Help on finishing LT1 wiring - Fan and Torque Conveter

[Guest Craig280z]

Can anyone tell me where to hook up the radiator fan and the torque converter to the computer

on a 95 LT1 from a Firebird?

 

Also, how does the port hook up that allows access to program the computer. I still need to hook

that up too so I can use LT1 edit and adjust everything.

 

Other than that, my car is ready to roll!!

 

Man that sucker flies. Even with the open 3.7 differential and 195/70/14 tires, it is pretty quick.

 

Thanks,

Craig

[Tim240z]

Craig,

The fan is hooked up by using the wire from the PCM to the Earth on the fan relay (the PCM provides a ground to complete the circuit).

Sorry don't know about the auto Trans.

All you need from the PCM for the DL connector is the 'serial data' line and the earth. Make sure you have a good ground for the earth.

If you don't have a diagnostic connector, just about any OBD1 GM car is compatable. I got mine from a Cavalier. Can't remember for sure which pin the serial data goes to, but I think it's the "M" pin on the plug.

BTW, mine is a 94 Z28, but I would imagine the wiring to be the same.

Tim

[Guest Craig280z]

Hey Tim,

Thanks for the reply.

 

Any idea which wire from PCM goes to the fan?

 

Thanks,

Craig

[Tim240z]

Craig,

Depends. There is a primary and secondary fan wire (if running dual fans). I believe the primary one (I am only runnning 1 fan) is the # 16 green wire from the red PCM connector,but I am doing this from memory. I can check my FSM manual this evening. Both wires for the fan are green!

Tim

[Tim240z]

Ok Craig, Here you go!

 

Data Link Connector (DLC):

Cavity "A"= Ground (Blk/White)

Cavity "B"= Diagnostic Request (White/Blk)

Cavity "G"= Program input, keyless entry module

Cavity "M"= Serial Data Line

 

Fan Wiring:

Red PCM Plug:

Cavity "10" Secondary fan relay control (DK Blue)

Cavity "11" Primary fan relay control (DK Green)

 

Remember, these fan wires provide grounding, not power for the relay.

 

Hope this helps,

Tim

BTW, while I have the FSM out, here's the auto trans wiring:

Black PCM plug:

#7 (lt grn) 1-2 shift control solenoid

#13 (gry/wht) 3-2 shift control solenoid

Blue PCM connector

#2 (Lt blue/wht) pressure control solenoid low

#11 (tan/blk) TCC solenoid control

#28 (yel/blk) Trans fluid temp sensor signal

Clear PCM plug:

#15 (orn/blk) PNP [park/neutral position] sensor

#16 (red/blk)pressure control solenoid high.

[Guest Craig280z]

Tim,

 

If you don't mind, I would appreciate it if you could check for me.

 

I have only one fan and it is a single speed Taurus fan.

 

The car is running very cool with the Griffin radiator, even in stop and go traffic on a 95 degree Alabama day. I am pleased with the cooling system.

 

Thanks

Craig

[Guest Craig280z]

Hell Yes!

 

Thanks Tim.

 

BTW, I love your gauges. What series are they and did you get an electronic speedo?

 

Thanks

Craig

[Tim240z]

Craig,

You're welcome. At least I know that I'm getting my money's worth out of the FSM!!

 

My gauges are Autometer Ultra lites. Originally I bought a mechanical speedo (back when I was doing the Carb/automatic trans setup), but I sold the speedo and trans temp gauge and just last Thursday got me new electronic speedo from Summit. I had soiled underpants issues when I saw the price on those things!!!! $200 for a bloody speedo....outta control, but I paid it

 

Tim