I want to end up using the 749 Sy/Ty ECM, but my car is a 165 MAF car. I'm going to be running boost so I will need a 2 bar system.

My newbie question is, will it be easier to repin for a 730 and then repin to a 749 or just start from scratch and match to the 749...

 

Is there a post with a definitive 165 -> 749 swap? Ive seen a bunch of conflicting pieces but not a solid "this is how its done" post with pin rewiring, new 2 bar map and new knock sensor requirements.


Most of the links Im finding point to speedtoys.com and they are now dead .

ie:
http://www.speedtoys.com/~bort62/7749/86to92.txt

Thanks

 

Not specifically from a 165 to 749, but draw it out on a peice of paper and wire it up.

http://www.eecis.udel.edu/~davis/z28/ecm_swap_730/
https://www.thirdgen.org/1990conversion

 

Teach a man to fish...

Dug thru gobs of stuff and came up with this. Few conflicts on the iac and injectors discussed but that seems easy to figure out once your at that point. Here is a link to a spreadsheet I made from everyons parts.

http://www.iroc-ss.com/165to730-749.htm

 

I was looking at what you had written out, what do the question marks symbolize? I don't understand what you are having a problem with.

daniel

 

Been there done that. DO NOT rewire your 730 ECM IAC pins. They are wired properly for the 749 ECM AS IS.

If using stock TPI injectors, DO NOT rewire the injector wires.

Overall, there is only like 3 or 4 wires to move for the 730 ECM to 749 ECM conversion.

EDIT: from memory the 749 has an output driver missing so the TCC is lost. You need to verify that. For what it is worth, I ran both $58 (Sy/Ty) and the $8D (Camaro SD) code in the 730 ECM wired as a stock 730 ECM for a while switching between the two WITHOUT re-wiring. The IAC re-wire thing is a myth and the injector wiring change is ONLY for Peak&Hold (non-TPI) injectors. Good luck.

 

The question marks are where I found conflicting information on how to rewire. Ill start as junkcltr vbmenu_register("postmenu_3140946", true); suggested and swap to the other wires if all hell breaks loose.

 

Sorry for the hijack, but junkcltr, what set up are you using as far as data logging, PROM burning and editor. I am leaning towards Moates APU1 Autoprom and use 59$ in a 7730.

Since my old laptop died with serial and parallel ports, I bought a new Dell which has USB ports and effectively rendered my EASE Scan tool and Xtronics Power Programer useless.

 

I beeen realy wanting this topic addressed too. I am haveing issues dicifering the stuff too. I want to go froma 165 right to a 749 . I will be watching this thread closely . I NEEEEEEED it done bad . Car gets done in March ( turbo ) . Also will my 165 verison Porminator PRO just plop into the 749 ECM >?

 

What's the change for the IAC and injectors between the 165 and 730? If there is a change and you are saying that they are the same for the 730 & 749, then the wiring would need to be switched to the 730 except three wires?

 

91 Formula,

I have a USB ALDL cable from EASE. Actually works with some other Serial to USB conversions.

 

Repin so you can use the $58, $59 or $60. The 7730 and the 7749 work equally well as long as you don't use low z injectors. I have run the various codes.

Below are my notes I used when I originally wired it for the $58code I used mikes website for the maf and knock sensor.

vet 165 165 7749
Fuel Pump Relay Control A1 A11
Air Select Valve A2 NOT USED
Canister purge Sol A3 NOT USED
EGR solinoid A4 E9 DOES NOT OPERATE IN V8 MODE DELETE
Service Engine Soon A5 E7
ignition A6 A6
TCC(at)-Shift(MT) A7 F4
Serial Data A8 A9
DIAGNOSTIC Test A9 E12
Speed Input/speed sensor singnal TO IP CLUSTER A10 C6 may requires PROM Change:
MAF sensor Ground A11 NOT USED
ECM Ground A12 A12

countinuous Battery B1 B1
Fuel pump control signal B2 E13
Dist ref LO /ignition ground B3 D9
not used B4 not used
Dist ref HI B5 D8
Theft Deturant(vats) B6 not used
EST Retard/esc signal B7 F9 MODIFY CIRCUIT 165 FOR NEWER KNOCK SENSOR
AC on Input/off on c60 B8 F1 DOUBLE CHK VET CLUTCH SIGNAL COMP TO 2.0
Not used B9 not used
Park/Neutral Input B10 D16
not used B11 not used
MAF Sensor signal B12 not used

