88ls1blazer

iTrader: (1)

i am just wondering if anyone has a list of the necessary wires to retain on the factory wiring harness on a 2000 pcm, i am trying to consolidate and use the factory harness, now i know things like fuel tank pressure are not going to be used, and a few others such as egr, rear o2, and some other wires, but things like water temp, just one for example. any input is appreciated, Thanks, Andy

Magnus

iTrader: (4)

Are you just looking for harness pinouts? I have those.

88ls1blazer

iTrader: (1)

nope, i also have those, i need to know what needs to stay and what can be cutout

Magnus

iTrader: (4)

Hmm.. ok Lets go over the list..

Oil Pressure: Optional but recomended
Clutch Anticipate Switch Signal: uncertain
IGN Power for TCC Stop Lamp Switch: Optional but recomended
TCC/Cruse Brake Switch: Optional but recomended (Paired with above)
Ground
PNP Switch Signal: Optional
Low Coolant Indicator: Optional
VSS Output: Optional but recomended


5V Feed (Fuel tank pressure): Optional
MIL Control: Optional but recomended
EVAP Canister Vent Valve Control: Optional
Theft Detterent Fuel Enable: Required
A/C Request: Optional
Fuel Ground: Optional depending on how your fueling is setup
Fuel Tank Pressure: Optional
Fuel Level Input: Optional
Serial Data (Class 2): Optional but recomended

Hot in Run and Start (IGN/INJ Bank 1 15A): Required
A/C Clutch Relay Control: Optional
A/C Clutch Status: Optional
TPS +5v to TCS: Optional
TPS signal to TCS: Optional
with IGN 1 Relay Engaged (Tranny/EGR 15A): Required
Cooling Fan 2 and 3 Relay Control: Optional but HIGHLY recomended
Cooling Fan 1 Relay Control: Optional but HIGHLY recomended
TPS sensor low to TCS: Optional


Low Coolant Sensor: Optional
Hot in Run and Start (IGN/INJ Bank 2 15A): Required
Air Pump Relay Control: Optional
Fuel Pump Relay Control: Required most likely
Ignition Positive Voltage for PCM: Required
Battery Positive Voltage for PCM: Required
Ground:
TCS Spark Retard Signal to Brake Control Module: Optional


Hot with IGN 1 Relay Engaged (TCC Stop Lamp Switch/MAF/O2 20A): Required
Cruise Control Inhibit: Optional
Cruise Engaged Signal: Optional
Tach out to Brake Control Module: Optional (Re-use for dash tach)
AIR Solenoid Relay Control: Optional

That's my oppinion on things.. Does it help?

88ls1blazer

iTrader: (1)

very much so indeed, i am not running a computer controlled fan setup though, it is a stand alone unit, do i still need the cooling fan relay control? i know what tps is but tcs? throttle control solenoid? or what, its been a long damn day, so iprobably will smack myself when you tell me what it stands for, also, the fuel enable circuit from the vats system, my vats has been edited out, still necessary? all gauges auto meter, using their senders, i have a walbro 340 in a stock 88 blazer tank, no splicing. i need this info, its driving me crazy the truck has had a motor and trans in it for 2 1/2 months, all i need to do is radiator hoses, exhaust, wiring, new u-joints, and get a new bypass and pickup for the oil pan, getting very anxious as i could probably get this thing done in less than a month if i had the info, I am very appreciative on the info, especially how fast i received it, thanks, Andy

88ls1blazer

iTrader: (1)

also, i am running an old school 1-wire gm alternator with the march bracket, no ac, no power steering, and probs with the alternator not being computer controlled?

Magnus

iTrader: (4)

You don't need the fan relay controls, it's just nice to have the PCM turn the fans on when it wants to. The PCM knows the coolant temps at all times.

TCS is traction control system.

You do need the fuel enable circuit from the VATS system. You can pick up a bypass unit I believe that will trick the PCM into thinking everythign is ok. Without this hooked up though, you'll never get injector pulses.

