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Old 12-18-2009, 06:32 PM   #1
TJ_ti
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Default M50 (OBDI) to ODBII (Chassis) issues

I am wondering how the chassis to engine harness wiring is done, specifically wire #8. I can not get my swap going, it cranks but does not want to fire up. I have included a couple of pictures to show the wiring for the chassis (OBDII from a 1998 ti) to the M50 (ODBI from a 1994 325i) Do I have to splice wire #1 on to wire #8 on the X20 connector, or bypass it? I have included pics of what I am taking about. Also what other reasons would there be for no starting? I have followed Bluebimma's swap thread and mine is exactly the same other then I have cut the wires on the engine harness instead of the chassis harness, but I do not see how that would make a difference. I also have replaced the CPS and I know the fuel pump works, I also have 2 "413" red label ECU's and neither one seem to get it to work.



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Old 12-18-2009, 08:29 PM   #2
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checking again the only wire u have to cut is pin #7 on x20 conector...usualy lime green..mine was purple...it should work after that ..otherwize ur grounds might be wrong..good luck ..
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Old 12-18-2009, 08:35 PM   #3
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It says to cut #8 and attach it to wire #1 on the X6031 connector, just dont get that, but Bluebimma uses the bottom of the connectors, the chassis side rather then the engine side, thats where I am confused.
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Old 12-18-2009, 08:45 PM   #4
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i believe thats for the cluster.....on the x20 conector u have to cut the #7 wire thats for the ews system...wich will let ur car turn on....i dint do anything with the x6031 conector
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Old 12-18-2009, 08:47 PM   #5
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u have to use the engine harnes ..not the chasis harnes..open up the x20 harnes n ull see the #s on the inside jst look for the #7 pin and cut the wire..thats what i had to do ..and she started rite up..beautiful thing,,,lol
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Old 12-18-2009, 08:50 PM   #6
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Hm...this is what has me confused. And you said that you did nothing with it, just cut wire #7

I see this



and this

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Old 12-19-2009, 01:24 AM   #7
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0ok i read again threw his thread...and what hes doin w the x6031 conector w wire #1 and#8 is for the check engine light....if im not wrong.. my engine harnes came w 1 conector x20..all i had to do was cut the #7 wire on it and my engine fired right up...
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Old 01-13-2010, 09:27 PM   #8
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Time for an update, I am getting power to the main relay, but nothing for the fuel pump relay, this was tested on a volt meter. I am thinking that it may be a ground issue, not 100% though. Any other thoughts?
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Old 01-14-2010, 02:56 AM   #9
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are you sure ur ground /power wires are corect...did u eliminate the fuel regulator under the car?..
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Old 01-17-2010, 09:26 PM   #10
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I checked it again and I am getting power to the main relay and the fuel pump, still diagnosing, I have to get there soon, lol.
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Old 01-17-2010, 09:51 PM   #11
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are u getting fuel to the motor..?. make sure ur fuel lines are correct...power and ground are correct...
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Old 01-18-2010, 12:19 AM   #12
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I pulled the fuel line off the front side of the fuel rail, jumpered the fuel pump relay and NOTHING was coming out, but the pump was running. I am going to have to see whats going with the fuel lines.
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Old 01-18-2010, 12:39 AM   #13
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That's one of the problms I had..fuel lines were mixd up on the fuel rail...and it was fine..u took out the fuel regulator under the car next to the fuel filter... U can use the same fuel filter jst run fuel hose to the fuel rail....if anything try spraying some gas in the throtle body and try starting it..tthats how I found out it was fuel issue not a spark problmm...are you geting spark?

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I pulled the fuel line off the front side of the fuel rail, jumpered the fuel pump relay and NOTHING was coming out, but the pump was running. I am going to have to see whats going with the fuel lines.
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Old 01-20-2010, 04:10 PM   #14
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Well I think its the FPR, I took the line off running to the regulator and there is plenty of fuel coming out of it when the fuel pump is running, so I am getting a new FPR and going from there.
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Old 01-20-2010, 04:26 PM   #15
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Hhhmmm....wierd ..I dnt kno what else it could be.. Post some piks of ur wiering..
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