DESCRIPTION AND OPERATION
RANGE ROVER 4.47
V8
Fusible link 2 (C0632) provides a constant battery feed to the ECM relay (C1895) on an R
wire. Operation of the ECM relay (C1895) is controlled by the ECM (C0604) on an N wire.
The energised ECM relay (C1895) provides a feed to fuse 51 of the passenger compartment
fuse box (C0584) on an RW wire. Fuse 51 (C0584) is connected to the ABS ECU (C0506)
and the steering angle sensor (C0862) by a pair of RW wires.
Td6
The 100A fuse within the fuse holder (C1878) provides a constant battery feed to the ECM
relay (C1895) on an R wire. Operation of the ECM relay (C1895) is controlled by the ECM
(C0604) on an N wire. The energised ECM relay (C1895) provides a feed to fuse 51 of the
passenger compartment fuse box (C0584) on an RW wire. Fuse 51 (C0584) is connected
to the ABS ECU (C0506) and the steering angle sensor (C0862) by a pair of RW wires.
ABS
Wheel Speed Sensors
The ABS ECU (C0506) provides a feed to all four wheel speed sensors as follows:
l To the LH front wheel speed sensor (C0516) on an R wire.
l To the RH front wheel speed sensor (C0517) on a Y wire.
l The LH rear wheel speed sensor (C0502) on a W wire.
l To the RH rear wheel speed sensor (C0503) on a G wire.
The wheel speed sensors are hall effect sensors, and provide the ABS ECU with a square
wave form signal. This signal rises and falls between approximately 2.5V and 0.75V. By
measuring the frequency of the waveform, the ABS ECU can calculate the speed of the road
wheel. The sensors provide the ABS ECU (C0506) with a wheel speed signal as follows:
l From the LH front wheel speed sensor (C0516) on a UR wire.
l From the RH front wheel speed sensor (C0517) on a UY wire.
l From the LH rear wheel speed sensor (C0502) on a UW wire.
l From the RH rear wheel speed sensor (C0503) on a UG wire.
DSC
DSC Switch
DSC is active as soon as the ignition switch is turned to the 'ignition' position. DSC can be
switched off by pressing the non-latching master switch located on the centre console.
When the ABS ECU (C0506) receives a momentary feed from the DSC switch (C0700) on
a BY wire, it suspends DSC operation. Pressing the switch a second time reinstates DSC.
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