Tiburon Spells Trouble
The technician also did voltage-drop tests
on the TCM ground circuits, which came up good as well. The
battery, battery cables and alternator output were all normal.
So where to now?
The technician working on this car is a
knowledgeable one. He decided to plug a known good set of
solenoids into the vehicle harness outside the transmission,
grounding them directly to the negative battery cable. And
guess what – the codes were cleared and they did NOT
return.
Just as a test to confirm the fix, these
known good solenoids were installed into the transmission, and
the codes returned on startup.
The only explanation here is that a ground
problem exists in this vehicle somewhere, but when a job has to
go you have to use some logic. The technician figured that if
grounding the solenoids when they were connected outside the
transmission cured the problem, then grounding them when they
were inside the transmission also should cure the problem.
So how would one go about this? In
Figure 2, the technician is pointing out a new ground cable
that begins at the negative battery cable. Figure 3 provides a
closer view. The other end of the new ground cable was attached
directly to the transmission case as shown in Figure 4.
This did take care of the problem
permanently, but guess what – a month later, almost to
the day, another 1997 Tiburon came into this same shop with
exactly the same complaints!
Did a new ground cable cure this Hyundai?
You bet it did! Anything can happen in Trannyworld. 
©2006 Transmission Digest