Silly Questions

[lakedrifter]

So, still new to all this, but I had some question for the beginner.

I have noticed that GM used 2 different ecm designs between 1987 and 1992

1987/90 - 24 and 32 pin connector
1991/92 - 32 and 32 pin connector

I think that's right:)
What were the differences between the 2? Are both OBD1?

Are the ALDL ports for them different?


lakedrifter

[Randy 79]

It may depend on the computer more than years. For example, my 92 7060 ecu has a 32 and 24 pin connector. OBD1 would be 95 and earlier.

[fastacton]

If you're talking truck ECMs like the '7747 (black connectors), it was the 24/32 pin style from '87 through '92. In '91 the '7060 (brown connectors) came on the scene through '93 and was still a 24/32 pin setup. In '93, the '7427 style ECM (red/blue connectors) came along and was the 32/32 pin setup through '95. They are all OBD1 and the ALDL uses the same connector, but different pins depending on the ECM.

[lakedrifter]

Thanks for the info guys. Yes it was a truck that I removed the ECM from.

I have the red/blue connectors, I guess I should go back and grab the ALDL from the vehicle I took the ECM from. That way the ALDL pin-out will be correct.

A couple more questions, but It’s more of a process out-line.

EFI install

1. Go through my wiring harness and label everything.
2. Install my TBI (after I rebuild it of course) w/IAC and TPS
3. Install my O2 sensor (I’m using a single wire for now)
4. Install my Fuel Pump (My original tank is bad so I will get a new one that is made for the in-tank fuel pump)
5. Remove manual fuel pump and install block off plate.
6. My Knock Sensor (83’) appears to be the same as from the EFI years.
7. Install my HEI Distributor w/EST and Coil
8. Install the ESC
9. Install my Relays
10. My air cleaner has the MAP sensor attached.
11. Install New water temp sensor at the water neck location
12. My van already has a VSS because of the cruise control (It’s the Yellow box behind the Dash). I’m not sure if it will work.
13. Install EGR solenoid. I have this already. My 700r4 used a Bleed solenoid to help with Lockup. GMs recommended replacement was the EGR solenoid.
14. Install my wiring harness

ECM

1. Load Tuner Pro on my Laptop
2. Download the correct BIN for the vehicle I working on.
3. Use the USB to ALDL interface to flash the EPROM with appropriate BIN (tune)
4. If I want to fine tune or make changes, Make them in tuner pro and re flash the EPROM

• Did I leave anything out of the process?
• What do I do with the wires for the transmission? will any of them be used for the TC lockup?
• Is my original Knock sensor usable?

lakedrifter

[lionelhutz]

MAP - should go to manifold vacuum, not the air cleaner
EGR - has nothing to do with the TCC lockup.
Tunerpro - can't flash the EPROM. You need a programmer.
The new ECM should be able to control the TCC better than a vacuum switch or whatever else you're using.
No idea on the knock sensor. There are generally 2 types, the 4k ohms and 100k ohms, and which one is used depends on the ECM.

[lakedrifter]

MAP - should go to manifold vacuum, not the air cleaner.

Its just attached to it (as in mounting location) and not connected to it.

EGR - has nothing to do with the TCC lockup.

You are correct, I had it confused with a delay valve.

The 700r4 lockup is controled by a vacuum switch (Single wire to the transmission) and a delay valve. So I will have to figure that part and how it works with the ECM.

You need a programmer.

Ok I fugured out what that is now:)

[JP86SS]

ECM:
For TunerPro you need 3 things

1.) Editor Definition "XDF" FILE for your "Mask ID" ($0D or $E6 whatever yours is running)
2.) Datastream (Logging) Definition "ADX" file (also for the Mask ID you have)
3.) Bin file (your running program if you want to make changes and reprogram. Otherwise not needed.
Then a logging cable and a chip programmer or emulator.

[lakedrifter]

ECM:
For TunerPro you need 3 things

1.) Editor Definition "XDF" FILE for your "Mask ID" ($0D or $E6 whatever yours is running)
2.) Datastream (Logging) Definition "ADX" file (also for the Mask ID you have)
3.) Bin file (your running program if you want to make changes and reprogram. Otherwise not needed.
Then a logging cable and a chip programmer or emulator.

With that being said, tuner pro with the bin, mask and data logging file utilizes the programmer if you want to change the eprrom?

The programmer is just the hard interface to the eprom from your pc/laptop?

[lakedrifter]

ECM:
For TunerPro you need 3 things

1.) Editor Definition "XDF" FILE for your "Mask ID" ($0D or $E6 whatever yours is running)
2.) Datastream (Logging) Definition "ADX" file (also for the Mask ID you have)
3.) Bin file (your running program if you want to make changes and reprogram. Otherwise not needed.
Then a logging cable and a chip programmer or emulator.

With that being said, tuner pro with the bin, mask and data logging file utilizes the programmer if you want to change the eprrom?

The programmer is just the hard interface to the eprom from your pc/laptop?

[lionelhutz]

Tunerpro would interface to a emulator which replaces the EPROM to emulate it. The advantage is that real time changes are possible with an emulator.

You'd use the programming software that came with the EPROM burner if you went that way.

[lakedrifter]

Tunerpro would interface to a emulator which replaces the EPROM to emulate it. The advantage is that real time changes are possible with an emulator.

You'd use the programming software that came with the EPROM burner if you went that way.

That makes more sense.

So if I want to just leave my ECM alone. knowing that I came out of a similar vehicle. Whats the chances of it working correctly?

[lakedrifter]

ok, last silly question.

When I was at the junkyard, I pulled a wiring harness and equipment from a 92 GM. Some one had already grabbed the ECM:) It dawned on me when the drivers seat kept wobbling around.

I ended up pulling a 5.0 ECM (16197427) from a 95 GM.

I could deffinatley tell the difference between the Wiring harness and the ECM harness, because the wire count is off by atleast 10.

My question is, can I still use this ECM with this wiring harness, just by mapping the wiring harness to the correct ECM pin? Will the ECM allow me to do that? Would this be considered a conversion from 1227747 to 16197427?

lakedrifter

[fastacton]

Yes, it would be considered a conversion and would be a good way to go. Just grab some red/blue connectors and swap the wires over, there are a couple of threads about how to do it here.

[lakedrifter]

Thanks alot for all the help. I grabbed the red and blue when I took the ECM, so I will get to sorting:)

Thanks again everyone..

[Fast355]

Its just attached to it (as in mounting location) and not connected to it.

You are correct, I had it confused with a delay valve.

The 700r4 lockup is controled by a vacuum switch (Single wire to the transmission) and a delay valve. So I will have to figure that part and how it works with the ECM.

Ok I fugured out what that is now:)

Your OEM setup sounds exactly like my 1983 G20 Van LE9 305 with the 700r4. Converted it to TBI from a 92 G20 and replaced the stock transmission with the 92 G20 trans after building it.

EGR Bleed Solenoid DOES have a part in the TCC circuit of an 83 G20.

You will have to completely rewire and reconfigure the pressure switches to have the ECM control the lockup of your early 700r4.