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Anti-surge Strategies
The ECM incorporates software to control the rate of engine acceleration and deceleration. This
feature, referred to as the anti-surge strategy, “damps” the engines response when changing gear
(engine does not flare). It also improves the vehicles driving characteristics in circumstances when
the driver's demand is lower than the current engine speed (i.e. lifting off). The software inside the
ECM alters the rate at which the engine decelerates to suit the conditions. This rate will alter
according to the current engine rev/min, the target rev/min and the duration of engine deceleration.
The rate of deceleration will also increase if the driver depresses the clutch (activating the clutch
switch).
The anti-surge strategy is cancelled if the driver selects low range. This improves the engine
braking performance when the vehicle is travelling at low speeds.

Clutch Switch
The clutch switch is fitted only to vehicles equipped with a manual gearbox. The switch is an
hydraulic pressure switch and is located next to the clutch master cylinder. When the clutch is
engaged, i.e. pedal released, the switch will be in the open state. When the pedal is pushed and
the clutch is disengaged, the switch will change to the closed state. The ECM will suspend cruise
control operation in response to this change of state. The ECM will also reduce fuelling in
response to this signal, to reduce engine surging (dampens the effects of fast throttle transitions
to eliminate jerky vehicle movements). If the clutch switch fails at any time then the ECM will not
support cruise control operation. In addition, the engine will be more susceptible to surging at
times when the engine is decelerating quickly.

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Mvh Mads