On my 92 Grand Caravan 3.3 I have a high idle problem that
consistently trips the Code 25 (IAC circuitry). Here is what I have
checked and replaced.
Idle Air Conntrol Motor
Swapped out another ECM from another Caravan
Cleaned throtle body area and replaced TBI gasket.
No known vacuum leaks or other gasket leaks
No other codes found
The code 25 immediately sets itself even after I disconnect the battery
for an extended period. I even disconnected the PCM and reconnected.
It will show the code before I ever start the vehicle again. It
sets itself when key is in on position and checks voltage.
Resistance tests appear normal. For those who know a ton more than me:
What would be your next steps if you were in my shoes? Thanks