P2008

Diagnostic Chart:

Schematic:

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 and 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.

DTC PARAMETERS
DTC P2008 will set if IMRC solenoid feedback voltage is between 2.6 and 4.6 volts (ECM pull-up voltage indicating an open circuit) when IMRC solenoid is commanded Off when:
^ Condition exists for longer than 0.5 seconds
^ Engine speed is greater than 40 rpm
^ Main relay voltage is between 8.0 and 18.0 volts

DTC P2008 diagnostic runs continuously once the above conditions have been met.

P2008 is a type D DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use Scan tool to monitor DTC P2008 LAST TEST with engine running. Wiggling wires while watching for a change from PASSED to FAILED may locate the area where an open in the wiring may exist.

IMRC solenoid resistance: 18-27 ohms