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

							DESCRIPTION AND OPERATION
4.60FREELANDER 02MY
Reverse
When reverse gear is selected, a main relay feed is able to flow from the transmission 
selector/inhibit switch (C0244) to  the reverse lamp relay (C0935) on an NG wire. The 
reverse lamp relay (C0935) is earthed on a B wire and controls operation of the reverse 
lamps. For more information on reverse lamp operation, refer to the  Brake and Reverse 
Lamps  section of this manual.
 
+  BRAKE AND REVERSE LAMPS. 
A main relay feed is also supplied to the ATCU (C0932) and the selector indicator (C0675) 
on NG wires. The R symbol on the selector housing will now illuminate.
If the vehicle is travelling forwards at greater than 6 mph (10 kph), the ATCU (C0932) 
provides a feed to the Low Coast solenoid (C0243) on a K wire. The Low Coast solenoid 
(C0243) is earthed via the ATCU (C0932) on an SB wire. When the Low Coast solenoid 
receives this feed, it drains the transmission fluid from the reverse clutch, thus preventing 
reverse gear from being selected.
Neutral
When neutral is selected, a main relay feed is able to flow from the transmission selector/
inhibit switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a WU 
wire. The N symbol on the selector housing will now illuminate.
Drive
When drive is selected, a main relay feed is able to flow from the transmission selector/
inhibit switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a WB wire. 
The D symbol on the selector housing will now illuminate.
When drive is selected, the ATCU (C0932) receives signals from the vehicle speed sensor 
(C0243) housed within the gearbox on a U wire. The sensor (C0243) is earthed via ATCU 
(C0932) on a W then KB wire. The ATCU (C0932) also receives a throttle pedal signal from 
the ECM (C0331 on Td4 vehicles, C0371 on KV6 vehicles) via the CAN-BUS on YN (Low) 
and YB (High) wires. The ATCU uses this information to select the appropriate gear by 
operating the gearbox shift solenoids as follows:
1st Gear
To select first gear, shift solenoid B and shift solenoid C are operated. The ATCU (C0932) 
will provide a feed to shift solenoid B (C0243) on an O wire. Shift solenoid C (C0243) 
receives a feed from the ATCU (C0932) on an OU wire.
2nd Gear
To select second gear, shift solenoid A and shift solenoid B are operated. The ATCU 
(C0932) will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid B 
(C0243) receives a feed from the ATCU (C0932) on an O wire.
3rd Gear
To select third gear, only shift solenoid B is operated. The ATCU (C0932) will provide a feed 
to shift solenoid B (C0243) on an O wire. 
						

							DESCRIPTION AND OPERATION
FREELANDER 02MY 4.61
4th Gear
To select fourth gear, only shift solenoid C is operated. The ATCU (C0932) will provide a 
feed to shift solenoid C (C0243) on an OU wire.
5th Gear
To select fifth gear, shift solenoid A and shift solenoid C are operated. The ATCU (C0932) 
will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid C (C0243) 
receives a feed from the ATCU (C0932) on an OU wire.
4
When 4 is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on an RG wire. The 
4 symbol on the selector housing will now illuminate.
When 4 is selected, only the lowest 4 gears will be operable. For more information, refer to 
the  Drive  section.
2
When 2 is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on an OB wire. The 
2 symbol on the selector housing will now illuminate.
When 2 is selected, only the lowest 2 gears will be operable. For more information, refer to 
the  Drive  section.
1
When 1 is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a GY wire. The 
1 symbol on the selector housing will now illuminate.
When 1 is selected, only first gear will be operable. For more information, refer to the  Drive  
section.
Mode Selection
Sport Mode
The selector lever (C0410) is provided a main relay feed via fuse 4 of the engine 
compartment fuse box (C0575) on an NK wire. When the lever is moved across to the S/M 
position, the selector lever (C0410) provides a feed to the ATCU (C0932) on an LGK wire. 
The ATCU will now enter sport mode. In sport mode, the gearbox still operates as a 
conventional automatic transmission, but the unit becomes more responsive to driver 
demands. The selector lever (C0410) is earthed on a B wire.
The selector lever (C0410) also provides a feed to the selector indicator (C0675) on an LGK 
wire, illuminating the S/M symbol on the selector housing. 
						

