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Re: ABS light always on in 1990 Turbo 2.0 liter Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 10 May 2007 10:30:14
In Reply to: ABS light always on in 1990 Turbo 2.0 liter, Bruce, Thu, 10 May 2007 08:00:17 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It is unlikely the ABS pump. If it was, you would get no brake boost, and that is a hard thing to miss.
By failing the Accumulator pump test, I assume you mean waiting for the pump to stop running, then hitting the brake pedal hard and fast until the ABS and Brake Fluid lights come on. Since the ABS light is always on, it would be when the Brake Fluid light comes on.Typically a weak accumulator comes on at 10 or less pumps; 5 or less for a really bad accumulator.
Replacing just the accumulator itself is relatively cheap. Maybe $150 or so.
Since the Brake Fluid light goes out but the ABS light never does, the problem is that the ABS is failing its turn-on self test. The only test the ABS system can run on the sensors if the car isn't moving is to see if they meet the proper resistance values. So most likely the reason the light is on is that one (or more) sensors is out of range. This can be a failed wheel sensor, a frayed wire, or as simple as the connector needs to be reseated. If you're moderately handy with an ohmmeter, open the hood, and remove the horizontal panel at the base of the windshield on the driver's side (Left hand drive cars). That's where the ABS computer is, and you'll see four in-line connectors - they look like short, fat black plastic pencils with a wire on each side. Pop them apart ONE AT A TIME; measure the resistance between the two pins on the side that doesn't go to the ABS computer (sensor side). They should be around 1200 ohms +/- 200 ohms or so. If one is really bad, you've found your bad sensor. The only recourse there is to replace it. Not cheap, but not that expensive.
I'd like to hear more details on how you perform the accumulator test. But your ABS pump is probably fine. IF the accumulator is bad, you want to replace it. First, because you could run out of brake boost if you're in a situation where you need to make a lot of hard stops in a short time. Second, because a bad accumulator causes lots of wear on the ABS pump, and that is an expensive part.
posted by 192.249....
, Thu, 10 May 2007 10:30:14 <-- Viewing This Message
, Thu, 10 May 2007 09:43:23
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