'94 Magnum EFI conversion info.

[TT'74]

I came across some of my old pinouts and wiring diagrams I used to hook up a '94 5.2l magnum into my '74 duster. I'll work on getting the schematics scanned onto her later this week. This isn't a how to and any information provided within is to be used at you own risk.

However, I'm happy to provide as much information as I can to help anyone with their own projects. For now this is just the main ECU pinout for a 1994 v8 magnum engine.

The following should be read as (pin #, wire gauge, color/tracer, detail).

1 20dg/rd Map sensor
2 20tn/bk Engine coolant temp sensor
3 16rd direct battery
4 18bk/lb sensor return
5 16bk/wt signal ground
6 20vt/wt 5 volt supply
7 18or 8 volt input
8 ---------------------
9 14db ignition feed
10 20or/wt trans OD control
11 18bk/tn power ground
12 18bk/tn power ground
13 18lb/br injector driver 4
14 18yl/wt injector driver 3
15 18tn injector driver 2
16 18wt/db injector driver 1
17 18db/tn injector driver 7
18 18db/tn injector driver 8
19 18gy ignition coil driver
20 18db generator field driver
21 18bk/rd tb surface temp sensor
22 18or/db throttle position sensor
23 18tn/wt heated O2 sensor (5.9l hd)
24 18gy/bk reference pickup
25 20pk data link transmit
26 ----------------------
27 18br a/c cycling switch input
28 ----------------------
29 18wt/pk brake sense
30 20br/yl park/neutral position sensor
31 ---------------------
32 20bk/pk malfuntion indicator lamp
33 20tn/rd vehicle seed control - vacuum
34 20db/or W.O.T. cutout relay
35 20gy/yl EGR solenoid
36 ---------------------
37 20bk/or transmission OD lamp signal
38 18pk/bk injector driver 5
39 18gy/rd idle air control motor
40 18br/wt idle air control motor
41 18bk/dg heated O2 sensor
42 ---------------------
43 ---------------------
44 18gy camshaft position sense
45 20lg data link receive
46 ---------------------
47 20wt/or wehicle speed sensor pickup
48 20br/rd vehicle speed control - set
49 20yl/rd vehicle speed control - on/off
50 20wt/lg vehicle speed control - resume
51 20db/yl automatic shut-down relay
52 20pk/bk evap/purge solenoid
53 20lg/rd vehicle speed control - vent
54 20or/bk EMCC solenoid
55 20or/lg transmission OD solenoid
56 20gy/pk service reminder indicator lamp
57 16dg/or A.S.D. - battery sense
58 18lg/bk injector driver 6
59 18vt/bk idle air control motor
60 18yl/bk idle air control motor

 

[abodyjoe]

i'd be interested in seeing all this. have a 94 van with a 5.2 and was thinking of using that in the dart..

 

[BillGrissom]

Thanks. I don't have a Magnum engine, but do have a Magnum intake, ECU, and wire harness I am considering installing on my 273 to get cheap EFI. Even if I use another ECU, I can use the wiring harness, so the pinout you gave is priceless for that.

 

[TT'74]

Thanks. I don't have a Magnum engine, but do have a Magnum intake, ECU, and wire harness I am considering installing on my 273 to get cheap EFI. Even if I use another ECU, I can use the wiring harness, so the pinout you gave is priceless for that.

I shouldn't be too bad on your 273, but the intake won't work. You'll need to get an EFI intake that will bolt to LA heads, which isn't too hard or costly. You also need a magnum dizzy, a magnum flywheel, and to notch your bell housing for the crank position sensor. All in all though it won't be too much.

 

[BillGrissom]

I shouldn't be too bad on your 273, but the intake won't work. You'll need to get an EFI intake that will bolt to LA heads, which isn't too hard or costly. You also need a magnum dizzy, a magnum flywheel, and to notch your bell housing for the crank position sensor. All in all though it won't be too much.

My plan is to make the intake work. My bolt holes are 16 deg off vertical and just slightly inboard of the Magnum hole locations. Custom bent studs and a little grinding may make it work. The ports are taller, so may sculpt the outlets w/ epoxy to match my head. Hood clearance will be tight. I tested the fit when I had my intake off.

Not sure I can make the Magnum ECU work. I got one just to play with. I don't know if the crank sensor is used for EFI (sequential injection) or just spark control. If the later, I can do spark other ways. I put a 36-1 wheel on my crank pulley. I will probably use a Holley Commander 950 ECU I have with the Magnum harness. Another approach is a Megasquirt ECU, but I got the Holley ECU cheaper. I have a Magnum dizzy, but my idea is just for its cam sensor, for a custom ignition idea. I think the cam sensor is used only for EFI by the Magnum ECU. Like many people, I have many parts, some knowledge, but little time.

 

[TT'74]

Sounds like you've got what you need. Do a little reading on it from what ever you can find and if you have any questions I'll help as much as I can. All in all it doesn't take much time. When I did the OBD2 setup on my duster, which is my second efi engine, it only took me a few hours once I found the wiring diagrams. But that was with the engine and what not already in.

 

[TT'74]

I can't get them to flip right side up, so you can copy them to your own desktop to flip them if needed.

 

[briankaplan]

Call me stupid here. But don't you need a speed sensor also to make it work?
Thought the puter needed that input also.

 

[TT'74]

the speed sensor is a direct swap into any 727, 904, 899, A(500-518 ), (44-46)RE. What I did for my application was to source a speed sensor from a late 80's dodge truck that has output for both the electric sender, as well as a cable drive which operates my factory speedo.