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Charge air control valve

Charge air control valve



The control valve is used to convert electronic instructions from ECM using a vacuum that can act on the diaphragm in the wastegate. This vacuum comes from the engine vacuum pump, which always attains a predetermined underpressure.

Control valve pin 2 is connected to control module pin 97 and pin 1 receives B+ from fuse 14.

Through control module pin 97, the control module is grounded with a 140 Hz PWM pulse. The frequency determines the magnitude of the vacuum in the hose to the wastegate and consequently the position of the control rod can be controlled.

Diagnostics

If the control module output is short-circuited to B+, DTC P0246 will be generated.

If the control module output is short-circuited to ground/break, DTC P0245 will be generated.

If the actual boost pressure is too high in comparison with the desired boost pressure, DTC P0244 will be generated.

If the actual boost pressure is too low compared with the desired boost pressure, DTC P0243 will be generated.


System reaction to a fault

• Exhaust recirculation and boost pressure control are disengaged.

• The idling speed will be set to 1000 rpm.

• The following limitations apply: Pedal position sensor adjustable to max 30%, fuel quantity max 30 mm 3 /combustion, fuel rail pressure max 60 M Pa.