1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,256 Posts
Welcome to Allpar. If the RPM's do eventually drop down, my guess would be a faulty AIS, AIS circuit or AIS drivers in the logic/power module.
The DRB II or III scan tool can report the 'target RPM and the AIS steps' open and the 'actual RPM and AIS steps' open. The DRB II or III can also drive the AIS open or closed to see if it is able to comply with commands. It is a 4-wire device. 2 to drive the motor open or closed and 2 for 'step' feedback to the module.
Diagnose this first before replacing parts. It may not set a fault code.
The DRB II or III scan tool can report the 'target RPM and the AIS steps' open and the 'actual RPM and AIS steps' open. The DRB II or III can also drive the AIS open or closed to see if it is able to comply with commands. It is a 4-wire device. 2 to drive the motor open or closed and 2 for 'step' feedback to the module.
Diagnose this first before replacing parts. It may not set a fault code.