will another terminal show 12 volts when holding to crank position ?
ok when holding the key to crank position does the fuse called crank show 12 volts on both sides of that fuse testing it in place through the little openings in the tops of that fuse ?
ok and can you do the same with the fuse called PCM ACC in the left inside fuse box ?
ok at this point with the other terminal NOT showing 12 volts when holding the key to crank at the relay terminal in the box that should get power from the fuse PCM ACC
after the power leaves that fuse it goes through the part neutral switch on the transmission then right to that terminal for the relay
can you see if the purple wire and the purple/white at the neutral switch both show 12 volts when you hold the key to crank ?
the park neutral switch is slid on the shaft off the transmission where the shift cable connects
terminal G and E as seen here
great job testing
if the transmission is in park then the problem is the neutral switch is bad as in park and neutral that switch should send the G power out the E wire which the E wire is the wire that goes right to the terminal for the starter relay which is missing the 12 volts
replacing the neutral switch should correct this problem and once 12 volts is restored to that terminal when holding the key to crank the relay should work and start the car up
here is the electrical on this system
it needs to be plugged in
and see if E wire shows 12 volts when holding the key to crank
if it does not the neutral switch is bad
if it does then that purple/white wire is bad between the neutral switch to the under hood fuse box or the terminal under the box or wire is bad under the fuse box OR internally the under hood fuse box is bad internally not completing the path of power from that wire to the relay terminal due to an internal non serviceable circuit board failur
no plug in the neutral connector and see if the E purple/white wire shows 12 volts when holding the key to crank
yes you can unplug the connector and jump E to G and see if the relay will click and work the starter when holding the key to crank for testing purposes
when you jump E to G and go in the car and hold the key to crank the starter will not operate ?
when jumped does another terminals for the relay show 12 volts ?
ok we know right now that the neutral switch is bad
as when plugged in and the car in park it should show 12 volts on the purple and the purple/white
you do NOT have 12 volts on the purple/white when plugged in and holding the key to crank
lets replace the neutral switch so we get 12 at BOTH of those 2 wires and see if it cranks over
with it unplugged i will bet the computer sees it unplugged and will not send its ground signal to work the relay
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so now in the box where he relay goes with the key held to crank 2 terminals show 12 volts ?
does another terminal show a good ground when you hold the key to crank ?
I am not sure what is going on with this issue
lets see if another expert can help
hang on another expert will reply back to you