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AJ-V8/5HP24
54
Engine Management
Vehicle Cruise Control
The ECM operates the vehicle cruise control
system, in all forward gears, in response to driver
inputs through the master, SET+, SET-, CANCEL
and RES switches.
When the master switch is pressed, two 12 V
ignition supplies are connected to the ECM, one
direct and one via the brake switch. The LED in
the switch comes on to indicate the system is
armed.
With the system armed, a momentary press of
either the SET+ or the SET- switch engages
cruise control, provided the vehicle speed is
28 km/h (17.5 mph) or above. The ECM
memorizes the current road speed as the `set’
speed and signals the vacuum system to operate
the mechanical guard. The inputs from the
position sensors in the electronic throttle allow
the ECM to monitor and adjust the mechanical
guard and the throttle valve to maintain the set
speed.
The vacuum components are installed in a line
connected between the induction elbow and the
vacuum actuator on the electronic throttle. In the
vacuum system:
• the check valve isolates the system from
the induction elbow at wide open throttle
when there is little or no vacuum available
• the reservoirs extend the time (to
approximately 20 minutes) that, at wide open
throttle, sufficient vacuum can be maintained
in the system to operate the vacuum
actuator
• VSV 1 regulates the vacuum applied to the
vacuum actuator to control the position of
the mechanical guard
• VSV 2 connects the vacuum actuator to
atmosphere to release the mechanical guard
when cruise control is disengaged
• VSV 3 is a back-up for VSV 2 (because cruise
control disengagement is safety critical)
• filters on the atmospheric ports of VSV 2 and
VSV 3 prevent moisture ingress.
CRUISE CONTROL STEERING WHEEL
SWITCHES
CRUISE CONTROL MASTER SWITCH
303-131
303-132