1227747 to 16197427 Conversion PCM Swap with Wiring Pinout Directions!

[gregs78cam]

I have been looking for it for about a half hour now, I can tell you the PCM sees the input at IAC Mode Word #2, L4E86 bit 1.

From thirdgen from MarcusMandarino

"Fast355

I found the info about PSPS on Chilton's, page 6-60, 2.2L > F8

Marcus"

EagleMark EDIT: none ---- F8 -------unknown---------For Power steering switch input. (greags78cam post 10)
added to chart.

[93V8S10]

I have been looking for it for about a half hour now, I can tell you the PCM sees the input at IAC Mode Word #2, L4E86 bit 1.

From thirdgen from MarcusMandarino

"Fast355

I found the info about PSPS on Chilton's, page 6-60, 2.2L > F8

Marcus"

I've always been skeptical of that answer, since that pin is used with 4wd, so I just order a 1994 GM service manual. Should have a answer in a couple weeks.

[gregs78cam]

AAHHHH. I would test it if I had a way. What does the switch put through on this wire?

[EagleMark]

AAHHHH. I would test it if I had a way. What does the switch put through on this wire?

I don't know but I have one that works and shows when in use in adx on my LT1.

[93V8S10]

Got the new book in today, and F8 is the correct pin for the power steering switch. Also, fount out that B1 is for the DIS system used with the 2.2L. It is called the 1X Signal, and is used for ASDF (Alternate Synchronous Double Fire).

Anyone ever find the VATS pin? I'll trade you the AC High Pressure Switch pin. This was used to raise the idle if the A/C pressure got too high (no bins that I know of with this active).

[gregs78cam]

Sounds like that book has some good info in it. It there anything in there that could make sense of this trans datastream portion of the hac?

L53F3    FDB $0010      ; 11,  MALFFLG6, ERROR WD 6
                    ;
                    ; b7 1 = ERR 57. (not used)
                    ; b6 1 = ERR 58, XMISH TEMP HI
                    ; b5 1 = ERR 59, XMISH TEMP LOW
                    ; b4 1 = ERR 61, TURBO BOOST SENSOR HI
                    ;
                    ; b3 1 = ERR 62, TURBO BOOST SENSOR LOW
                    ; b2 1 = ERR 63, BARO SENSOR HI
                    ; b1 1 = ERR 64, BARO SENSOR LOW
                    ; b0 1 = ERR 65. (not used)
                    ;-----------------------------
L53F5    FDB $001B      ; 12, CURMALF5, CURRENT ERROR WD 6
                    ;
                    ; b7 1 = ERR 57. (not used)
                    ; b6 1 = ERR 58, XMISH TEMP HI
                    ; b5 1 = ERR 59, XMISH TEMP LOW
                    ; b4 1 = ERR 61, TURBO BOOST SENSOR HI
                    ;
                    ; b3 1 = ERR 62, TURBO BOOST SENSOR LOW
                    ; b2 1 = ERR 63, BARO SENSOR HI
                    ; b1 1 = ERR 64, BARO SENSOR LOW
                    ; b0 1 = ERR 65. (not used)
                    ;-----------------------------

I was thinking it might be something used in the diesel engine TCM.

Can you shed any more info on any unlisted I/O pins?

[93V8S10]

Nothing about diesel engines, the new book is the S/T Driveability & Emissions Manual. I've woundered about those too.

Here's what I've got so far:

[EagleMark]

Also, found out that B1 is for the DIS system used with the 2.2L. It is called the 1X Signal, and is used for ASDF (Alternate Synchronous Double Fire).

So when is the DIS hac coming out for V8?

[JeepsAndGuns]

So when is the DIS hac coming out for V8?

I havent forgotten or abandoned the northstar DIS we talked about a couple months ago. Once I get my MPFI installed and tuned, DIS comes next.
So I'm intrested in DIS info too.

[93V8S10]

So when is the DIS hac coming out for V8?

LOL, way over my head.


A13 is the A/C high Pressure Switch
E7 is AIR Bypass Control
I'm still uncertain about whether B7 can be used for the underhood ESC.

I'd bet on B11 or B14 being VATS.

[1project2many]

Very interesting that GM found ASDF to produce cleaner emissions in the S10. In some masks ASDF is a function of IPW to prevent commanded on times less than injector is capable of and is implemented without 1X signal. In these cases ASDF is not implemented during most operating conditions. It's noteworthy that GM resorted to hardware solution in 7427. I'd love to have more time to investigate the hardware relationship between the 1X input pin, memcal configuration, and limp mode fueling.

The list of unused pins has been pretty consistent in all of the models I've looked at. A11,A13, B6,B7, B11, B14, E7, F4,F5. Checking multpile vehicles to see if this list can be shortened might be a worthwhile approach.

[TheApocalyptican]

I am planning on switching from the 7747 to the 7427. Need to the get the PCM itself tho, and since I have a V8, do I need a 7427 from a V8, or will the V6 version work too?

[dave w]

I am planning on switching from the 7747 to the 7427. Need to the get the PCM itself tho, and since I have a V8, do I need a 7427 from a V8, or will the V6 version work too?

I've never tried using a V6 Memcal for a V8 engine. I've done several '7427 conversions, all V8 engines and all had V8 Memcals.

dave w