DESCRIPTION AND OPERATION
4.30 RANGE ROVER
DIAGNOSTIC SOCKET
DESCRIPTION
General
The diagnostic socket is located behind an access panel on the drivers side of the fascia.
The socket is constructed to SAE directive J1962 standard and allows attachment of
TestBook or T4. The diagnostic socket allows detailed fault diagnosis checks to be carried
out on the vehicle via an ISO 9141 K Line Bus and the Diagnostic DS2 Bus.
OPERATION
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 15 and fuse 53 of the
passenger compartment fuse box (C0632) on an R wire. Fuse 15 (C0586) provides a
constant battery feed to the diagnostic socket (C0040) on an RUY wire.
Fuse 53 (C0583) provides a constant battery feed to the ignition switch (C0099 on Td6
vehicles, C0028 on V8 vehicles) on an R 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 5 of the passenger compartment fuse box (C0585) on a G wire. Fuse 5
(C0587) provides an ignition feed to the diagnostic socket (C0040) on a GW wire. The
diagnostic socket (C0040) is earthed on a pair of NB wires.
K Line Bus
The following are connected to the diagnostic socket (C0040) via the K Line Bus on WP
wires:
l Transfer box ECU (C1319).
l ABS ECU (C0506).
l LH Xenon Lamp ECU (C0009).
l RH Xenon Lamp ECU (C0011).
l Steering angle sensor (C0862).
l Instrument pack (C0233).
Diagnostic DS2 Bus
The following are connected to the diagnostic socket (C0040) via the Diagnostic DS2 Bus:
l The V8 ECM (C0331) on WPY and B wires.
l The Td6 ECM (C0331) on WPY and B wires.
l The ZF automatic transmission ECU (C0932) on a WPY then WP wire.
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