I run the stock LS1 alternator which is 1 wire as well I believe.. a brown one which is used for voltage regulation. I'm not sure if you will have problems or not.

No problems at all with !AC, !PS. In my conversion, I run no PS, AC, EVAP, EGR, AIR, ABS, TCS, Traction Control,... I only run the necessities. It's weight reduction to me.

88ls1blazer

iTrader: (1)

same here, any wat to hot wire the fuel enable? that is going to be a bitch if i cant, i dont have the vats module, at least not to my knowledge, and if there is a bypass, where can i get it?

Magnus

iTrader: (4)

can't just hotwire it... I do know there is a VATS delete kit.. I don't know where you can get it but I'm sure someone will chime in here.. or perahps do a search.

gMAG

iTrader: (1)

Guys, Do a search in PCM Diagnostics for "VATS" (gMAG-"ECM/BCM help needed", 3-20-03). Speartech answers, "VATS bypass module can be used, or PCM can be reprogrammed to delete VATS function" (and fuel pulses will be enabled). EDITED 07-06-03 by gMAG to include the following...VATS reprogramming can be accomplished with LS1EDIT.
Please read entire thread! Thanks, Glenn

88ls1blazer

iTrader: (1)

ok, well, hopefully i will have enough info, i want wiring done in about a week and a half, thanks, Andy

ls1blazer

iTrader: (6)

you can use a bcm and a resistor to bypass the vats. thats what I did 2 years ago on my 99

SSh

Magnus,

I could use the pinouts for a 2001 harness if you have them. I sent you an email as well.

Thanks,
-ssh

Magnus

iTrader: (4)

SSH, I got the e-mail just been very busy.

in my sig is a link to my web page, then in the left click the V8 swap link.. and there is a link to the pinouts on that page.

SSh

I understand busy. Thanks for the pointer, I got them from your web site.

Scott

Magnus

iTrader: (4)

they are mapped from my 99... if you have any more questions e-mail me or post and i'll try to help you out.

downtime really sucks.

jbrodder

i got my vats module on e-bay from baker electronics in prinston w.va. they're cheap.

Red Heartbeat

iTrader: (9)

Okay, checked out my wiring harness conversion and found quite a few wires removed.

2001 LS1 5.7L with 4L60E A4 Transmission

Blue connector....

23 - Low Reference
25 - HO2S Low Signal Bank 2 Sensor 2
28 - HO2S Low Signal Bank 1 Sensor 2
32 - CPP Switch Signal ? what is CPP?
65 - HO2S High Signal Bank 2 Sensor 2
68 - HO2S High Signal Bank 1 Sensor 2
70 - Oil Level Switch Signal

Red Connector....

4 - Air Injection Reaction Solenoid Relay - Coil - Control
13 - Cruise Control Engage Signal
34 - Evaporative Canister Purge Solenoid Control
36 - AIR Pump Relay Control
37 - Cruise Control Inhibit Signal
45 - Evaporative Canister Vent Solenoid Control
46 - MIL Control ? what does MIL stand for?
53 - Ignition Retard Signal
54 - Fuel Level Sensor Signal
64- Fuel Tank Pressure Sensor Signal

I paid good money for this conversion. Everyone else gets this data for free.

Scooter70

iTrader: (1)

You da man Red Heartbeat!! Are these the wires that were removed or the ones that are left?

MIL is the check engine light. (Malfunction Indication Lamp or somthing to that effect)
CCP: Clutch Position (maybe, just guessing)

I have an M6, so there's a few that are going to be different. Do you have EGR, AIR, or TCS hooked up?

Thanks alot,
Matt

Red Heartbeat

iTrader: (9)

Those are the wires removed from the PCM connectors. I would leave in the MIL wire. It is nuts to remove the MIL since that is your early warning point for something, possibly the engine, going south.

I will be posting further details later.