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Galant VR-4 Forums » Galant VR-4 » How To and Info Archive » Using 90 eprom in 91+ cars or vise-versus.
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Using 90 eprom in 91+ cars or vise-versus.


Terry Posten
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Galant VR-4 org Post #: 440452 posted 02/06/07 09:18 PM     Remind Me!  Send Private Message   Edit Post      




1992 Galant VR4 click
2010 Outlander GT S-AWC Premium w/nav (wife daily)
2010 Jaguar XF Premium Luxury (my daily

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borat
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Galant VR-4 org Post #: 441785 posted 02/09/07 07:40 AM     Remind Me!  Send Private Message   Edit Post      
BTW, this is also valid info for the JDM cars e.g. if fitting a 1991 MD165808 ECU into a 1989 VR4 (for instance), the above wire swap is necessary .

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dsm_drew
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Galant VR-4 org Post #: 442502 posted 02/11/07 09:06 AM     Remind Me!  Send Private Message   Edit Post      
If I may add this link: http://www.dsmtuners.com/forums/showthread.php?t=170393

Shows how to remove/swap the pins in the harness.

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jepherz Galant VR4.org Moderator
Too Clean
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Galant VR-4 org Post #: 442874 posted 02/12/07 11:30 AM     Remind Me!  Send Private Message   Edit Post      
Using a '91+ ECU in a '90 is not as simple as just switching the two wires. More info here:
http://www.dsmchips.com/1990ecu.html



-Jeff
1881/2000
50/1000

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keydiver
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Galant VR-4 org Post #: 443159 posted 02/12/07 08:45 PM     Remind Me!  Send Private Message   Edit Post   
It is also worth mentioning that there is only ONE known issue with using the 1990-style ECU in your 1991+ DSM: the tach pulses are inverted, so the ECU never sees misfires, so it will never throw a Code 44 if you have a bad transistor or coilpack.
Otherwise, it runs perfect by just swapping pins 6 and 14, as shown above.

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