Circuit/System Description

The position of the turbocharger vanes is controlled by the engine control module (ECM). The ECM utilizes a turbocharger vane control solenoid valve and a turbocharger vane position sensor to control the turbocharger vanes. The ECM will vary the boost dependent upon the load requirements of the engine. The vane control solenoid valve uses 2 circuits, a high voltage control circuit and a low reference circuit. The ECM uses a pulse width modulation (PWM) on the high control circuit to control the solenoid valve. The ECM provides a ground on the low reference circuit. The ECM will detect if the automatic turbocharger learn has failed or the commanded position of the turbocharger vanes does not match the actual position by more than 15 percent. Refer to Turbocharger Description and Operation .

Conditions for Running the DTC

• DTC P0117, P0118, P2563, P2564, P2565, P2228, P2229 are not set.
• The battery voltage is more than 11 volts.
• The ECM is commanding the turbocharger vanes open or closed during a position learn process.
• The engine speed is between 600-750 RPM.
• The engine coolant temp (ECT) is between 160-205°F (71-96°C).
• DTC P003A runs continuously when the above conditions are met.