Fan control output /relay C1 E8
Air diverter valve solenoid C2 not used
Idle air control valve B lo C3 E6
Idle air control valve B hi C4 E5
Idle air control valve A hi C5 E3
Idle air control valve A lo C6 E4
vet od switch 4th C7 ??
Top gear input 4th C8 D14 not on 7749 diag see a65-730 doc
not used C9 not used
coolant temp input C10 E16
not used C11 not used
MAT sensor C12 F16
Throttle position sensor C13 F13
TPS volt reference C14 A5 ALSO USED FOR MAP SIGNAL
EGR TEMP Sensor C15 D14 DOES NOT OPERATE IN V8 MODE DELETE
Battery C16 C16

ecm Ground D1 D1
Ground for tps cts mat D2 B5 B5/ = CHASE GROUND FOR SENSORS
Ground D3 B6 OPEN FOR MAP GROUND DIRECT
Spark Timing Input/est D4 C8
IGN mod bypass output D5 C7
oxygen sensor ground D6 E15
oxygen sensor SIGNAL D7 E14
not used D8 not used
not used D9 not used
ECM ground D10 D7 not on 7749 diag see a65-730 doc
A/C fan Presure Switch D11 C9
Burn-off control Relay D12 not used
not used D13 not used
not used D14 not used
Fuel Injector Ctrl1357 D15 C11 PER 7730 DIAGRAM COMPARE TO 7749 TYSY???
Fuel Injector Ctrl 2468 D16 C12 PER 7730 DIAGRAM COMPARE TO 7749 TYSY???

Wate gate solenoid F1






The '730 ECM ESC circuit is looking for a 3.9K ohm resistance in the
knock sensor and the '165 KS is 100.0K ohm. You can put a resistor
(From Radio Shack, et al.) to bias the 100.0K ohm KS so that it appears
to the ECM as 3.9K ohm. The resistor should be between 3.8K and 4.2K
ohms, and connect between the Knock Sensor wire of the ECM (GF9) and
Ground.

If you are building an adaptor harness like me, you can
solder this between B7 and A12 of the adaptor plug that your
harness plugs into. (assuming you are using the jumpered ESC
connector on the firewall. If you are bringing a new wire
thru the firewall, you will have to connect it and A12 with
the resistor)


If you are using the ESC connector on the firewall to bring
the KS signal in, you will have to jumper pins "C" and "E"
on the ESC harness plug. While you are building the jumper,
you can add the resistor between the jumper and pin "D"
(making it a 3-prong jumper) and your '165 KS will be properly
biased for use in the '730 ECM


New sensor/wires needed to be added:

BA4 (MAP +5v ref.)
BB6 (MAP GND)
GF15 (MAP Signal)

These signals can be brought in thru the harness on the MAF
wiring if you build an adaptor cable or splice into your MAF harness
plug. You MUST wire the adaptor or splice this way or risk an electrical
short:
BA4 (MAP +5v ref.) MAF pin B (165 ecm pin A11)
BB6 (MAP GND) MAF pin A (165 ecm pin D1)
GF15 (MAP Signal) MAF pin C (165 ecm pin B12)

I was able to build a MAF-MAP adaptor plug by cutting the "female"
connector from a broken MAF, and soldering the connectors to a
"wire harness" that terminates on a MAP plug. (available at most
any Auto Store)