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Idle Speed Motor (AIS) problems code 25

5K views 2 replies 2 participants last post by  jpmassa 
#1 · (Edited)
Sorry I posted this on 5.9 L specific forum first. Thought this forum might be better suited.

Any one offer some advice on fault code 25 problems? Recently had to replace the SBEC / engine computer. After replacement, got a new fault code I never had before = 25. Sure enough, the idle speed motor (AIS) motor attached to the throttle body stopped working immediately after engine computer replaced ... low idle, engine wants to die out at idle especially under load, no movement at all at the AIS motor.

Coincidence that the motor failed after ECM changed? So, then I replaced the idle speed motor for $75, but problem is not fixed, code 25 remains. Now I'm thinking maybe the engine computer is faulty here .. can't tell. No diagnostics in the CHilton manual for this one. Can't find any wiring problems. Suggestions for diagnosis? Or just replace the AIS motor again or replace the ECM (again)?

Thanks for reading, Jim.
 
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