GM Repair Problems? Ask GM Repair Expert Now.
Ok, sounds good
Ok....disregard first photo I sent you...I believe it is incorrect. Your crank fuse is going to be in the dash fuse block....do you have the label for that. You will need to check for power there while turning the ignition to the crank position
Are you having someone turn the ignition to crank while you are testing for power at the starter. And that is correct that you are only getting power at the crank fuse when ignition is in crank position. If you are not getting power in crank position at the starter we need to test your starter reala circuits.
If you remove your starter ,relay there are four pins. Test that you have battery voltage at one of the pins
That will be pin 30 of your relay
If you have power there...you will need to check that one of the pins has power with ignition in the crank position ( that will be power from your crank fuse). Then kitty corner to that will be ground...then kitty corner to pin 30 will be the wire that goes to your starter(pin 87 on your relay)
You have constant power on two of the pins?
Do you know what pin numbers they are in relation to the relay?
And your fuse box looks like the first picture I sent ...everything lines up with the picture? Cause for some reason I have two different ones...I'm thinking there is a year split
Wow! I'm losing my mind....I was talking with a guy with a 2000 chevy and got my self mixed up
Okay....right diagram now....you should have power on two of them. Pin 30 is constant power. Pin 85 will be constant power in park and neutral only.
Still..if you jump 30 and 87 of relay....if starter is good it should crank
Great....that will do it then. So you are getting power at purple wire when you crank then?
If not getting power there and relay not clicking yes there is a problem
So...just to recap....you do have power at 30 and 85 of relay, correct?
OK...now what we need to check is pin 86 ...that needs to be ground when cranking
Where are you located....is rust an issue where you are?
I'm going to guess you have no ground there when cranking. Here's how this system works. When cranking ignition sends power to PCM through the crank fuse, the PCM then sends a ground signal to the start relay.
Is the battery fully charged?, are battery cables clean and tight? Especially the ground at the battery and where it attaches to engine.
If you have a set of jumper cables attach one end to ground on the battery and other end directly to the engine see if anything changes...I'm thinking your starter may actually be good
OK power for those fuses come from the ignition 1 relay (the relay labeled 5 in our fuse block diagram). Check that you have constant power on pin 30 of that relay. Then chek pin 85 and 86. One should be ground and the other will be power with key in run position and cranking position
I'm not sure which is which, it does not specify in the wiring diagram. As long as you have power on one and ground on the other, your good
OK....why missing? Alright so when you got that working with your ground....I assume everything started working and you will have power at your purple at the he started now ...i hope. Anyhow. You will need a relay for there. But that ground needs to be repaired. The ground for that comes from the left rear of the engine....bolted to thebackof the head or block. Thats where I would start :)
Do you still have power on 85 and 30 of the starter relay?
86 is ground from the PCM....should only be ground there when cranking. And should have power on 85 and 30 of the start relay. 30 constant and 85 at least when in crank position
So with ground on 86 and power on 85 that has to activate your relay. Or the relay is bad
Or. Your purple wire is broke somewhere.
What are you using to test powers and grounds with?
You mentioned a powerprobe earlier.....do you have anything with a bulb in it...something that is going to draw some current
Which pins are you jumping on the relay?
Thats bad....don't do that. 30 and 87....87 is the purple wire
87 =purple wire
30= constant power
86= should be ground only when cranking comes from PCM
Check 86 with a standard bulb type test lamp and see if it lights
OK there are two grounds you need to check....one is for the ignition relay the other is a main ground source for the PCM. Both are on the top back of the engine. One should be will be bolted to the block on the rear of the engine just below the head on driver side. The other should be from top down rear center of the block little towards the passenger side.
Ok, let me know how you make out
Hopefully this works....been trying to send this photo all day :\