3.5L Code 25 - High RPM @ Idle

My son's 1996 3.5L Eagle Vision TSI (92K miles) has started idling at ~1600
RPM (even when the engine is warm). The check engine light is lit and the
on/off/on/off/on key trick displays a code 25, which appears to be related
to the AIS.

I've cleaned the two throttle bodies and attempted to find any loose or
cracked vacuum lines, but they all appear to be fine. At this point, I'd
appreciate ideas on other possible causes and any troubleshooting procedures
that might be employed to try to isolate the problem.

Otherwise, the car looks great and seems to run pretty well for being 12+
years old. Thanks in advance for your thoughts.

Bob

 

Code 25: A short or open condition detected in one or more of the idle air
control motor circuits.

 

What did you find when you inspected the AIS motor and its wiring?

 

Everything looked good from a physical connection standpoint. Is there a
test procedure that can be performed with a simple DVM to verify the wiring
continuity? Thanks.

Bob

 

I don't have an FSM for the first-generation LH body, sorry.

 

My son has an appointment at the local 5-star Chrysler dealer tomorrow. He
told them it had a CEL and code 25 and was warned it will be $125 for the
diagnostic only ...I'll let you know what they find so others can hopefully
benefit.

BTW, The car was mine originally and is now officially 12+ years old. Since
I've done all the maintenance over those years, it has been back to the
dealer only twice and both times were to perform recalls, with no cost to
the owner.

Bob

 

Get the specific obd2 code, for $125 you could get yourself a decent code
reader.