Circuit Description
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
Idle Air Control (IAC) valve is controlled by PCM. PCM uses IAC to maintain a desired idle speed, which can vary depending on input to PCM and other criteria. DTC P0506 will set if PCM detects that idle speed is out of IAC systems range of control at idle.
DTC will set when the following conditions are present:
- DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0171, P0172, P0174, P0175, P0220, P0300, P0401, P0404, P0405, P0443, P0500-P0503, P1414 or P1441 are not set.
- Engine running for more than 60 seconds.
- ECT is greater than 140°F (60°C).
- IAT greater than 14°F (-10°C).
- BARO greater than 65 kPa.
- Ignition voltage 9-17 volts.
- Vehicle speed less than one MPH.
- Actual idle speed is 100 RPM less than desired idle speed.
- Above conditions met for 5 seconds.