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Re: 1995 TCS Manual Aero Burning Up ABS Hydraulic Pump Relays
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Posted by urbanshocker [Email] (#2465) [Profile/Gallery] (more from urbanshocker) on Thu, 23 Apr 2020 10:30:26 Share Post by Email
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Here are the notes from my mechanic:

TCS and ABS lamps on with vehicle idling erratically, Tech 2 was able to pull throttle body related codes, smoke test showed no manifold leaks. Voltage sweep of throttle body showed minimum voltage of .62 sweeping lineally to 4.85 volts with no drop offs. Voltage sweep of MAP sensor while applying vacuum and positive pressure with no faults found. Tested vacuum check valves for throttle body vacuum valve with no faults found. Tech 2 finally communicated with ABS ECU with fault code for main relay. Performed voltage drop of main relay contacts with 3.44v found. This is excessive. Disassembled relay to find burned and pitted contacts. Replaced relay, cleared codes and test drove with no faults returning.

Car ran beautifully for about a week and then it appears we're in the same situation once again. The relay we used for the repair above was a Bosch unit, not OEM.

I was able to locate used OEM relays, but it appears that we have a deeper issue. Any chance that the OEM relay will hold up and not burn out, or are we sure to have some serious TCS issue that burn out anything we put in there?

Sorry for the length, just wanted to be thorough. Thanks in advance for your time.

->Posting last edited on Tue, 28 Apr 2020 08:42:07.
_______________________________________
Lilly: 1995 9000 Aero (Imola Red, TCS, manual)
Klara: 1996 9000 Aero (Scarabe Green, manual)
Ilsa:  1997 900T SE (Cayenne Red, manual)
Greta: 1998 9000 CSE (Black, manual)
Ande:  2005 9-5 Arc (automatic) 
Vilma: 2008 9-5 2.3T Sportcombi (manual)
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