Ric1

Hi guys just got an 88 xj the transmission won't go in drive but wiil shift smoothly through 123, I don't know auto transmissions from a hole in the wall any help would really appreciated thank you ahead of time.

cruiser54

Clarification please. It shifts up through 3rd if you shift in manually, but if you put it in D, it won't go?

If that's the case check the fuse to the Trans Control Unit aka TCU,

Ric1

Yes that's what going on and thank you for the reply I'll look into that fuse.

cruiser54

Let us know what you find.

Ric1

Unfortunately that fuse was intact but they had 10 amp fuse in it! Still looking.

cruiser54

The tCU may have failed.

But, check to see you have voltage at both sides of the fuse with the key ON.

Jadon Farleigh

cruiser54

Not that old a thread. Check your tCU fuse and do Tip 10 and Tip 1 at www.cruiser54.com

Rikrdolevy

Did you manage to fix it?

My mech cannot seem to know what the problem is either as he did a trans overhaul and it is still the same. He is assuming there is a crack inside the trans itself and it is not keeping the presure inside but he is not certain about it.

If you had any luck please let me know.

cruiser54

See post 8.....

smooth move

try a new TPS. that fixed mine when it wouldn't shift.

caged

me too. i keep telling everyone but they think it's hard to believe. i even swapped transmissions before i swapped the TPS.

cruiser54

Why not diagnose it?

Check the fuse first. It can be a bit corroded and cause these symptoms.

Failing to do Tips 1 and 10 can do the same.

Rikrdolevy

Nothing to do with electrical, i just had that checked. The trans has been overhauled but it still not shifting

cruiser54

How did you "check" the electrical. The trans is electronically controlled. How can it not be electrical?