Need help troubleshooting an issue with my WTECII

[spankybear]

So I got the truck up and running after worked through a starting issue. I can select Drive, Revere , and the truck will move. I can select first (1) when the truck is sitting you can feel the trans shift from 2 to 1. I can also select mode.

The problem is when I start out and speeding up to the point where I think it should shift the "select" side numbers goes dark but the "monitor" side stays on 2. At this point the touch pad is not responsive. The truck is still driveable but stuck in 2nd gear. I was thinking that maybe the TCM isn't getting a speed sensor input but my speedo seem to work fine and smooth (well to 10 MPHish)

Anybody have any ideas? I have had this dash apart doing body work and kept the TCM in the garage.

 

[NDT]

In case you don't have it.

 

[Kbarnes0]

Just to check since recently In your other thread you mentioned it had been a while since it ran. Batteries topped off and alternator charging?

 

[spankybear]

Just to check since recently In your other thread you mentioned it had been a while since it ran. Batteries topped off and alternator charging?

Yes sir the batteries are all charged up and the charging system was working. The starting problem I was having was relay K2 being intermittently bad.

I am sure there's a connection issue somewhere. The cab was open to the elements (under a tarp) for some time with all of the wiring.

 

[Coffey1]

Low batteries or low oil in trans.

 

[Floridianson]

Got to pull up them codes to start with if you can.

 

[Andyrv6av8r]

Low batteries or low oil in trans.

As Coffey said, mine did the exact same thing and it was low fluid. It took a few days of troubleshooting to figure it out.

 

[Andyrv6av8r]

Read this thread.

Is an Engine Speed sensor necessary?

Is an Engine Speed sensor necessary? Answer in post 56. I have an issue with my 1997 1078 that I can't figure out. About a month ago, I started on a drive in the 1078 and the transmission stayed in 2nd gear before I went 15 feet with the 7 disappearing from the left side of the shift pad. I...

www.steelsoldiers.com

 

[Suprman]

The trans uses a speed sensor on the side of the bellhousing by the scav pump for input speed. There is a key shaped sensor in the transfer case for output and a throttle position sensor on the motor. If you have ruled everything else out I would take out the trans control they come out a sone piece. Then separate the keypad from the tcm and see if moisture got in there. If so let it dry and see what happen.

 

[Floridianson]

As Coffey said, mine did the exact same thing and it was low fluid. It took a few days of troubleshooting to figure it out.

And a long thread.

 

[spankybear]

First off a big thanks for the WTEC II manual! and the info!! I had no idea how to pull codes out of the TCM.

Code is the infamous 25 11 rabbit hole. So before I go to deep I checked the oil. There are 3 marks on the stick. Cold full, Hot add and Hot Full. IT is at the Hot add mark. I only ran the engine for a couple of mins and the oil was not hot. How much dose the oil expand? Or maybe how accurate it the marks?

I only tested the batteries with a volt meter and they read between 12.7 to 12.8 volts with the truck off. This should be full charged and the truck starts fine. I know the 2 12 volt side batteries are fully charged as I had them out of the truck and on the charger. Maybe I should get the other 2.

I am still not going to rule out a bad connection as like I sad I had the cab open for awhile with no windshield and rust repair. Even with a trap things get damp up here in the northwest. The TCM was NOT in the truck but in my garage during this time. It was not subjected to a damp place.

For oil what are you people running? Rotella or Delo?

 

[Suprman]

The connectors can slip out of the back of the trans control when you are putting it back in. There are tabs that lock the two of them in place sometimes they break off or just dont lock in all the way.

 

[Coffey1]

Rotella

 

[spankybear]

I am going to start simple... First I will take out each battery and charge them up one at a time. It will be a couple of days as I only have one smart charger. I'll report back when I am 100% sure all battries are at 100%. Could it be this simple?

 

[Coffey1]

My alternator quit working
Headlights run batteries down
And it stayed locked in 2nd

 

[Ronmar]

Any other codes besides 25-11? It can store 5 codes I think?

 

[spankybear]

Any other codes besides 25-11? It can store 5 codes I think?

Not that I saw.

 

[coachgeo]

Hmm... Good batteries bad 24v connection? Clean all terminals and clean terminals on the polarity box and see if any change?

 

[spankybear]

Batteries charged up and no joy... I added some oil to bring the level up a bit.... No joy... I know what I am doing next weekend. Going to check the connections. Don't think its the output speed sensor. The speedo works and if I am reading the prints right the speedo signal goes through the TCM.

Grrrrr

 

[NDT]

You are on the right path. Ohm out the wires associated with the speed sensor at both the transmission and at the TCM. The Allison manual gives the ohm values.