DTC P2008: Intake Manifold Runner Control Solenoid Control: Description

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Each (one per bank) variable intake manifold runner is a shaft with three flaps located inside the intake manifold, which is controlled by an externally located vacuum operated diaphragm. As the diaphragm moves above a certain engine speed/load range, the flaps cover intake ports, which change induction airflow characteristics. The ECM controls the intake manifold runner diaphragms by controlling their vacuum supply via the Intake Manifold Runner Control (IMRC) solenoid. The IMRC solenoid is supplied continuous manifold vacuum, which is transferred to the intake manifold runner diaphragms whenever the solenoid is energized. The ECM controls the solenoid by supplying the circuit ground. When the solenoid is commanded off (circuit not grounded), the voltage level at the ECM should be high (ignition voltage). When the solenoid is commanded on (circuit grounded), the voltage level at the ECM should be low. The ECM IMRC solenoid feedback circuit uses a pull-up voltage (2.6-4.6 volts), which allows the ECM to individually differentiate between an open, short to ground or short to voltage. DTC P2008 will set if the ECM detects an open IMRC solenoid control circuit when the IMRC solenoid is commanded off with engine running/cranking.