1989 240sx: ECU Pins

[BlackHat]

I'm trying to figure out a couple of pins so that I can continue my MSEFI installation. Any help would be greatly appreciated.

Pin 4:This one worries me because it appears to be the signal wire for the ECCS relay (aka Main or EFI relay). It appears to be the signal for the relay to give power to the ECU, CAS and MAF. Anyone have more info on this wire?

Pin 29:This looks to me like power is being fed from the ECU to the CLT, IAT, TPS, and the Exhaust Gas Temp sensor. Or is this merely a ground through the ECU?

Pin 36:Connected to the Ign Sw, Coil, condenser and console. My thought was this was a power feed from the Ign Sw. Which would make this switched power for the ECU?

Pin 43:I'm at a loss on this one. Power Steering Pres. Sw?

Pin 44:Connects to the Throttle Valve Sw. I guess i big question here is what is the Throttle valve Sw? I already pulled the wires for the TPS, so I'm not sure what this one is for.

The black wires listed on the wiring diagrams wouldn't happen to be grounds would they?

Any input on any of the mentioned wires would be appreciated. Thanks!

[BlackHat]

Thought I'd clear up some of this (i found out some anwsers on my own).

Pin 4 as mentioned is just a signal wire. I'm not quite sure how it was designed to work, because the ECU has a switched power supply from Fuse L. However, this wire obviously needs to ground out before the Injectors, CAS, etc. can get power.

Pin 29 is a ground. I would assume the line is run into the ECU so it can get a more accurate signal as it controls the ground.

Pin 36 actually has no importance to me hooking up a MSEFI. All the other devices are grounded out on their own. I would assume this just monitors the ground of these devices for a reference. A lot like pin 29.

Pins 43 and 44 still baffle me. They are currently considered useless for me until I can find out more info on the devices they control. Any help on these would be greatly appreciated.