Charge air control valve
| Charge air control valve |
The task of the charge air control valve is to convert electronic instructions from the PSG 16 control module to regulate a vacuum that can affect the diaphragm in the wastegate, turbo. The vacuum comes from the engine's vacuum pump, which always produces a predetermined underpressure.
Control valve pin 2 is connected to the control module pin M13 and pin 1 receives B+ from fuse 16B.
The control valve is grounded with a PWM pulse of 140 Hz through control module pin M13. The stroke relationship determines the size of the vacuum in the hose to the wastegate, turbo and with that, the position of the control rod can be controlled.
| Diagnosis |
If the control module output is short-circuited to B+, diagnostic trouble code P0246 will be generated.
If the control module output is short-circuited to ground/broken, DTC P0245 will be generated.
If the actual boost pressure is too low in comparison with the desired boost pressure, diagnostic trouble code P0244 will be generated.
If the actual boost pressure is too high in comparison with the desired boost pressure, diagnostic trouble code P0243 will be generated.
System reaction to a fault
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The control functions for exhaust gas recirculation, swirl throttle and charge air are disengaged.
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Boost pressure control is regulated with a constant value.
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Power reduction by limiting torque to:
200 Nm up to 2000 rpm 170 Nm up to 2250 rpm 120 Nm up to 2500 rpm 70 Nm up to 3000 rpm |
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CHECK ENGINE
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