|
The
lock up TC circuit is a ground switching system. The ECU grounds the
circuit to control the operation of the TC. So in order to install a
switch to force lockup all you have to do is hook up a grounding circuit.
1)
Locate pin #53 on the ECU. They are numbered on the ECU.
2)
Tapp into the pin #53 wire in the engine management harness.
3)
Run a wire from the pin #53 wire to a switch, then from the other side of
the switch to a good ground. I ran mine to the negative battery terminal.
Note:
Haynes manual says the wire is Pink and Yellow but mine is Orange. You can
verify the wire color by looking at the TC plug on the transmission.
Now
you can control lock up. When the switch is in the on position the lock
will stay locked up regardless of engine load as long as the transmission
is in 3rd or OD.
When
the switch is in the off position the lock up will operated as it always
did.
Note:
There is no lock up in first or second. The valve body overrides it in
those ranges. Also remember to turn the switch off when coming to a stop
or the engine will lug down until the transmission drops out of 3rd gear.
Benefits:
You
can force the TC to stay locked in 3rd and OD. When you take your foot off
the gas in 3rd or OD the TC unlocks and then relocks once the gas pedal is
pushed down. IMO this causes un necessary wear and heat. With this switch
set up once turned on the TC will not unlock until you either turn it off
or shift into 2nd gear.
|
