[solved] I’m in the middle of nowhere right now and have multiple faults.

[sandy_koufax]

Truck on start up gives the following faults:
- service advancetrac
- hill start assistance fault
- pre collision assistance fault
- service steering
- low tire pressure (this one is international)

The app gives me the following faults:
- electronic power steering has detected a fault.
- hill start assistance has detected a fault
- collision warning system has detected a fault or obstructed sensor

Truck while driving intermittently goes into some kind of electrical limp mode, reduces the fans and I think reduced the brightness of the screen. I forgot the error it gave.

No power steering. At first I thought it was some loose fuses which was just a coincidence. Power steering came back but then at next start up went bad again.

I’m in the middle of a national forest and at minimum 30 miles from the closest human. A tow truck likely couldn’t get here since we did some minor rock crawling. I can probably get the truck home, but we’ll be here until Sunday so any help is appreciated. We have tools but no code reader.

I do have a bunch of electrical auxiliary's stuff hooked up but I don’t think there’s a ground short anywhere. I checked all the wires.

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[airline tech]

Rock Crawling - Check all visible connectors that may have been hit by rocks, mainly the (EPAS) Steering.
Did you go through any deep water, if so you may water (wet) the High Current fuse box or the BJB or water ingress into the (EPAS) connector.

You mentioned (Aux) - Is that fuse tapped into fuse #19 - BJB, if yes that may be the problem as that is the (PSCM) the electric control of the steering gear.

I would also check all (ABS) wheel speed sensor connectors and the 2 main harness connectors on the LH Frame rail (below the driver's door) Just as a precaution as these have nothing to do with EPAS power - which I believe is the (primary) fault.

I would primary focus on Fuse #19 - pull and inspect for corrosion and if tapped source (remove) that tapped power, and check the (EPAS) connector and associated harness.
For Ref: Fuse #19 and Fuse #2 (The 125-Amp) fuse sitting on the Battery Fuse Link - feed the EPAS gear so check that connector that connects to that fuse (125-Amp) The 125-Amp fuse feeds the motor of the gear.

 

[Glocker]

When this happened to me, it was because the hose that holds the fan clutch position sensor whatever dohicky disintegrated.

 

[samsd]

Check a wire that may have been cut by the front fan pulley. Can cause a whole lot of wonky.

 

[Dereku]

Any update? Hope you are safe and get it sorted out. Check all wires and plugs on the underside. Probably snagged something.

 

[sandy_koufax]

Rock Crawling - Check all visible connectors that may have been hit by rocks, mainly the (EPAS) Steering.
Did you go through any deep water, if so you may water (wet) the High Current fuse box or the BJB or water ingress into the (EPAS) connector.

You mentioned (Aux) - Is that fuse tapped into fuse #19 - BJB, if yes that may be the problem as that is the (PSCM) the electric control of the steering gear.

I would also check all (ABS) wheel speed sensor connectors and the 2 main harness connectors on the LH Frame rail (below the driver's door) Just as a precaution as these have nothing to do with EPAS power - which I believe is the (primary) fault.

I would primary focus on Fuse #19 - pull and inspect for corrosion and if tapped source (remove) that tapped power, and check the (EPAS) connector and associated harness.
For Ref: Fuse #19 and Fuse #2 (The 125-Amp) fuse sitting on the Battery Fuse Link - feed the EPAS gear so check that connector that connects to that fuse (125-Amp) The 125-Amp fuse feeds the motor of the gear.

Thank you for writing this. I was really hoping you’d have something to say today and you didn’t disappoint. You were right last time about my BJB being bad causing the car to be stuck in 4L. Took the dealer months to figure out what was wrong.

Thank you everybody else for your suggestions as well!

I tried all of them one by one, very meticulously, to no avail. Then eventually we decided to just pull the battery overnight and let everything reset. During that process we noticed one of the bolts in that tetris thing connected to the battery negative terminal was broken and sometimes lost contact. Jammed a beer can tab in it and suddenly everything was working. We zip tied it and it’s holding fine. It’s this very large yellow/red cable. Very much looking forward to not having to deal with a dealership. We’ll extract the bolt back home.

 

[airline tech]

Awesome - for a reference - The Red/Yellow cable feeds the PSCM, So I assume it was location (E)

 

[5thranger]

Awesome - for a reference - The Red/Yellow cable feeds the PSCM, So I assume it was location (E)

I thought he said the negative terminal he must have meant positive terminal.

 

[Dereku]

Beer can tab fix is awesome! Great ingenuity and strange part for a break on the trail. Glad everything worked out for you.

 

[sandy_koufax]

I thought he said the negative terminal he must have meant positive terminal.

Awesome - for a reference - The Red/Yellow cable feeds the PSCM, So I assume it was location (E)

Do you by any chance know which relay I put in the wrong place? I was swapping relays to see if that was the issue but I guess I forgot to put it back in the right place. I also didn’t realize some of them are GA and some are HA.

4wd is not engaging.

 

[RangerBill]

Do you by any chance know which relay I put in the wrong place? I was swapping relays to see if that was the issue but I guess I forgot to put it back in the right place. I also didn’t realize some of them are GA and some are HA.

4wd is not engaging.

Both bottom left relays should be HA relays. You have a GA there. You have an HA top right (should be a GA). Bottom Left should be an HA relay.

Swap the bottom left relay with the top right relay.

 

[sandy_koufax]

Both bottom left relays should be HA relays. You have a GA there. You have an HA top right (should be a GA). Bottom Left should be an HA relay.

Swap the bottom left relay with the top right relay.

That fixed it! Thanks for the quick reply.

 

[Deleted User 38384]

Beer can tab fix is awesome! Great ingenuity and strange part for a break on the trail. Glad everything worked out for you.

No shit ?
I buddy of mine converted an old school bus into an RV / Motorcycle hauler. His radiator developed a few leaks right before the trip home from a big race weekend in West Virginia. So he got 10 gallons of water and 2 dozen eggs. Once the radiator got up to temp,,, he would drop in 3 eggs and they would cook and seal up the leaks for about 50 miles. Then, he would have to do it again. Smelled horrible but it worked. He got it home.... with scrambled egg everywhere in the engine bay. ? That guy was a genuine hillbilly MF'r.

 

[Deleted User 38384]

Rock Crawling - Check all visible connectors that may have been hit by rocks, mainly the (EPAS) Steering.
Did you go through any deep water, if so you may water (wet) the High Current fuse box or the BJB or water ingress into the (EPAS) connector.

You mentioned (Aux) - Is that fuse tapped into fuse #19 - BJB, if yes that may be the problem as that is the (PSCM) the electric control of the steering gear.

I would also check all (ABS) wheel speed sensor connectors and the 2 main harness connectors on the LH Frame rail (below the driver's door) Just as a precaution as these have nothing to do with EPAS power - which I believe is the (primary) fault.

I would primary focus on Fuse #19 - pull and inspect for corrosion and if tapped source (remove) that tapped power, and check the (EPAS) connector and associated harness.
For Ref: Fuse #19 and Fuse #2 (The 125-Amp) fuse sitting on the Battery Fuse Link - feed the EPAS gear so check that connector that connects to that fuse (125-Amp) The 125-Amp fuse feeds the motor of the gear.

I'm writing down your name in case I blow something up. You'll be my 1st contact.

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