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Corvette
C5 Forum
ABS LIGHT COMES ON PERIODICALLY
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<blockquote data-quote="Music" data-source="post: 262104" data-attributes="member: 7765"><p>The intermittent problem will stop resurfacing when the TCS isn`t being used (for instance after winter). During summer, you can lock up your brakes on a gravel road to activate the system. Alternately, you may be able to produce the issue with a scan tool that has the ABS bleed function. Both ABS and TCS use the same underlying principles of operation and exercise the same electromechanical electronic circuits that typically become faulty.</p><p></p><p>I did an entire detailed writeup well over a decade ago on the corvette forums explaining how to repair the EBCM with equivalent generic relay part number. As there was a low cost online repair outfit offering EBCM repair at the time, I didn`t put much thought into repairing these, partly because of the inconsistency in their design midway through that generation`s production.</p><p></p><p>The first generation EBCM for the C5 is mostly non-repairable due to the electronic components being unencapsulated and entirely potted, particularly when the relay is not the cause. The redesigned units from 01-04 I can usually repair although I don`t have a bench jig to interrogate & test as would Delphi or its partners. There is no business case for this due to economies of scale.</p><p></p><p>In the case of failure caused by internally broken solder joints, the first generation can be repaired, as in the case where only the relay is faulty. However, sometimes the relay drive transistors could be burned out which is unencapsulated & potted.</p></blockquote><p></p>
[QUOTE="Music, post: 262104, member: 7765"] The intermittent problem will stop resurfacing when the TCS isn`t being used (for instance after winter). During summer, you can lock up your brakes on a gravel road to activate the system. Alternately, you may be able to produce the issue with a scan tool that has the ABS bleed function. Both ABS and TCS use the same underlying principles of operation and exercise the same electromechanical electronic circuits that typically become faulty. I did an entire detailed writeup well over a decade ago on the corvette forums explaining how to repair the EBCM with equivalent generic relay part number. As there was a low cost online repair outfit offering EBCM repair at the time, I didn`t put much thought into repairing these, partly because of the inconsistency in their design midway through that generation`s production. The first generation EBCM for the C5 is mostly non-repairable due to the electronic components being unencapsulated and entirely potted, particularly when the relay is not the cause. The redesigned units from 01-04 I can usually repair although I don`t have a bench jig to interrogate & test as would Delphi or its partners. There is no business case for this due to economies of scale. In the case of failure caused by internally broken solder joints, the first generation can be repaired, as in the case where only the relay is faulty. However, sometimes the relay drive transistors could be burned out which is unencapsulated & potted. [/QUOTE]
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Corvette
C5 Forum
ABS LIGHT COMES ON PERIODICALLY
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