Exhaust Door Control Unit -J883-, Checking: Notes

General Description 

The Exhaust Throttle Valve is located behind the NOx storage catalytic converter. There is an electric motor inside of the Exhaust Throttle Valve that moves the throttle plate with a gear. Adjustment of the throttle plate is infinite and can be adapted to respective load and speed of the engine. The Exhaust Throttle Valve has the following tasks: In certain operating conditions, a differential pressure is generated between the NOx storage catalyst and the turbocharger. This increase in pressure helps with Low Pressure EGR return.

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.
• Observe all safety precautions: SAFETY PRECAUTIONS .
• View clean working conditions: CLEAN WORKING CONDITIONS .
• For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .