what is required for PCM pinouts

[Boeing]

Ok, so this is a tall order, so big thanks in advance. These are the correct connections for my PCM with my 1995 5.7 liter. I am trying to thin out the factory harness. My question is: what do i need to just make this engine run and go down the road? I get the easy stuff, power, ground, injectors etc.
but what about O2 sensors and egr connections, things like that?
I will not be running any kind of emissions stuff that I dont need, unless of course its required to keep the engine running.

Thanks guys




RED PCM 32 Pin Connector
Pin Wire Color Description
A-1 BLK/WHT PCM Ground
A-2 TAN/WHT PCM Ground
A-3 LT BLU/WHT Idle Air Control (IAC) Valve “A” High
A-4 PPL/WHT Ignition Control Module REF High
A-5 RED/BLK Ignition Control Module REF Low
A-6 LT BLU/BLK Idle Air Control (IAC) Valve “A” Low
A-7 LT GRN/BLK Idle Air Control (IAC) Valve “B” Low
A-8 LT GRN/WHT Idle Air Control (IAC) Valve “B” High
A-9 DK GRN Fuel Injector “B”
A-10 PPL Oxygen Sensor Signal
A-11 --- Empty
A-12 TAN Oxygen Sensor Ground
A-13 --- Empty
A-14 WHT/BLK DLC Diagnostic
A-15 DK BLU TP Signal
A-16 DK BLU Fuel Injector “A”
B-1 --- Empty
B-2 TAN/BLK Ignition Control Module Bypass
B-3 BLK Sensor Ground
B-4 BLK Sensor Ground
B-5 YEL/BLK Transmission Fluid Temp
B-6 --- Empty
B-7 --- Empty
B-8 YEL ECT Sensor Signal
B-9 --- Empty
B-10 LT BLU/BLK Cruise Control
B-11 --- Empty
B-12 GRY Fuel Pump Signal
B-13 LT GRN MAP Sensor Signal
B-14 --- Empty
B-15 DK BLU Knock Sensor
B-16 BRN EGR Pintle


-------BLUE CONNECTOR-----------------------------------------------------------

Pin Wire Color Description
E-1 GRY EGR Solenoid
E-2 WHT 3-2 Shift Control Solenoid
E-3 --- Empty
E-4 DK BLU Range Signal B
E-5 RED Range Signal C
E-6 BRN/WHT Check Engine Light (CEL)
E-7 --- Not Used
E-8 YEL/BLK 2-3 Shift Solenoid Enable
E-9 LT GRN 1-2 Shift Solenoid Enable
E-10 TAN/BLK TCC Solenoid (w/ 4L60-E Only)
E-11 BRN TCC Solenoid (w/ 4L60-E Only)
E-12 DK GRN A/C Request
E-13 PPL Brake Switch
E-14 GRY 5 Volt Ref (MAP, Linear EGR)
E-15 PNK IGN Fused
E-16 ORN Battery Feed
F-1 PNK Range Signal A
F-2 RED/BLK Trans Input Shaft Speed Sensor (+)
F-3 DK BLU/WHT Trans Input Shaft Speed Sensor (-)
F-4 --- Empty
F-5 --- Empty
F-6 DK GRN/WHT Fuel Pump Relay Control
F-7 LT BLU/WHT Pressure Control Solenoid “Low”
F-8 GRY/BLK 4WD Switch
F-9 TAN Serial Data
F-10 RED/BLK Pressure Control Solenoid “Hi”
F-11 WHT Ignition Control Module Signal
F-12 BRN Transmission Output Speed
F-13 DK BLU VSS Signal
F-14 GRY 5 Volt Sensor Reference Voltage (TPS, MAP)
F-15 PNK IGN Feed
F-16 DK GRN/WHT Canister Purge Solenoid

[ItsJustMoney]

You have to run O2 sensors. If not, the motor will not go into 'closed loop' fuel mode. All pink wires need switched power, orange wire (on my 2007 vortec truck motor) required constant hot power from battery. LT1swap.com is a great resource. Take a look around and search the links....He lays out how to build a fuse block and relay setup. I got mine going with a main power relay, a fuel relay, and the TCC relay, which is the torque converter lockup. Good luck.

[Boeing]

I have been on that site several times. It's a good site with lots of info, but from what i have seen its meant more for Vortec and LS engines.
I have searched but could not find anything dealing with a plain 1994 tbi v8.
Unless as i have mentioned before, they are similar enough to so be useful.

Thanks for the info though

[47 Fasttoys]

Hey Boeing, I am running a 5.7 TBI ('93 version) on my '46 Chevy . I used a Painless kit but the pin outs should be the same. I did not need to have my PCM changed in any way. I do in fact run O2 sensors. Anyway I am out of town on business but will be back Thursday and I can give the connections used at that time.
Rob

[1project2many]

Minimum to run with a stock engine is distributor connection, fuel pump, power, ground, fuel injectors, and TPS. It will run like poop but it will run. Add coolant temp and MAP and it will run much better. Add O2 sensor connections and the computer can adjust the fuel if it's slightly lean or rich in order to keep the catalytic converter happy. Add brake pedal switch and the transmission controls and the pcm will be able to shift an electronic transmission. Add the diagnostic connectors and the pcm will be able to talk with a scantool or laptop if there's a problem. EGR and Purge systems allow the engine to be fully emissions compliant.

So you can decide what you don't want. But if you remove the transmission controls, the EGR and purge, or almost anything else the stock chip will light the check engine light. If you want to remove those items I'd plan to have a custom chip burned.

gearhead-efi.com is a good resource for older trucks.

[Boeing]

Originally Posted by 47 Fasttoys

Anyway I am out of town on business but will be back Thursday and I can give the connections used at that time.
Rob

Thanks Rob, looking forward to it! Be interesting to see how a 3rd party vendor
Wires it up.

[Boeing]

Thanks "1project2many"

That's all great info. I will be running a 4l60e and probably keep the diagnostic port wired in to scan codes. Also O2 sensors sound like their mandatory.

Question about the O2 sensors....where do you install these with an aftermarket exhaust with let's say headers?

[1project2many]

Question about the O2 sensors....where do you install these with an aftermarket exhaust with let's say headers?

O2 sensors are not mandatory but a system without them is missing out on some ability to "self tune" as the engine conditions change. They don't adjust the fuel for best mileage, though. They are in place to makes sure the engine burns the right amount of fuel to keep the OEM catalytic converter happy.

The sensor should really get a good, mixed sample of exhaust gas. And it's best if the sample is as warm as possible. I often place the sensor about 6"-8" from the point where the individual header pipes merge. In some cases you'll need to use a heated sensor to ensure the signal is good. There are some who choose to use a heated sensor anyway just to prevent future troubles. This is acceptable.

[Rude Dude]

Don't know if you seen this video

https://www.youtube.com/watch?v=1lpuIiPB2sk

[HUSSEY]

I'm running a TBI unit too and bought an engine wiring harness from http://fuelinjectionconnection.com.

Mine is a 1991 ECM which is likely different from yours. You will find that a 1227747 is popular but is the older version compared to yours. The 85-92 ran a 700R4 and the later years ran a 4L60E. You also need to be concerned about the correct square wave 2000 pulse per mile speed signal to the computer, the separate spark knock module and the correct distributor with a spark control module (as applicable on my 91).

The only thing I removed was the carbon canister purger because I was too lazy to mount and set up a carbon canister. I did leave the EGR in place because it really adds no complexity plus is serves a purpose to reduce NOx emissions.

When I started on mine I too planned to use a stock harness. Every one I looked at the junk yards was old, dirty, with dried wire insulation ready to crack. The effort wasn't worth it to me which is why I went with a new harness. Plus the new harness was oh so easy. I plugged everything in, primed the oil and fuel pump, cranked it, no start, turned the distributor as little and it fired right up.

I think studying a wiring diagram is more explanatory than just the pin out. Also, I think you will find better sources that this forum for this kind of information, there are whole threads dedicated to this in detail on other forums. I've got mine up and running fine so if you have any specific questions shoot me a PM.

[1project2many]

The older 7747 really needs a speed signal in order to provide proper idle control. The later 7427 does a better job of working without the speed input, which is part of the electronic transmission harness in a stock vehicle, although including this signal has benefits.

Using the 7427 without an electronic transmission will require a "non-stock" configuration which either means using a program from a truck with a manual transmission and a similar computer, or making a number of changes to the stock chip.

My truck was first wired up as a 1983 Camaro with Crossfire using a wiring harness from an '80s S10. Then it was rewired to use a 7747 from a late '80s K truck. Now it's running a 7427 and is wired like a '95 K truck.

Plenty of folks choose to use a pre-made harness. It's easy to invest a fair amount of time in cleaning and modifying a 20-25 year wiring harness and still end up with wiring you're not happy with. After a number of conversion projects I can easily see the benefits of spending the money up front.

There are wiring diagrams and pinouts here:
http://www.gearhead-efi.com/Fuel-Inj...ull=1#post6774

[chev3600]

Dakota digital, jags that run and a few others make a cable driven speed impulse sender to give you the proper speed signal if needed for a non electronic trans.

[Boeing]

1project2many...thanks for the great thread...lots of good info on that efi site.
my PCM is indeed the 16197427. Its the PCM that came with the current engine and tranny (4L60E) that i now have, so hopefully it will work.

[47 Fasttoys]

Boeing, I took a look at mine this morning. Mine is a 7747 PCM even though it's a '93 model it has a 700R4. Mine came out of a G2500 van so maybe it used the 700R4 later then '92. Anyway the pin out is not going to be the same as the later unit.
Rob

[skymangs]

Check out Binderplant.com. Look under fuel injection tech to find all of what their is to know about TBI conversions. I did that on my 71 Scout.

[b-mac]

I'm about half way through my harness deconstruction.

Best site I've found:

http://lt1swap.com/


...and I see now other above me mentioned it.

[skymangs]

Originally Posted by b-mac

I'm about half way through my harness deconstruction.

Best site I've found:

http://lt1swap.com/


...and I see now other above me mentioned it.

I know Brennan(the creator of lt1swap.com) personally. He is the best you'll ever find. Called him with your questions, his number is on the site. Also like I said, check out Binderplanet.com. It is the best I have found to kiss. Good luck