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Re: low voltage and ABS
- From: Mick <bmwmick@xxxxxxxxxxx>
- Date: Mon, 13 Aug 2007 12:07:12 -0700
- Subject: Re: low voltage and ABS
At 11:56 AM 8/13/2007, Mark Rivera wrote:
I was wondering about the low voltage & ABS issue..
Isn't there somewhere we can place a capacitor to provide a buffer
for the ABS needs at start time?
Is it the ABS microprocessor that's choking, or the ABS machinery
(i.e., that which modulates the brakes)?
You can look at the circuit here:
The low voltage during self-test in the control unit is what causes the fault.
Applying power AFTER the engine is started is the key to a successful ABS
initialization. There are a couple of ways to do this. The relay
above and/or using the load shed relay to supply the test 12V after cranking.
It would require a very large cap to be able to supply 12V during