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Re: ABS Issue 1993 CE Posted by StoicBlue87 [Email]  (#1829) [Profile/Gallery]
(more from StoicBlue87) on Tue, 28 May 2024 08:54:13
In Reply to: ABS Issue 1993 CE, Darren Pulvirenti, Mon, 27 May 2024 17:42:41 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I went through some research/fault-tracing in the ABS area a little more than a year ago on my 92 900S.
I found some excellent description and instruction on Townsend's site and am copying the steps here.
And before I could even start hunting/diagnosing, I had to replace the Bosch EV1 plug connector because it was disintegrated and had broken apart; the 5-wire connection was dicey at best. This plug had been causing problems in the preceding years and I was finally stuck with fixing it before swimming any further into the ABS system. Fortunately, I could trace fault to the pressure switch. I swapped in an operational spare and brake pressure was restored (well, mostly...the replacement switch isn't 100% predictable but far better than the 50% performance I was getting with the original switch...gotta get that original switch rebuilt).
Good luck.
>>>>>>>>>>
The following is the Townsend quick ABS diagnosis checklist:
1: check all ABS fuses (all 3) in the ABS fuse/relay box on the right wheel-well.
2: Check for power at pump relay large red wire. If no power, find out why. If you have power, jump large red to the large yellow wire. The pump should run.
3: If pump does NOT run check the pump ground. (at the master cylinder assembly).
4: If the pump runs, disconnect the jumper and reinstall the relay, pump brake pedal until hard, turn ignition key on (engine off) and check for 12 V at double blue lead from pump relay; if 12V is present, replace pressure switch, it should have been grounded, assuming a hard brake pedal.
5: If 0 volts try a new relay. Once you get the pump running check accumulator and the rest of the system.
->Posting last edited on Tue, 28 May 2024 16:02:50.
, Tue, 28 May 2024 08:54:13 <-- Viewing This Message
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