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750-->900ss engine swap, and ecu swap problem

Started by Monsterlover, January 31, 2009, 02:22:06 PM

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Monsterlover

January 31, 2009, 02:22:06 PM
Well, the engine swap wasn't the issue.

I have discovered that the 750 ecu and 900 ecu are not interchangeable

The harnesses have different pinouts.

Details as follows:

900plug, left to right, top to bottom, mismatches between plugs are in red (as viewed from the ecu's perspective)

yellow/gray - blank - white/red (or red/white) - blk - blk - blank - brown

green - pink/blk 1 - blue/blk 2 - red/blue (or blue/red) - gray - gray/blk 3

blank - white - blue - yellow - white - white/purple 4

red - blank - blue/white - blue/gray - blank - orange/blue - brown
____________________________________________________________________________

750 plug, left to right, top to bottom, mismatches between plugs are in red

yellow/gray - blank - white/red - black - black - blank - brown

green - blank - blank - red/black - gray - pink/black

blank - white - blue - yellow - white - purple

red - blank - black/white - blue/gray (or gray/blue) - blank - orange/blue - brown

____________________________________________________________________________

I have a spare 900 harness (hacked, but traceable) that Im using for reference.

Near as I can tell, on that harness, 1 goes to the relay that's up by the ecu.  On the 750 it has a plug, on the 900 harness it's hard wired.

2 goes to a 2 pin plug with yellow weather packing (3 position, only two used) and I don't know what this is for as the 750 is track only, and is missing any extraneous wiring.

3 goes to a 2 pin white plastic plug, that goes to the starter solenoid

4 goes to one of the fuel injector plugs

As I see it, 4 won't matter as the pin on the ecu matches the fuel injector on the bike, so that should work.

3 Im having trouble with as the starter solenoid plug uses wires of a different color and pin location on the ecu plug.  Not sure what I'll do about that yet.

1 and 2 are obvious as they're missing from the 750 harness.  I had thought about switching plugs but that's a lot of cutting and soldering that Im not sure I want to get into.

As the bike sits now, it will crank, but the fuel pump will not run when plugged into the 900 ecu.

What's the easy way to get this thing to run?
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

caperix

#1
January 31, 2009, 04:12:14 PM
The best way to get it running would be an wiring harness & ECU that match the engine.  Do you have wiring diagrams for both the bike the engine came from and your bike?  Your post makes it sound as though you are going by wire color & what they plug into only.  Diff. ECU's can contol components differently; switched power vs switched ground, PWM, ect.  Are you using the 900 ECU or the 750, does the bike/ECU have an emobilizer?

Duck-Stew

#2
January 31, 2009, 04:44:57 PM
What year 900 ecu are you running and what year 750 harness are you trying to get to work?
Bike-less Portuguese immigrant enjoying life.

ducpainter

#3
January 31, 2009, 08:56:16 PM
I know the 750 is a 99
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Monsterlover

#4
February 01, 2009, 05:40:51 AM
The 900 engine and ecu are from about the same time period as the 99 750 frame.  I do not know the exact year but there is no immobilizer on it.  As I recall the seller said it was a 99 or 2000 maybe. 
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

ducpainter

#5
February 01, 2009, 05:58:59 AM
Is the engine/ecu from an SS or Monster?
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


2001cromo

#6
February 01, 2009, 07:05:51 AM
Quote from: ducpainter on February 01, 2009, 05:58:59 AM
Is the engine/ecu from an SS or Monster?

I think Nate's on the right track here.
First off, it's a 1.5 ECU system. And from what I'm seeing it's the same issue I had when I tried to swap a 1.5 ECU from an SS into my Monster. Basically it wouldn't run and the fuel pump would do funny things. This was because a few pinouts were different between the 2 ECU's for each the SS and the Monster.

So basically I suggest trying an ECU from the other type and I think it will work.

Nate, I take it this was your old 750?

Monsterlover

#7
February 01, 2009, 08:44:43 AM
Quote from: ducpainter on February 01, 2009, 05:58:59 AM
Is the engine/ecu from an SS or Monster?

It's all from a 900ss...
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

ducpainter

#8
February 01, 2009, 03:06:17 PM
Yes, this is my old SS.

I'm wondering if the 900SS had the same mixture of ecu/ignition as the earliest monsters where the ecu controlled only fuel.

We need someone that knows something. :P
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


2001cromo

#9
February 01, 2009, 03:15:48 PM
Quote from: ducpainter on February 01, 2009, 03:06:17 PM
Yes, this is my old SS.

I'm wondering if the 900SS had the same mixture of ecu/ignition as the earliest monsters where the ecu controlled only fuel.

We need someone that knows something. :P

Thats what I was thinking.
When I got an extra ECU from Stew a while back to have flashed by BCM they explained that there were actually 2 different ECU's (one for the SS and one for the Monster) even though they looked identical, the numbers on them were slightly different.

Anyway. I've got an extra one for a monster that you're welcome to borrow to confirm. Jay's got it up at ECS at the moment.

Just let me know.
Terry

Monsterlover

#10
February 01, 2009, 06:35:36 PM
Quote from: 2001cromo on February 01, 2009, 03:15:48 PM
Thats what I was thinking.
When I got an extra ECU from Stew a while back to have flashed by BCM they explained that there were actually 2 different ECU's (one for the SS and one for the Monster) even though they looked identical, the numbers on them were slightly different.

Anyway. I've got an extra one for a monster that you're welcome to borrow to confirm. Jay's got it up at ECS at the moment.

Just let me know.
Terry

Terry,

I'd love to try an M900 ecu to see what happens!

Ill PM my address (I'd cover shipping) but hold off on sending it.  Somewhere I have a M900ie service manual scanned to .pdf on a CD.  If I can find it I can check the wiring colors and locations off the ecu and probably get a good idea if it will match up.

If it looks like it will I'll let you know.

[thumbsup]
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

Duck-Stew

#11
February 01, 2009, 08:09:36 PM
IIRC (& I'm drunk right now) there was a wiring harness change between '99 & '00-'02 and it involved the wiring going into the ecu making the '99 SS ecu a one year only thingy.

So, you might be hosed w/o a '99 SS900 ecu (or '98 SS900 ecu from Europe)...
Bike-less Portuguese immigrant enjoying life.

Monsterlover

#12
February 01, 2009, 08:14:10 PM
I have the ss900 ecu but  not sure of the exact year. The harness is 99 750ss
"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**

2001cromo

#13
February 01, 2009, 09:58:02 PM
Ok, so call me crazy, but why not use a Monster harness and ECU that might just be a little more common?

Duck-Stew

#14
February 02, 2009, 03:21:46 AM
Completely different plugs for the gauges and the components are more spread out on the SS.

And (sober now) I *know* there are differences between the '99 (& European '98) SS ecu's & the '00 - '02 bikes.  It may be easier to have the '99 SS750i.e. ecu reflashed with DP900 specs as the internal components of the ecu are the same, just the programming is different.

BTW, I don't have any '99 SS900i.e. ecu's hangin' around...
Bike-less Portuguese immigrant enjoying life.
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