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Old 12-06-2015, 03:33 PM   #1
dmwarnke
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Default 1999 Sc2 Abs Issue

Hi

I replaced the abs and master cylinder with a known good used unit.
The old unit had a code 46 that totally disabled the abs everytime
it did the initial abs test.

I bled the abs module according to Delco procedure. I ended up with
two abs codes. "right front expansion spring brake not holding" and left front
holding spring brake not holding". There was brake but the pedal had a lot
of travel. I pumped the brakes a bunch and it felt like I had a little more pedal. So I checked the codes again and now there was only one, " left front
expansion spring brake not holding.

Any ideas what might be causing the left front expansion code?

I
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Old 12-06-2015, 05:34 PM   #2
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2001 SC2
Default Re: 1999 Sc2 Abs Issue

My AllData thingy only shows DTC #'s, no descriptions, so what number code is it showing?

Last edited by fetchitfido; 12-06-2015 at 05:40 PM.
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Old 12-06-2015, 06:07 PM   #3
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Default Re: 1999 Sc2 Abs Issue

Code is 38
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Old 12-06-2015, 06:13 PM   #4
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Default Re: 1999 Sc2 Abs Issue

According to Bosch, abs code 46 is for Rear Motor Movement. What are the other codes?

What did you use for reading abs codes? What Delco procedures are you using?

Its presumed you're aware of hydraulic systems, with or without abs. Another presumption is the abs is off and all solenoids are closed, invisible to the brake system. Presuming this is correct, brake flush or bleeding procedures is straight forward with any excess pedal travel due to incorrect brake servicing and/or flushing/bleeding procedures.

ABS isn't serviced or repaired, as its not mentioned in service manuals. This makes you the Beta tester, replacing, repairing, and troubleshooting abs problems. Be sure you are separating brake hydraulics from abs problems. In normal situations, abs is always OFF, on standby and invisible to the brake system, allowing normal brake flush or bleed procedures. ABS requires a separate service manual to diagnose, troubleshoot and repair them. Flushing and bleeding abs units requires, from my understanding, GM's Tech II or aftermarket scantool to test, troubleshoot, diagnose, decode abs codes and activate abs solenoids to allow fluid flushing/bleeding procedures.
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Old 12-06-2015, 07:18 PM   #5
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2001 SC2
Default Re: 1999 Sc2 Abs Issue

Doesn't look good for that being a healthy ABS unit. Attached ABS Code 38 & diagnostic chart.

2 units having the same related issue's would point to it being a car side issue, either PCM/BCM or wiring rather than the unit however (looked into code 46).
Attached Files
File Type: pdf ABS DTC 38.pdf (52.2 KB, 4 views)
...
The proper way to fix a S-Series automatic is to replace it with a manual
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Old 12-06-2015, 08:18 PM   #6
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Default Re: 1999 Sc2 Abs Issue

Thanks for the trouble shooting of code 38. The code on the old unit was 46
and the code on the new unit is a code 38, so I think it' specific to the unit, not the vehicle. I did get the unit to go through the test without the abs light coming on. I disconnected each of the solenoids on top of the abs unit,
separately and at the same time, it threw the different codes for those being
disconnected and then I plugged them back in and the car went through the
test with no abs light. I tested it several times and all is good. I need to take it somewhere with a loose or slippery surface to make sure it is working.
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