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94 Z28 coupe

Gave it a bath, new battery. Put the Granitelli air sensor on it. Hit the EGR code on the Tech 1A that @ZooMad75 was nice enough to let me abuse

Pulling the fuse dumped the air bag light. Pulling the fuse, the other fuse, and the relay did nothing to the abs light. Now I'm thinking the pcm doesn't see the module

With the new MAF on, it idle hunts a bit. Turned the set screw up and got the IAC number back down
 
Bent77 said:
Ordered some new tires
www.bfgoodrichtires.com

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Click to expand...
We had those on our Pontiac G6 GT, Wasn't a power monster of a car but those tires shed rooster tails sideways in standing water, people wouldn't pass us. They were decent in the snow and lasted well for us.
 
After Zoo retrained this monkey, I was able to get to the rest of the DTC numbers that I needed to find

55
86
32
33
35
91
92
93

One is for the EGR, the others all run through or into the brake control module. So with a little research found some more things that cause these issues besides just an EBCM failure. Printed off some wiring diagrams

Tires should show up today. Not sure why FedEx has a Sunday infatuation
 
Some of both. Cleared all of them and the EGR, EBCM, and wheel speed sensors all came back
 
Happy the Tech1 is working for you. I had to get a quick refresher myself since I haven't used the darn thing in years. I think the one at the shop has been pulled out of the cart twice since I've been there in 11 years. We just don't see that many pre-'96 cars or trucks in the shop anymore.

The 55 code to me is most likely an internal fault within the EBCM that can only be fixed by the replacement of that part. Not likely to be had new by GM or the aftermarket. Used is a 50/50 roll of the dice to have the same problem you already got. Thankfully, you can separate it from the pump which is the more expensive of the two components.

The speed sensor codes should be easy to flesh out though. Drive it while somebody watches the tech1 on the data screen. You should be able to see the speed sensor values live. Going straight they all should be the same +/- 1 mph. Any that drop out or flat don't read is where you start looking. I always check the connections near the wheel speed sensors to make sure they haven't been damaged in some way. Speed sensor wiring is always done with a twisted pair of wires with shielding. If the wiring looks good, it is time to look at the sensors.

If you want I should be able to pull the diagnostics from Prodemand and shoot them your way if you want it.
 
Here’s my plan of attack. Me and the multi meter are going hunting

1) confirm the switch at the brake is opening and closing the signal to the EBCM
2) pull the air intake off and go over every wire on the EBCM. All the other grounds looks good, and it has a new battery
3) RF wheel sensor is not sending anything to the Tech1. That will get a good view when the new shoes go on. LF is intermittent

4) with the air intake off, clean the IAC and take a peek at the EGR
 
Yeah it gets driven around in the summer a little bit and then put away. It’s needed the stuff fixed that been mentioned for awhile. With a company vehicle and a fleet of other random vehicles, it doesn’t get pressed into service much.
 
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