DESCRIPTION AND OPERATION
RANGE ROVER 4.33
Glow Plug Timer
The glow plug timer receives a constant battery feed from the 100A fuse located in the fuse
holder (C1875) on an R wire, and a second feed from the energised ECM relay (C1895) via
fuse 2 of the engine compartment fuse box (C0570) on an R then RW wire.
When all starting parameters have been met, the ECM (C0606) provides a control feed to
the glow plug timer (C0190) on a BR wire. The glow plug timer (C0190) will now power the
glow plugs as follows:
l Glow plug number 1 (C0476) on a BG wire.
l Glow plug number 2 (C0477) on a BP wire.
l Glow plug number 3 (C0478) on a BY wire.
l Glow plug number 4 (C0479) on a BR wire.
l Glow plug number 5 (C1500) on a BW wire.
l Glow plug number 6 (C1501) on a BN wire.
All six glow plugs are earthed via their fixings. The glow plug timer (C0190) is earthed on an
NO wire.
The ECM (C0606) monitors the fault status of the glow plug timer (C0190) via a BY wire.
Starter Motor
The battery (C1641) provides a constant battery feed to the starter motor solenoid (C0178)
on an R wire. Operation of the starter solenoid is controlled by the immobilisation ECU.
When the immobilisation ECU (C0059) receives an ignition crank feed from the ignition
switch (and all other starting parameters have been met) it provides a feed to the starter
motor solenoid (C0179) on a B then BY wire. The energised starter solenoid allows the
battery feed to power the starter motor.
The starter motor (C0823) also provides an 'engine start' signal back to the ECM (C0606)
on a BG wire.
Fuel Pump
When the engine is started, the ECM (C0331) provides an earth path for the fuel pump relay
coil (C2022) on a BP wire. The energised fuel pump relay (C2022) provides a feed to the
fuel pump (C0114) on a WU wire. The fuel pump (C0114) is earthed on an N wire.
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