Swirl throttle
| Swirl throttle |
The purpose of the swirl throttle is to close the tumble duct at light engine loads, forcing all the air to take the longer swirl duct. This increases the air speed and provides better cylinder filling. When the engine speed and thus the amount of air increase, the tumble duct throttle opens to make the air required by the engine available.
The timing of the swirl throttle is taken from a table, based on engine speed and injected fuel quantity. This timing value is sent to the amplifier control where the signal is amplified and compensated for the battery voltage, see table.
| Diagnostics |
A DTC related to the swirl throttle function will result in:
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CHECK ENGINE
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Somewhat reduced performance.
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