I am asking for some help with this.
I have a 92 roadmaster wagon with 197,000 on it. The ABS light just
came on. How do I isolate which sensor is defective?
I can disconnect each sensor and I believe I can put a meter on the
terminals. Any idea what I should be reading?
A general question is - How to troubleshoot the ABS system in any car?
Thanks for any help
Well I guess the first question that needs to be asked is how do you know
it's a bad sensor? Even in a vehicle from '92 it could still be a bad
circuit/wire, control module, ABS pump, etc. I guess what I'm trying to say
is instead of concentrating on just the wheel sensors you should just go
have the computer scanned to see what it really is or may be, and if it
turns out to be a bad sensor then it may tell you exactly which one instead
of trying to find it yourself.
Good luck - Jonathan
He can do this one himself. Short pins 'H' and 'A' on the ALDL connector,
turn ignition on. ABS light will flash codes.
1. Read codes.
3. Test Drive.
4. Read Codes.
Report back with your findings.
Well, I really want to thank you guys for showing me where to start
I have finally had the time to do some research on my ABS problem.
The ABS light is now always on instead of being intermittent.
The error code is 25, which I have found on the web as being "Left
Front Speed Sensor Fault".
My intensions are to clean the connector contacts and clean the sensor
area to remove any dirt which my interrupt the magnetic flux. I will
most likely do a resistance check on the sensor since I will have it
Anyone have other suggestions?
Thanks Again -- Dan
Give it a try Dan, but don't be surprised if it does not work. You've got
maybe a 50/50 chance. You may find you have to replace the hub assembly
because the sensor is inside the hub.
Before jumping on the hub though, check the integrity of the wire from the
connector down on the A frame, up into the engine compartment. I don't know
where it runs to on your car - you'll have to trace it or research its
routing. It's not completely uncommon for the wire to corrode and fail.
On this particular vehicle, the front wheel bearings are not the sealed unit
type. The ABS wheel speed sensor is independent of the wheel bearings.
Still check all the wiring, but check the continuity of the sensor itself
first. It's a quick and easy task that could save you a lot of time
troubleshooting wiring that's not at fault.
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