DESCRIPTION AND OPERATION
RANGE ROVER 4.43
ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – ZF
DESCRIPTION
General
The ZF 5HP24 transmission is an electronically controlled, five speed unit and is mated with
the V8 petrol engine. The transmission is controlled by an Electronic Automatic
Transmission (EAT) ECU, which contains software to provide operation as a semi-automatic
'Steptronic' transmission. This allows the transmission to be operated as a conventional
automatic unit by selecting P, R, N, or D on the selector lever. Movement of the selector
lever across the gate to the 'M/S' position puts the transmission into electronic 'Sport' mode.
Movement of the selector lever in a lateral position to the + or – positions puts the
transmission into electronic manual 'Steptronic' mode.
For a detailed description of ZF automatic transmission operation, refer to the Automatic
Transmission – ZF 5HP24 section of the System Description and Operation Workshop
Manual.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 2 and fuse 53 of
the passenger compartment fuse box (C0632) on an R wire. A permanent battery feed is
also supplied to the 50A fuse contained within the fuse holder (C1875) on an R wire. This
fuse (C1876) provides a constant battery feed to the transfer box ECU (C1855) on a pair of
R wires.
Fusible link 2 of the passenger compartment fuse box (C0591) provides a constant battery
feed to the ECM relay (C1895) and fuse 4 of the engine compartment fuse box (C0570) on
a pair of R wires. 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 1 of the engine
compartment fuse box (C0570) on an RW wire. Fuse 1 (C0570) is connected to the EAT
ECU (C0932) by a pair of RU wires. The EAT ECU (C0932) is earthed on N wires.
Fuse 4 of the engine compartment fuse box (C0570) is connected to the EAT ECU (C0932)
by an R wire.
Fuse 53 of the passenger compartment fuse box (C0583) is connected to the ignition switch
(C0099) by an R wire. When the ignition switch is turned to the 'auxiliary' position, current
flows across the switch (C0099) to fuse 37 of the passenger compartment fuse box (C0587)
on a PB wire. Fuse 37 (C0587) provides an auxiliary ignition feed to the transfer box ECU
(C1319) on a PU wire.
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