53, , if all the grounds are good.
and power is solid , then it must be the goffy calif. issue.
if you can get 28mpg + , its good. best case.
we dont get many 53s here.. and they are no fun to get.
board swap/case is possible. very astute !
other possible a new Main relay?
sensor ground ( there is a special wire called sensor ground) , i think? it must never touch body. It might be sensed, ( i dont know for sure)
some ECU (for sure) do sense ground and adjust readings for any error on ground.
this makes sensor readings very accurate.
i do not know all the secrets of this ecu. it is interesting to me any 53.
the manuals are dumb as brick on this.
check power and ground, replace ECU.
yah , right......
if a diff. ecu gave 53, then we'd know for sure its, body wiring or a shorted sensor.
not sure what ecu will throw if something shorts out +5vRef pin.
I do know a 8v ecu this blows traces off the PCB .
on on 16v, this looks diff. by my observations.
it too , might be sensed for errors on 16v ecu.
i do hope your 75 makes car save tons of fuel and gives a return on investment FAST.
I do .
cheers.
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