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Apr 28, 2010 | 04:58 PM

#16

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

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From: Concord, NC

Quote:

Originally Posted by Lazy K

You can correct me if I`m wrong but you are correct for RABS1 but I think RABS2 does store codes.
Right? Wrong?

I'm sure my '87 is old enough to have RABS1 and it does not store codes, so I had that on my brain. I'm not very familiar with RABS2, so I assume you are correct about the code memory. When did Ford make the switch to RABS2?

Apr 29, 2010 | 04:03 AM

#17

Lazy K

Post Fiend

Joined: Jan 2005

Posts: 8,402

Likes: 10

EPNC, my `87 is RABS1 also and does not store codes. The ABS light has to be on before grounding the diagnostic connector and as you say all codes are lost when the ign switch is turned off.
AS I understand it RABS2 was introduced around `93 (but could be wrong, may be later) and does store codes.

Apr 30, 2010 | 01:25 PM

#18

njtinman2

Thread Starter

Mountain Pass

Joined: Nov 2004

Posts: 215

Likes: 0

From: nj

wow noone else with any info hasnt anyone ahad to deal with a problem like this?

Apr 30, 2010 | 01:31 PM

#19

Hitokori

Posting Guru

Joined: Nov 2009

Posts: 2,244

Likes: 1

well u could just use a BFH and beat the s*** out of it until u feel better....

my truck has the same deal with the both the lights on...

my float floats and the brakes are good and it has fresh brake fluid

so that leave a bad control module float sensor or sumthin else.....

i really dont know and ford is a dumb *** for putting abs on the rear any way it should be on the front

if i knew how i would take all that off and just have the brake light on when the parking break was applied

anyone know how to do that? ill give u a cardboard cookie if u do

Apr 30, 2010 | 03:25 PM

#20

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,668

Likes: 301

From: Easton,Ks

Quote:

Originally Posted by njtinman2

wow noone else with any info hasnt anyone ahad to deal with a problem like this?

Code 4 is generated by the module's detection of a resistance falling below 18k ohms (short) or above 26k ohms (open) in Circuit 535 (LB/R). This can indicate an open or short in the reset switch circuit, or a hydraulic leak into dump section of the valve.

Possible Contributing Base Brake Component/Vehicle Wiring Concerns

Terminal backout in the module harness connector at Pin 6
Terminal backout in the RABS valve harness connector at Pins 2 or 3
Bulkhead connector (between engine compartment and instrument panel) terminal backout or loose connection
Module or RABS valve connectors not fully matted with component
Intermittent open or open circuit in Circuits 535 (LB/R), or 274 (BK/W)
Intermittent short or short circuit in Circuit 535 (LB/R)
Defective anti-lock brake control module

Apr 30, 2010 | 04:41 PM

#21

EPNCSU2006

Lead Driver

Joined: Nov 2002

Posts: 9,557

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From: Concord, NC

Quote:

Originally Posted by Hitokori

i really dont know and ford is a dumb *** for putting abs on the rear any way it should be on the front

If ABS is implemented on one axle only, the rear is where it must be - never only the front axle. Ford would have had a few million lawsuits and a big recall if they had done front-only ABS. If the rear end locks while the front has grip, the vehicle will swap ends very easily. Rear-only ABS keeps the rear end in line (when working properly, obviously), even if the front end locks up and loses grip. Four wheel ABS gives the most driver control in maximum braking situations, but rear axle-only ABS is a decent compromise, especially for the technology available 23 years ago.