98 Dodge truck 1500 4x4 Quad cab short bed, Gasoline 5.2L (318 ci.)
4-speed Auto w/overdrive with 60k mi.
Bought the truck new in 98 - 1st year was ok. Started pulling a tiny
tent trailer in 99 and noticed on long hauls that the torque converter
was locking & unlocking every time I hit a small or large bump. Took
it to the Dodge dealer many times (more than 8 times) for this problem
but they could not find anything wrong. The dealer said it may be a
short in the electrical system somewhere but each time could not find
After the warranty has expired it still continued to do this a few
times a week.
Since May of this year I changed jobs and now have a daily commute on
the freeway at sustained speeds above 55 mph. Now the TC is
unlocking/locking on every bump sometimes every couple of seconds. I
have scanned this newsgroup for help many times and also
www.dodgeram.info.com and have tried to track it down.
I got out the voltmeter and checked the throttle position switch and
brake light switch. They were both ok.
Re-routed the spark plug wires so there was no induced current in
other nearby plug wires.
Cleaned the battery and the frame ground wire.
Checked the manual 3-key on/off sequence to look for any error code.
No error code.
Tried to follow the instructions on forcing the PCM to lock the TC by
running a wire & switch off of PCM pin #54 but could not do it because
the PCM wiring was not labeled.
This week, I manually switched off the overdrive before getting on the
freeway and at 55+ mph the TC still locked and unlocked. This is
with the OD switch off!
Summary: Now remember this locking/unlocking has only occurred when
the truck goes over a bump or encounters a sudden change in wind
Now for my question(s):
Is there a fuse or a way to disable the transmission solenoid for the
overdrive lockup (like the manual OD on/off switch should have done)
so I can test to see if its 4th gear or not instead of the OD (TC
Does anybody have a sketch diagram of the PCM wiring plugs so I can
locate Pin #54?
Does anybody have a sketch of the transmission showing the TC solenoid
so I can pull the pan and check for a broken wire?
Anyone have this type of problem before?
End of questions
If you don't know, don't guess!
Dodge owner since the mid 70's