Control Valve Control Unit -J808-, Checking

General Description 

The Engine Control Module -J623- computes the nominal charge pressure from the requested torque. If the actual charge pressure deviates from the nominal charge pressure, the wastegate is opened further by the Control Door Adjustment Motor -V380- (charge pressure decreases) or closed further (charge pressure increases). The rapid response of the Control Door Adjustment Motor -V380- ensures that the wastegate opens quickly in overrun mode, thereby reducing the pumping effort of the turbocharger. The wastegate is closed in the start position. The Control Door Adjustment Motor -V380- is activated by the PWM signal, and the Control Valve Position Sensor -G584- provides position feedback.

The Control Valve Control Unit -J808- contains the following components:

• Control Door Adjustment Motor -V380-
• Control Valve Position Sensor -G584-

The Control Valve Control Unit -J808- components cannot be serviced separately, and must be serviced as a unit.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.

Test requirements 

• Fuses OK.
• Battery voltage OK.
• Switch OFF all electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
• Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
• Coolant Temperature: ≥ 80° C.
• Observe all safety precautions: SAFETY PRECAUTIONS .
• View clean working conditions: CLEAN WORKING CONDITIONS .
• For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

Test Procedure