bigdreynolds

I have an 03 Screw FX4 . I recently lost 4 low .
Has electronic shift on the fly .
Foot on break , in neutral .
It clicks in dash when put into and out of 4 hi but don't hear anything when trying to put in 4 low .

I've changed transfer case , shift motor , 4 wheel drive switch , 4 wheel drive shift module in dash , changed solenoids on firewall , checked all fuses and relays that I can find .
I can take shift motor off and manually put it in 4 lo.
I'm at my wits end here !

ABS light is on ..... would that have something to do with it ?
Thanks in advance . Donny

djfllmn

iTrader: (1)

whats the ABS code? If you are getting a faulty speed signal i could see that causing it not to go into 4 low.

white89gt

FTY - The relays for the transfer case are under the dash, not on the firewall. The firewall relay is only to engage the front axle. I have pics somewhere that are better than this one - but this will give you the idea....

white89gt

Alright.... found it. This is under the top piece that goes over the instrument cluster..... Not guaranteeing this is your problem, just telling you the proper location.

EDIT: Does it ever just randomly have relays clicking under the dash for no reason? Do you have other weird "gremlins" right now? Generally t-case shift issues, ABS issues, drained battery, problems with the wipers, etc. can be indicative of a wet GEM module.

bigdreynolds

Codes are
Secondary controller ABS

C1155 - left front speed sensor input circuit malfunction
C1230 - wheel speed sensor rear center input circuit malfunction
C1237 - wheel speed rear input signal missing
C1158 - left front speed sensor coherency malfunction
C1129 - rear speed sensor center coherency malfunction
B1229 - battery pack voltage out of range

SECONDARY CONTROLLER GEM/CTM
B1450 - upshift selector / wheel plus switch malfunction low input

I hate ABS so I never worried about fixing these things . As long as the ABS light is on I can stop but when it use to go out every now and then I pretty much had no breaking ability . ( I haul heavy loads all the time)
Donny

bigdreynolds

Yes I changed them as well . Thought it was the 4 wheel drive module .
Everything else works as is should ( except ABS ) no strange noises or clicking.
Donny

djfllmn

iTrader: (1)

Holy fault codes...i wonder if you have a wiring issue or a GEM issue or even a CJB issue but first...wiring test time

bigdreynolds

The rear one might be a wiring problem , I pulled wires apart while loading a 4 door long bed diesel truck on my trailer. It picked rear of truck clear off the ground . That was a very slow drive to the shop with that one ! I did fix wires ( with butt connectors )

djfllmn

iTrader: (1)

my recommendation to you. Stop with the parts cannon and take it to someone with the proper scan tool/diagnostic skills and let them figure it out

techrep

iTrader: (1)

ABS is the key here.. fix it and fix your 4L problem. I'll bet it has not worked since the ABS light has been on.