Im using an 85 xr4ti harness, wired for an LB3 computer. I think i have most of the wiring figured out. Here it is, someone please correct me if i am wrong so i dont fry the computer or wiring.
Pin #1: Keep Alive power - Wired to the battery for power ALL the time, key on or not.
Pin #4: Ignition Diagnostic Monitor - No clue what to do with this.
Pin #16 Ignition ground - To body ground?
Pin #17 Self Test Output - Wired to the check engine light? I'm not sure on this one, so i'm just guessing.
Pin #20: Case Ground - To body ground.
Pin #22: Fuel Pump Control - Goes to the fuel pump?
Pin #30: Neutral Drive Switch - I don't think i'm going to use it. My car is a manual trans and has no clutch safety switch. Does this pin get grounded or does it need 12v?
Pin #31: Boost Control - I have no idea what to do with this wire.
Pin #34 Data Output Link - Not clue about this one either.
Pin #36: Spark Output - Not sure on this one either.
Pin #37: Vehicle Power - Power only when the key is on?
Pin #40: Battery Ground - Self Explanatory. Ground directly to the battery.
Pin #48: Self Test Input - Short STI(48) and STO(17) together to get the computer to flash the check engine light to check for codes? Is this correct?
Pin #49: EFO Ground - Body Ground?
Pin #60: Another battery ground - Ground directly to the battery.
Pin #24: Octane Switch - Tap into pin #46 (signal return wire)
To recap:
I've counted 5 grounds. Number 16, 20, and 49 to body grounds, or wherever. And numbers 40 and 60 directly the battery.
12v with key on to pin 37.
12v directly from the battery to pin #1.
Things i'm not sure what to do with:
#4 Ignition Diagnostic Monitor
#17 Self Test Output
#30 Neutral Drive Switch
#31 Boost Control
#34 Data Output Link
#36 Spark Output
#48 Self Test Input
Can anyone think of anything i've missed?
pin 1: keep alive power. constant 12 v. need it.
pin 4: same location (pin) on both cars. goes to tfi and coil. need it.
pin 16: same location on both cars. also goes to tfi. need it.
pin 17: same location on both cars. goes to the self-test diag. plug and check engine light. need it
pin 20: lb3, case ground. good body ground should do fine. need it
pin 22: same location on both cars. to the self diag plug, then down to the fuel pump. need it
pin 30: for lb3 with m/t, loop pin 30 and 24 (for all the time premium fuel timing curve) to pin 46 (sig return)
pin 31: if your using a manual boost controler, you dont need it. if your running your factory boost controller, move pin 32 from the merkur harness to pin 31.
pin 34: lb3, no conn. not needed
pin 36: same on both cars. goes to the "spout", small pill you remove to set the base timing. the other side of the spout goes to the tfi. you need it
pin 37: same on both cars. key on power. needed
pin 40: like you said, self explanatory
pin 48: same on both cars. goes to the single wire plug for self diag. i dont remember how to test the codes on these with out a scanner. i know its more than just jumping 2 wires. you need it.
pin 49: eGo ground. same on both cars. you need it. keep in mind the 87/88 turbo coupes use a 3 wire heated ego. this uses pins 60 (blk/lt grn), 29 (dk grn/ppl) and then a gry/yel wire to key on power.
pin 60: batt ground, needed
pin 24: see pin 30.
on the merkur harness:
pin 43 (vaf) needs to be moved to pin 27
pin 25 (vat) needs to be moved to pin 43
pin 25, now empty, will go to an act sensor in the lower intake which has a 2 wire connector. the other wire would go to pin 46 (signal return)
as stated above, if your keeping your stock boost controller, move pin 32 to pin 31.
pin 35 needs to be moved to pin 33 IF your running the egr sol. if not you can just remove it. on the 87-8 turbo coupes, pin 35 is ride control.
i may have some connectors if you dont have them. i can also give you print outs of both eec wiring diagrams if youd like. i can also give you wire colors if youd like.
bob
I think this is the best info i've seen yet. Thanks!
Some of this stuff is in the harness and all I have to do is plug it in to the device it belongs to. I just wasn't sure what some of them were and if i would have to connect them to the pinto harness or to a ground or if all i had to do was plug it in and so thats why I asked.
From what I gather the only wires i should have to splice into and hook up should be:
1 Keep Alive Power
17 Self Test Output
20 Case Ground
22 Fuel Pump
24 Octane Switch
25 ACT sensor - This one i have to add the wire and the connector.
30 Clutch switch/Neutral Safety switch
37 Vehicle Power
40 Battery Ground
49 EGO Ground
60 Battery Ground
Is there anything I've missed?
Also, I do need the ACT connector if you have it. Let me know what you want for it and if you have it please!
for the ego ground, it should be an orange wire with an eyelet end. so all you have to do is put it to a good body ground, no splicing needed. for your batt grounds i would run both wires individual to the negative post.
you will need to wire your merkur harness for the 3 wire hego sensor. actually, i dont know this for a fact. but, thats what the turbo coupes used. if i remember correct the merkur uses a one wire.
ill check my extra harnesses today for the act pigtail. i may even have an extra act sensor. i know i dont have the hego pigtail. if i have everything, you can have it for the price of shipping.
bob