DESCRIPTION AND OPERATION
4.38 RANGE ROVER
CRUISE CONTROL
DESCRIPTION
General
The cruise control system is enabled by pressing the non-latching master switch located on
the LH steering wheel switch pack. The system is controlled by the Engine Control Module
(ECM), which receives commands from the 'SET+' and 'RES' switches, which are also
located on the LH steering wheel switch pack. The ECM interprets the messages sent from
the steering wheel switches and then controls the speed of the vehicle using electric throttle
intervention.
For a detailed description of cruise control operation, refer to the Engine Management –
Td6 or Engine Management – V8 section of the Description and Operation Workshop
Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 53 of the passenger
compartment fuse box (C0632) on an R wire. Fuse 53 (C0583) is connected to the ignition
switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) by an R wire. When the ignition
switch is turned to the 'auxiliary' position, current flows across the switch (C0099 on Td6
vehicles, C0028 on V8 vehicles) to fuse 9 of the passenger compartment fuse box (C0585)
on a PB wire. Fuse 9 (C0587) provides an auxiliary ignition feed to the rotary coupler
(C0082) on a PY wire.
When the ignition switch is turned to the 'ignition' position, current flows across the switch
(C0099 on Td6 vehicles, C0028 on V8 vehicles) to fuse 31 of the passenger compartment
fuse box (C0585) on a G wire. Fuse 31 (C0587) provides an ignition feed to the Engine
Control Module (ECM) (C0331) on a GB wire.
Throttle Position (TP) Sensor
The TP sensor (C0787) comprises two potentiometer tracks. Track 1 is provided a 5V
reference feed by the ECM (C0331) on a Y wire. Track 2 is provided a 5V reference feed by
the ECM (C0331) on a YG wire. Track 1 provides a throttle position signal back to the ECM
on a W wire. This signal will be approximately 0.5V with the pedal at rest, and 2V at full
throttle. Track 2 provides a throttle position signal back to the ECM on a WG wire. This signal
will be approximately 0.5V with the throttle at rest, and 4.5V at full throttle. The ECM also
provides an earth path for track 1 and track 2 on NG and UG wires respectively.
For more information of TP sensor operation, refer to the Engine Management – Td6 or
Engine Management – V8 section of the System Description and Operation Workshop
Manual.
To Next Page
Loading...
