Land Rover Freelander 2002my Electrical Library 3rd Edition Rover Manual

DESCRIPTION AND OPERATION
4.70FREELANDER 02MY
Torque Converter Lock-Up
When the gearbox is in 4th or 5th gear, and the ATCU registers a high vehicle speed 
combined with a small throttle angle, the ATCU will lock the torque converter. This will 
enable maximum power to be transmitted to the road wheels. When this occurs, the ATCU 
(C0932) provides a PWM signal to the Lock-Up solenoid (C0243) on a U wire. The solenoid 
(C0243) is earthed via the ATCU (C0932) on an SB wire. For more details on torque...

DESCRIPTION AND OPERATION
FREELANDER 02MY 4.71
ANTI-LOCK BRAKING SYSTEM (ABS) – 01MY
DESCRIPTION
General
The ABS is a full time, four channel system that gives individual speed control to all four 
wheels to provide the vehicle with anti-lock braking (ABS), Electronic Traction Control 
(ETC), and Hill Descent Control (HDC). The systems are controlled by the ABS ECU, which 
is mounted on the rear of the ABS modulator. The ABS ECU also controls the front to rear 
brake balance by Electronic Braking force...

DESCRIPTION AND OPERATION
4.72FREELANDER 02MY
OPERATION
General
Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, 
fusible link 8, and fusible 11 (C0632) on an R wire. All are located in the engine compartment 
fuse box.
Fusible link 8 (C0574) and fusible link 11 (C0570) provide constant battery feeds to the ABS 
modulator (C0500) on NK and NR wires respectively. The ABS modulator (C0500) is 
earthed on a pair of B wires.
Fusible link 1 is connected in series...

DESCRIPTION AND OPERATION
FREELANDER 02MY 4.73
ABS ECU
Td4 (Manual Transmission)
The ABS ECU (C0500) provides a road wheel speed signal to the Engine Control Module 
(ECM) (C0331) via the CAN BUS on YN (low) and YB (high) wires.
Td4 (Automatic Transmission)
The ABS ECU (C0500) provides a road wheel speed signal to the Automatic Transmission 
Control Unit (ATCU) (C0932) via the CAN BUS on YN (low) and YB (high) wires.
K1.8
The ABS ECU (C0500) provides a road wheel speed signal to the Engine Control Module...

DESCRIPTION AND OPERATION
4.74FREELANDER 02MY
Brake Pedal Switch
The brake pedal switch is a double contact mechanical switch, mounted at the top of the 
brake pedal adjacent the brake pedal sensor. The switch (C0075) is provided an ignition 
feed from fuse 2 of the passenger compartment fuse box (C0580) on a G wire. When the 
brake pedal is at rest, the switch (C0075) provides a feed to the ABS ECU (C0500) on a GR 
wire. When the brake pedal is pressed, the switch (C0075) informs the ABS ECU (C0500) 
by...

DESCRIPTION AND OPERATION
FREELANDER 02MY 4.75
Hill Descent Control (HDC)
HDC Relay
The HDC relay (C0575) is located in the engine compartment fuse box, and is provided a 
feed by the ABS ECU (C0500) on a BR wire. Operation of the HDC relay is controlled by the 
ABS ECU via the HDC switch (C0365 on manual vehicles, C0878 on automatic vehicles) on 
a W wire (see below).
When energised, the HDC relay (C0570) provides a feed to the following on GP wires:

The ABS ECU (C0500).

The LH brake lamp (C0121)....

DESCRIPTION AND OPERATION
4.76FREELANDER 02MY
ANTI-LOCK BRAKING SYSTEM (ABS) – 02MY
DESCRIPTION
General
The ABS is a full time, four channel system that gives individual speed control to all four 
wheels to provide the vehicle with anti-lock braking (ABS), Electronic Traction Control 
(ETC), and Hill Descent Control (HDC). The systems are controlled by the ABS ECU, which 
is mounted on the rear of the ABS modulator. The ABS ECU also controls the front to rear 
brake balance by Electronic Braking force...

DESCRIPTION AND OPERATION
FREELANDER 02MY 4.77
Wheel Speed Sensors
The ABS ECU (C0501) supplies a feed to all four wheel speed sensors as follows:

To the LH front wheel speed sensor (C0516) on an R wire.

To the RH front wheel speed sensor (C0517) on a Y wire.

To the LH rear wheel speed sensor (C0502) on a G wire.

To the RH rear wheel speed sensor (C0503) on a W wire.
The wheel speed sensors provide the ABS ECU with a square wave form signal. By 
measuring the frequency of the wave form, the ABS ECU...

DESCRIPTION AND OPERATION
4.78FREELANDER 02MY
KV6 – ROW
The ABS ECU (C0500 on 01MY vehicles, C0501 on 02MY vehicles) provides a road wheel 
speed signal to the ATCU (C0932) via the CAN BUS on YN (low) and YB (high) wires. This 
information is relayed to the ECM (C0371) via the CAN BUS on YN (low) and YB (high) 
wires.
For more information on the CAN BUS, refer to the  Communication Databuses  section 
of the System Description and Operation Workshop manual.
Brake Pedal Switch
The brake pedal switch is a...

DESCRIPTION AND OPERATION
FREELANDER 02MY 4.79
Hill Descent Control (HDC)
HDC Switch (Manual Transmission)
The HDC switch (C0365) is mounted on the gear lever, and informs the ABS ECU (C0501) 
when HDC has been selected. When HDC is selected, the switch contacts close, and a feed 
is provided to the ABS ECU (C0501) on a PS wire. When the ABS ECU receives this feed, 
it energises the HDC relay.
HDC Switch (Automatic Transmission)
The HDC switch (C0878) is mounted on the centre console, and informs the ABS...