Question about 2001 Ford Focus
The idle is computer controlled. It takes a reading from the crankshaft position sensor as well as the camshaft position sensor along with basic information from other sensors, processes it and sends a pulse signal to the intake air control valve (IAC). The IAC valve is positioned to allow air to bypass the throttle plate and control the idle. Once the throttle is opened the IAC is commanded on 100% until the throttle is closed. In short, a scan of the pids needs to be done to determine whether the processor is commanding the IAC on properly or if the IAC just isn't responding properly.
A scan for codes can be done but many times an IAC won't throw a code so the sensor pids really need to be performed to determine the root cause.Good luck.
Posted on Apr 07, 2011
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