shoebox

What is the reading when you touch your leads together? Is it 0? The wire should have virtually no resistance. Make sure you are getting solid contact to your leads. Test again between the PCM connector and C105, cavity E to isolate a portion of the circuit. C105 is shown in this pic.

Camaro350z28

when i touched my leads together i was getting a .5. so does that kinda mean its a .3 on the others? im not sure how ohms and resistances work

Camaro350z28

i found the cavity E on the c105... but which one am i testing on the pcm connect? d30?

Camaro350z28

ok ya thats what i was supposed to do.

so from DLC to the D30 i am at .8
from the C105 to the PCM i am at .6
just touching my leads together it sits at .5

now if you subract the .5 then the numbers seem to be ok right? or can you not do it like that? should i get a better volt/ohms meter?

shoebox

Whatever you read from your leads touched together should be subtracted from what you read when measuring the wire. Ex. .6 -.5 = .1. So, it's like you are thinking. Seems like the wires may be ok. Now you need to see what the voltage reading is coming out of the PCM. The connector is going to need to be plugged into the PCM, so it will power up. You'll have to backprobe D30 or pierce the wire with a straight pin and clip your meter lead onto it to take the reading.

Camaro350z28

ok.. well i got the PCM hooked back up and i tested the volts on the D30 at the PCM connector.

i got 7.1 - 7.2

i do have 4.5 - 4.6 inside i retested after i figured this thing out. so it still does not scan.. is this saying the PCM is bad? i am heading out to check more grounds now. thanks

Camaro350z28

cant believe i did that. i feel like an idiot. sorry for wasting your time. well i guess its not a total waste i know what to do in that situation.

i check all ground on the pcm they seem to be fine. grounds at the DLC are fine. volts are fine now. so is it safe to say my PCM is having the issue?

shoebox

Your friends car was a 95 Z28 like yours and it worked?

Sounds like you might have restored a marginal connection.

I would be skeptical it was the PCM as they rarely go bad. What is the make and model of the scanner?

Camaro350z28

my friends car was a 1995 cavalier z24... the scanner is at schucks, i could go down there and get the scanner number?

and i guess i didnt think of it as maybe the scanner just doesnt wanna read a camaro. ill look and see what kind of scanner it is. i tried 2 different schucks, both the same scanner and neither worked.

Camaro350z28

http://shop.oreillyauto.com/ProductD...egoryCode=3389


well thats the scanner i used. and i read it and it says some 94 & 95 models. great, if it was the scanner this whole time

glad i dont get mad too easy

shoebox

If it only had one cable that fit your DLC, it was probably the OBD-II cable-not the one you need to communicate with your car. You could try the standard 12 pin OBD-I cable and adapt it like this and see if it works.
I'm betting it's the scanner connection.

Camaro350z28

thats what i thought! i knew i know more than schucks workers. when i went in there for the cavalier i told them no not the obd2 cable i need the obd1 cable with an adapter for obd2 plug. thats what i got when i checked the cavalier. the 2nd time i went they gave me the scanner and a obd1 cord/connector.

then i said no i need the obd1 with obd2 connection and he just gave me back the obd2 cable. i bet its the cable that is the whole problem. maybe ill make some jumpers and then drive back down there.

Camaro350z28

my car will not idle now. ive gone over everything 3 to 4 times. i left nothign unplugged. it runs fine if i give it gas. but if i try to let it idle it immediately dies. what gives.

shoebox

It may just be stubborn about relearning since you had it powered down.

Camaro350z28

ok i got it running and back to schucks for another scan attempt. its still a no go. it will not scan. i used the jumper method from your site and it just wont connect still. maybe its just that type of scanner? i just wouldnt think they would leave out camaros