Control valve, swirl throttle
| Control valve, swirl throttle |
The task of the control valve is to convert electronic instructions from the EDC 15 control module into negative pressure that affects the diaphragm in the swirl throttle adjuster. The negative pressure is taken from the engine vacuum pump, which always generates a pre-determined negative pressure.
The control valve pin 2 is connected to the control module pin 60 and pin 1 is connected to the main relay pin 87.
The control valve is grounded through control module pin 60 with a 140 Hz PWM pulse. The timing ratio determines the magnitude of the negative pressure in the hose to the swirl throttle adjuster by which means the position of the swirl throttle can be controlled.
| Diagnostics |
If the control module output is short-circuited to B+, diagnostic trouble code P1111 will be generated.
If the control module output is short-circuited to ground, diagnostic trouble code P1110 will be generated.
System reaction to a fault
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No reactions.
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If the swirl throttle remains closed, the engine power at speeds above approx. 3500 rpm will be reduced. This is due to insufficient air mass/combustion.
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