I looked but didn't find an answer
Both the brake and antilock brake light stay on. I jumped the DIA connector and got the code 7 on the RWAL
7-Electronic control module fuse pellet open, isolation output missing, or valve wiring shorted to ground

Can any one help me figure out what do.
What is the fuse pellet? Is it the fuse? What fuse?

Please help get the

 

I know of something it could be and might be a quick fix there is a little sensor on the rear diff for your abs brakes its put in such a spot that rocks and mud can easily knock it off or rip it off causing those two lights to come on and leaving you with no abs brakes I know my truck has this problem and found out about it when I had the truck inspected for my insurrance hope that helps man. I don't know the part numbers of the sensor or mount so maybe try looking around again on here cause I am sure others have gone through the same problem I have seen many 1st gens with the same light on and also it doesn't just affect the diesel variants of our trucks so try searching in google

 

The fuse pellet is located inside the ABS control box. "Isolation" is referring to the isolation solenoid in the hydraulic unit on the rear frame. Either the solenoid, or the wiring to it is shorted.

 

Got a new module because looking for the fuse pellet I let the smoke out. Anyway I am getting the same error. Can any one tell me how to test the solenoid. I tested it to ground and nothing.

 

I'd like to know also. My light had been on ever since I shelled the rear diff. Replaced the hall effect sensor and the dump valve is fairly new....

 

I tried a new dump valve but no go. no shorts to ground in the wiring or the dump valve . lost

 

Check the vacuum sensor on the fender, if it fails it also faults the system.

Mark.

 

whats it look like?

 

It's a round can with a 3 bolt bracket.
The smaller vacuum line off the brake booster valve runs to it and it has an electrical connector on it, as well.

Mark.

 

Try bypassing the trucks wiring and power the isolate and dump valves at the hydraulic unit. That will tell you if it is a wiring issue.
The black wire is the ground, the green wire is the isolate solenoid, and the white wire is the dump solenoid on the harness that plugs in. The light blue wire is for the reset switch in the hydro unit. If the hydraulic unit works there, then power it from the ABS control unit connector. They are the same color at that end.

 

What pin is the main power? I thought it was 3 off of fuse RWAL fuse but If I pull that module still has power.

Also what is the main ground on the module I don't see a ground out all.


I discounted my harness at the blue connector by the column and I still get the same code Number 7 now change I am thinking it is the new/used module or maybe a bad ground to the module.

 

Unfortunately I can't get the wiring diagram to load. Did you check this FAQ? https://www.dieseltruckresource.com/...ad.php?t=59092

 

Ya I looked there no help. My schematic showes

pin
1 IS1 isolation valve
2 AT1 the E of message center
3 20amp Fuse #9 also ts fuse
4 to 4wd ind
5 to J of message center also park park
6 to L of message center also vac sensor
7 to stop light switch nc same location as a reisitor

8 DS1 dump valve
9 to stop light switch nc same location as the buzzer
10 to intermittent wiper
11 VS1 reset switch
12 Dia connector
13
14 13 and 14 twisted pair to sensor

I have disconnected both the sensor and valve and unplugged the module (to reset code) it still has 7 blinks with nothing hooked up. I have tested the wiring for shorts and none.

I believe the used module is bad. Because the error code does not change.

But not sure if it might not be a power issue to the module but have know idea what is ground and true power.

 

Pin 3 is power, pin 10 is ground. The ground is shared with the wipers.

 

Got power on pin 3, ground on pin 10. Valve has no shorts or opens. All sensors are working fine I quess the means my used module is bad also. Man i hope I am right if not abs might just come out.

Thanks for all your help.