Cruise Control Operation

ENGINE MANAGEMENT SYSTEM – V8

DESCRIPTION AND OPERATION 18-2-53

Cruise Control Operation
Cruise control is operated from the steering wheel mounted switches. Switch symbols are market dependent! There 
are 4 switches for cruise control.

1 Cruise control ON/OFF switch (O/I)
2 Cruise control accelerate/tip-up switch (+)
3 Cruise control decelerate/tip-down switch (-)
4 Cruise control resume switch.

The driver can enable cruise control at any time by pressing the ON/OFF (O/I) switch. Pressing this switch places the 
cruise control function into "stand by mode" and illuminates the instrument pack mounted cruise control lamp.

When in "stand-by" mode, pressing the "+", "-" or "RESUME " cruise switch once will activate the cruise control 
function and set the "set speed" equal to the current vehicle speed.

Note that the vehicle speed has to be greater than the minimum cruise control speed value of 26 km/h (16 mph) for 
the cruise control function to operate. There is no maximum speed limit.

Once the cruise control function is active, switch presses will have the following actions:

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Each "short" press on the "+" switch will cause the "set speed" to be increased by 1 km/h (tip-up function

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Each "short" press on the "-" switch will cause the "set speed" to be decreased by 1 km/h (tip-down function). 
Note that the "set speed" cannot be adjusted to lower than the minimum cruise control speed value

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A "continuous" press on the "+" switch will cause the vehicle to accelerate until the switch is released. The vehicle 
speed at the point the switch is released becomes the new "set speed"

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A "continuous" press on the "-" switch will cause the vehicle to decelerate until the switch is released. The vehicle 
speed at the point the switch is released becomes the new "set speed". Note that the "set speed" cannot be 
adjusted to lower than the minimum cruise control speed value

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A press on the "RESUME" switch when returned to "stand-by" mode will re-activate the cruise control function 
using the remembered "set speed".

Other aspects of the cruise control function are:

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Pedal over-ride function

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If the driver uses the accelerator pedal while cruise control is active, the "set speed" remains unchanged. 
Hence when the driver releases the accelerator pedal, the cruise control function will remain active and return 
the vehicle to the current "set speed"

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If the driver presses the "+" or "-" switches during pedal over-ride, the "set speed" will change to the actual 
vehicle speed when the switch is pressed.

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The cruise control function is not available in "low range". Note however, that if cruise control was active or in 
stand-by mode when low range was selected, the cruise function will automatically return to stand-by mode when 
high range is re-engaged, and the previous set speed is remembered.

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When in stand-by mode, pressing the "I/O" switch will disable the cruise control function, switch OFF the 
instrument pack mounted cruise control lamp, and the "set speed" will be lost

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The cruise control function will change from "active" to "stand-by" modes if:

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The driver brakes

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The driver presses the "O/I" switch

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The driver moves from "D" to "N" 

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The driver selects "low range"

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The DSC system activates above a defined level. This should be indicated to the driver by the instrument pack 
"DSC active" warning lamp.