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ECM not communicating with scanner


rusty ol ranger

2.9 Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
13,864
City
Michigan
Vehicle Year
1987
Engine
2.9 V6
Transmission
Manual
My credo
A legend to the old man, a hero to the child...
86 Bronco II 2.9

Im still having a few goofy issues with this thing. It falls on its face at middle RPMS's, sometimes wants to surge and stall at idle...just kinda weird erratic stuff.

I plugged my scanner in and during the KOEO test everything goes off without a hitch. However, during KOER test the ECM wont even talk at all to the scanner.

The scanner works, it does fine on my 97 460 and 87 2.9.

This almost has to be an ECM issue right? The original ECM wouldnt communicate during either test, the one currently in it is the old one out of my 87.
 
@rusty ol ranger
Have you tried to pull codes from the instrument panel, key on/off 5 times?
 

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