Trying to scan ABS codes on 99 Dakota with Snap-on scanner

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noname - 02 May 2005 17:06 GMT

For some reason all I get is no communication, engine and tranny works fine
but "body" and "abs" no response.

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Tom Lawrence - 03 May 2005 00:37 GMT

> For some reason all I get is no communication, engine and tranny works
> fine
> but "body" and "abs" no response.

Well, there's no body control module on a Dak, so that's out. And as far as
I know, the ABS system is dealer-proprietary - only a DRBIII can talk to it
(every independent shop I've talked to has always said 'dealer-only' when it
came to anything to do with the ABS system)

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TBone - 03 May 2005 13:51 GMT

IIRC, the manual for my RAM said that you need to use a breakout box and
jumper a few pins to communicate with the antilock brake controller.

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> > For some reason all I get is no communication, engine and tranny works
> > fine
[quoted text clipped - 4 lines]
> (every independent shop I've talked to has always said 'dealer-only' when it
> came to anything to do with the ABS system)

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Tom Lawrence - 04 May 2005 00:05 GMT

> IIRC, the manual for my RAM said that you need to use a breakout box and
> jumper a few pins to communicate with the antilock brake controller.

I know that was the case with the '94-'97's... I don't know if it carried
over to the newer ABS systems. In fact, now that I think about it, a
buddy's '98 1500 with 4W ABS had a problem... he took it to several places,
and they all told him the same thing: "dealer only - nothing we can do". We
did what we could, troubleshooting the wheel sensors (all checked out good),
the brake switch, bled out what we could, etc. Never could determine the
problem - so he sold it :)

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noname - 04 May 2005 15:50 GMT

Well, the output shaft sensor seems to be working according to the scanner.
Funny thing is that the speedometer jumps around alot under 25 or so mph.
On the lift with the truck in gear the speedo doesn't move until after 20-25
mph even though the output shaft sensor reading varies directly with
observed shaft movement.
I'm thinking rear wheel sensor. There is only one and it is mounted on top
of the rear end pumpkin.

> > IIRC, the manual for my RAM said that you need to use a breakout box and
> > jumper a few pins to communicate with the antilock brake controller.
[quoted text clipped - 6 lines]
> the brake switch, bled out what we could, etc. Never could determine the
> problem - so he sold it :)

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Tom Lawrence - 04 May 2005 23:31 GMT

> On the lift with the truck in gear the speedo doesn't move until after
> 20-25
> mph even though the output shaft sensor reading varies directly with
> observed shaft movement.

Aw, heck - if you would have said that to begin with... :) Yeah, classic
symptoms of a failed rear wheel speed sensor. Speedometer reading comes
from this sensor (via the ABS controller) - not the trans output sensor.
ABS+brake lights+funky speedometer == bad RWSS.

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noname - 05 May 2005 13:01 GMT

Thanks Tom!

> > On the lift with the truck in gear the speedo doesn't move until after
> > 20-25
[quoted text clipped - 5 lines]
> from this sensor (via the ABS controller) - not the trans output sensor.
> ABS+brake lights+funky speedometer == bad RWSS.

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