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98 zj ax-15 swap with 98 xj ax-15 ecm

Blue99xj

NAXJA Forum User
Location
Cape cod ma
I know it’s not a xj but I manual swapped me 98 zj 4.0. I used the 98 xj ecm and received no check engine light and the motor runs great. However the ac in the zj no longer engages. I believe it is due to the xj ecm looking for the electric fan found in xjs. Anyone know how to fool the xj ecm into thinking there is a electric fan still?
 
Try installing a dummy relay on the circuit?

AFAIK the ecm is looking for the relay, not the fan itself. You wouldn't even need to wire up the load side of the relay, just the control side.

HTH
 
I've gone through the pin out of the ecm and I found several item regarding the fan. c27 radiator fan relay control. c48 radiator fan request. c22 ac switch sense. c90 ac select input. I just don't know what the ecm is looking for on those circuits to be able to supply it myself.
 
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