Can't read ABS codes - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-16-2006, 06:14 PM   #11
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According to my 91SM, the EBCM is located where your fourth photo shows; in the bottom of the center console, held up by a flat support bracket.

The visual inspection says to check instrument panel (IP) fuses: 8, 13 and 16. Also underhood fuse block fuses: 1 and 2.

Do you hear the ABS pump come on when you turn on the ignition?

From the SM:
Quote:
"Antilock" indicator is on and no codes are set.
When the ignition is first turn to "run", the EBCM goes through a self test. During this test the EBCM grounds the 'antilock' indicator at terminal 52 causing the indicator to light for several seconds. This acts as a bulb test for the indicator. During normal operation the main relay applies voltage to the EBCM and PMV assembly. If the EBCM should detect a fault, the main relay will de-energize causing the 'antilock' indicator to light since it is grounded through the main relay contacts.

Possible Causes -
* Open or short to ground in CKT 852 (EBCM to AntiLock indicator)
* Open in CKT 151 (main relay gnd), 650 (fuse 8 to MR & EBCM), 800 (ADL wire), 803 (EBCM gnd), or 1077 (EBCM to Antilock Diode).
* Open main relay coil.
* Brake fluid level low or open fluid level switch.
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Old 10-17-2006, 03:27 PM   #12
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You are right marty It was that box, so apperently 1990 and 1991 are different in that aspect - for the help!
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Old 10-17-2006, 06:42 PM   #13
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Default abs

91 did not have the Teves unit. It was changed to the Delco in that year.
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Old 10-19-2006, 09:17 AM   #14
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ok, maybe that'* the reason then.

I have ordered a replacement unit today - fingers crossed that the car works after that!
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Old 10-19-2006, 03:18 PM   #15
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Default Re: abs

Quote:
Originally Posted by SSEBONNE4EVA
91 did not have the Teves unit. It was changed to the Delco in that year.
i was just going to say that
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Old 10-20-2006, 01:56 PM   #16
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Problem in paradise...

Today I put in my new (used, but should be ok) ATE controller (ABS/EBCM-unit). Same problem - the ABS light is always on...

I made the car power-less by removing the battery, in hope of resetting the master computer, but that didn't help.

So now I don't know what to do. Apparently my car (1991) have Delco and not Teves, so then I will have to use a Tech 2 reader

My idéa about replacing the front ABS sensors just by chance is not a good idéa because sensors cost about $300 each here in sweden. = not far from what I paid for the car... It'* a shame not to fix this car because it has only miled about 8700 US miles

Do you guys think that a Tech 2 reader will be able to read any codes - ie. is there a chance a pontiac service centre easily can figure out what is wrong? I can't spend a lot of money on this car, and I hate being left out in the hands of a mechanic telling me that "this and that has to be replaced" = expensive...

Any help deeply appreciated….

Ps: I just love the Internet! No matter what you are looking for, there are somebody out there with an answer – I just love the fact I found this forum!
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Old 10-20-2006, 04:45 PM   #17
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First off, Tech II does NOT work on OBD1 cars. It only works on OBD2 GM'*. I'm not sure if it works on the hybrid OBD1s, but if it does I will be surprised.

Second, ABS codes do not clear until the car has been driven past 30mph. And they won't clear under any circumstance unless the problem has been resolved.

Third, you need to find someone with an OTC scanner. Those will read the ABS codes on OBD1 systems. And I know this for a fact because I just did it today on my teves caddy. The OTCs are cheap and pretty easy to find at a dealer or whatever. Any GM dealer around here would have one... no idea about sweden; never been there. Just go there and ask if they have an OTC [4000? --padgett?] scanner for pre-93 GMs. If you go in there saying something smart like that, they often times won't go about ripping you off for some crap.
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Old 10-20-2006, 04:53 PM   #18
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Hmm, what is a OBD1 and a OBD2 car? I’m not familiar with the term…

I have not tried driving with the car after the swap of the ABS unit, I will try that tomorrow! Thanks for the tip though!

OTC scanner… Whats that? It’* the fist time I heard of that… Is that a cheap device like the GM code reader?

I’m learning new things every day here!
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Old 10-20-2006, 06:06 PM   #19
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First GM car computers were the C3 (Computer Command Control - introed in 1981
Second Gen was the P4 seen in some 86s this used an 8192 baud serial data stream and is now referred to as the OBD I
OBD II standardised the format and the plugs across the manufacturers and came out in 1995

Note: engine lines that did not change when the new model came out often kept the older version past the intro of their replacement
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Old 10-21-2006, 07:06 AM   #20
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Thx padget for the info!

Today I did a test drive to see if the ABS light went of, and it didn’t… :(

So now I guess my only option is to seek work shop with a “OTC 4000”… Thx for the help anyway!
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