i have a1985 1ton chevy pickup. i put a 700r in. it works great but no
overdrive. my question is Is there a certain rpm that it needs to shift
into o/d? i did not hookup the wires that go to trannydoes it need 12v
to lockup? the truck didnot have the wire to plug into the tranny.
On 18 Dec 2006 04:27:52 -0800, email@example.com wrote:
It needs a outside source for 12 volts to lock up converter. The ECM
normally supplies it. It is the only function on tranny that is
computer controlled. The for gear themselves do not need external
power source but converter lockup does. The best fix would be a
computer for a LD truck to handle this but then you would need engine
control that it monitors too.
Guess again, I have a 89 and I traced the circuit 16 years ago and it
is controlled by a signal from ECM. You need to get your ducks in a
row. The ECM monitors a lot of thing an the brake switch may break
circuit but it will not lockup on my burb without a signal from ECM.
You guess, I'll stick to the factory manuals and wiring diagrams.
Well go trace it again. 12 volts on the purple wire coming from
the brake switch, the tan/black wire is pulled to ground by the
ECM for lock up, the light blue wire from the ECM is pulled to
ground when the 4th gear switch closes telling the ECM that the
transmission is in 4th gear. Tracing wires doesn't mean shit if
you don't understand what is doing what.
Indeed. The TCC is controlled by the ECM, but the ECM does NOT
apply 12 volts to the TCC to accomplish lock up.
Ducks have nothing to do with it.
Has anyone ever sat you down and taught you how to read a wiring
diagram? Yes, YOUR truck's TCC needs the ECM to engage, but the
ECM pulls the circuit to ground, same as how the fuel injectors
are controlled, same as how the ignition coil is controlled, same
as how an air pump switching valve is controlled, it does not
apply 12 volts to the TCC solenoid as you state.
Oh, FYI, you CAN get the TCC to lock up on your truck without a
signal from ECM, all you need to do is ground terminal "F" in the
The fact that you didn't know this is proof that you have zero
idea how the circuit works or what methods can be used to
Again, you send people on wild goose chases.
So will l as I have factory manuals that came with 89 new but mine is
either altered in your mind or you do not know how to read yours.
There is no relay on my 89 for OD either. It is a solidstate SCR type
device that switchs power to it.
I read them just fine, proof is I've been fixing them for a
living long before your 89 was built.
But tell me, how did you get from; "I traced the circuit 16 years
ago," to; "I have the factory manuals that came with 89 new?"
Repair manuals didn't come with GM vehicles in 1989 or any other
year, and your story change smells like pure bull shit.
Between this and your idiotic notions about how an electric fuel
pump is wired, it's obvious that you couldn't explain how an
underhood light works.
Who said anything about a relay? Why do you even bring it up?
Your factory manual show that SCR, does it?
Not longer than me likely. Been around 4x4's since about 1960. I guess
my manual and burb was made in china because it is as I stated not as
you think it should be. GIven your past posts though you have a ego
problem so your responces are expected.
Since when is a published wiring diagram 'as I think it should
12 volts from the IGN/Gauge fuse, passes thru the closed brake
switch on the purple wire to the TCC solenoid, comes out of the
TCC solenoid on the Tan/Black wire which goes to pin A7 of the
ECM where the ECM switches it to ground when TCC apply is
Open your Chinese repair manual and read thru diagnostic chart
C-8. the whole thing is explained there.
The only person with an ego here is you Snojob, you repeatedly
insist on posting bogus technical information under the guise
that you've "been around something since blah-blah-blah", or that
your daddy invented it.
Hopefully, he'll post the part from the service manual that says;
The purpose of the TCC is to eliminate the power loss of torque
converter stage when the vehicle is in "cruise" condition.
This allows the use of an automatic transmission with the fuel
economy of a manual transmission.
Fused battery ignition power is applied to TCC solenoid through
the TCC brake switch. The ECM will engage TCC by grounding
circuit No. 422 to energize the TCC solenoid.
Engagement of the torque converter clutch will be executed under
the following conditions:
* Vehicle speed greater than 24 MPH.
* Engine temperature above 149*F (65*C).
* Steady TPS reading (not changing-steady road speed).
* Brake switch closed.
* Transmission in 3rd or 4th gear.
I know a verbatim quote from the repair manual hardly stands it's
ground against the word of someone who "traced" the circuit 16
years ago, but there it is, like it or not.
Vacuum switch and brake switch since that truck didn't have a 700 in it
before. He will need the terminals that break the connection to drop it
out of lockup. The switch he has only does the brake lights.
Switched 12 volts to a fuse(10 amp) goes through the vacuum switch and
down to the brake light switch. Then into the transmission.
Easiest way is to just buy the kit for about 70 bucks. They include the
wiring harness and parts so you don't have to track down the extras.
Also make SURE that the TV cable is adjusted right, unless you want to
burn that trans out.
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