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Originally Posted by
www.justih.com WERTY'S WAY IN "RED"I don't run the ign from the switch. Due to voltage drop I run all switched 12vdc thru the relay.
I did voltage drop is not that bad.10GA PINK WIRE I HOOKED UP TO THE CMH (Cold Mixture Heater) relay. THEN USED A 30AMP BREAKER IN-BETWEEN.
THERE IS A BLUE WITH RED STRIPE THAT GOES TO GROUND HOOKED IN THIS RELAY That has to be cut from the computer conector for the smog computer
if you use a bosch style relay here are the pins:
30-12v fused input(should also hook up your org ECM constant 12v to this wire)
85- Gnd
86- 12vdc from ign sw(black wire that was hooked up to the coil +)
87- pink/blk, pink(ignition, ecm power)
87- red, white(injectors)
there are 2- 87 output terminals on the relay so you can use both.
There are several places the pink/blk branch off to.
I have also used a terminal strip and just run the sw 12vdc from the relay to the terminal strip and connect the other loads to it.
I use the Toyota black yellow switched for this.So to start out we will go right down the line in order.
A1- grn/wht- this wire is used to energize the fuel pump relay.
This turns on the fuel Pump for 3 to 4 seconds.A2- not used
A3- not used
A4- gry- to EGR relay.(optional) This is a ground from the ECM to control the EGR relay.
My truck dosent have this.A5- brn/wht- SES(service eng soon) light. This is a ground to turn on the light.
I wired in a little l.e.d.for this.A6- pnk/blk- switched 12v from the ignition relay.
I hooked this into a Black yellow from the fuse box.A7- not used
A8- orn- ALDL Serial data. This is your ALDL pin E data for your lap top.
A9- wht/blk- ALDL pin B diag mode. When jumpered to ground will set the ECM to ALDL diagnostic mode.
A10- brn- VSS speed sensor signal to the ECM (optional)
A11- ppl or blk- MAP sensor ground. See ECM ground thread.
A12- blk/wht- System ground. Can be tied with D1. Goes to engine ground.
B1- orn- 12v fused from battery. I use an inline fuse on this. It also ties into C16.
I found a hot all the time for the heater and used a 20 amp inline fuse. This mostly runs the fuel pump. there is a few grays. One goes to the Prime relay and one that goes to a oil pressure switch. Oil pressure is what Switched the fuel pump on.B2- tan/wht- Fuel pump signal from the relay. This one ties into several places, the fuel pump, the relay, and the ecm. When the relay is on it sends 12v thru this wire to turn on the fuel pump, at the same time it tells the ECM the fuel pump is on.
I believe I tied this into the gray wire.B3- blk/red- EST reference.
B4- not used
B5- ppl/wht- EST high reference
B6- not used
B7- blk- ESC signal This is the knock sensor signal to the ECM. The knock sensor circuit is optional. If not used, tie this wire to C14 the 5v reference.
B8- dk grn- AC signal. This tells the ECM that the AC is turned on. This can be used to set the idle speed higher when you turn the AC on. I use it to increase the idle when using the compressor for on board air. Same thing!! Just tie it to the wire going to the AC clutch.
I think this is a hot in for high idle. COULD TOGGLE SW THISB9- not used
B10-orn/blk- Park/Neutral sw. This is optional but I have hooked it into the park sw on the tranny. It tells the ECM when you are in Pk or N. It can be used to give a slight adjustment to idle speed when switching from park to drive and back.
I have this toggled to ground.B11- not used
B12- not used
C1- not used
C2- not used
C3- IAC- Idle air control
C4- IAC
C5- IAC
C6- IAC -The ECM controls the IAC motor. It adjust the amount of air that is bypassed around the butterflies to adjust the idle speed.
C7- not used
C8- not used
C9- ppl/wht- Starter crank signal. Goes to the small terminal of the starter. The stock scout wire is white that goes there. Tells the ECM you are trying to start the engine.
In line 3 amp fuse then to the starter.C10- yel- Temp sender signal
C11- lt grn- Map sensor signal
C12- not used
C13- dk blu- TPS sensor signal
C14- gry- 5v reference signal to map and TPS.
C15- grn- inj B ground signal. Most systems do not use this. It was used on some of the bigger engines to share the load of the injector signal.
C16- orn- fused 12v tied to B1
D1- blk/wht- System ground, ties to A12 and engine. See ECM ground thread.
D2- blk- Sensor ground. To eng.
D3- not used
D4- wht- EST control
D5- tan/blk- EST bypass. This is the wire that has a plug near the distr that you disconnect to set your timing.
D6- Tan- O2 ground to engine.
D7- ppl- O2 sensor signal
D8- D13 not used
D14- lt grn- Injector B ground signal
D15- blu- optional injector A ground signal
D16- blu- Injector A ground signal
And that's it.
4 hours sitting in the living room cause its freezing out side.If you sit down on your garage floor and have each sensor plugged into the harness, then trace each wire back to the ECM connector, you will be able to separate a lot of unneeded wires.
Once you have each wire identified and laid out, then you can set it up on the engine and start tailoring it to fit your engine.
Placement of the sensors will determine wire length. Most stock harnesses are plenty long and only need to be shortened or wrapped and bundled.
When I'm all done and it's running then I go back and reinstall the plastic loom over all the harness.
