Northstar Engines and System Technical Discussion Discussion, P030 Code on '93 STS in Cadillac Engine Technical Discussion; Can anyone recommend a solution to the "ISC RPM Out Of Range"
message or has anyone experienced it an found ...
Can anyone recommend a solution to the "ISC RPM Out Of Range"
message or has anyone experienced it an found a solution.
the first thing i'd check for is a vacume leak..this seems to be the most likly cause..if you have a high idle, over 1000 rpm and the computer can't correct it, then this is what i'd look for. also where there any other codes set or just this one..
heres some info on how it works..
The PCM controls idle RPM by increasing or decreasing the throttle opening using the Idle speed controler. The ISC motor will control engine RPM any time the tps is closed. Code P030 sets because the actual RPM never reaches desired RPM signifying a slow or failed ISC motor.