							DESCRIPTION AND OPERATION
4.62FREELANDER 02MY
Manual (Steptronic) Mode
When in sport mode, if the selector lever is moved to the + or - positions, the gearbox will 
automatically enter manual (Steptronic) mode. When the selector lever is moved to the - 
position, it provides a feed to the ATCU (C0932) on a GK wire. When the selector lever is 
moved to the + position, it provides a feed to the ATCU (C0932) on a GB wire. Manual gear 
changes can now be performed sequentially using the selector lever.
Cruise Control Mode – Td4
The cruise control master switch is located on the centre console, below the radio. When 
cruise control is activated, the cruise control interface unit (C1959) provides a feed to the 
ATCU (C0932) on a WU wire. In cruise control mode, the ATCU uses a dedicated gearshift 
map to control the gearbox and assist the cruise control ECU in maintaining the vehicle 
speed at the required level.
For more information on cruise control operation, refer to the  Cruise Control – Td4 (01MY)  
section of this manual.
 
+  CRUISE CONTROL – Td4 (01MY). 
Cruise Control Mode – KV6
The cruise control master switch is located on the centre console, below the radio. When 
cruise control is activated, the cruise control ECU (C0239) provides a feed to the ATCU 
(C0932) on a WU wire. In cruise control mode, the ATCU uses a dedicated gearshift map to 
control the gearbox and assist the cruise control ECU in maintaining the vehicle speed at 
the required level.
For more information on cruise control operation, refer to the  Cruise Control – KV6  section 
of this manual.
 
+  CRUISE CONTROL – KV6. 
Hill Descent Control (HDC) Mode
In HDC mode, the ATCU applies engine braking to assist the ABS ECU in controlling the 
vehicles descent. HDC mode is activated if all of the following conditions exist:

The gear selector lever is in position 1 or R.

The HDC switch is depressed.

The throttle pedal is released.
The ATCU (C0932) communicates with the ABS ECU (C0500) via the CAN-BUS on YB 
(High) and YN (Low) wires. For more information on the CAN-BUS, refer to the  
Communication Databuses  section of the System Description and Operation Workshop 
manual.
Fluid Pressure Control
Fluid pressure within the automatic gearbox is controlled by the Line Pressure solenoid. 
When required, the ATCU (C0932) provides a Pulse Width Modulated (PWM) signal to the 
Line Pressure solenoid (C0243) on a Y wire. The solenoid (C0243) is earthed via the ATCU 
(C0932) on an SB wire. For more details on fluid pressure control, refer to the  Automatic 
Gearbox – Jatco  section of the System Description and Operation Workshop manual. 
						

							DESCRIPTION AND OPERATION
FREELANDER 02MY 4.63
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 
converter lock-up, refer to the  Automatic Gearbox – Jatco  section of the Workshop 
manual.
Diagnostic Socket
If the ATCU detects a failure in an associated component, a fault code will be stored in its 
memory. TestBook or T4 can be used via the diagnostic socket to retrieve these fault codes 
to identify the cause of the failure. The diagnostic socket (C0040) is connected to the ATCU 
(C0932) by a K wire. 
						

							DESCRIPTION AND OPERATION
4.64FREELANDER 02MY
ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – 02MY
DESCRIPTION
General
The Jatco 5–speed automatic transmission fitted to Freelander is controlled by an Automatic 
Transmission Control Unit (ATCU). The ATCU is located inside the engine E-box, and 
receives information from the following sources to calculate when to operate the solenoid 
valves contained within the gearbox to enable quick, smooth, quiet gear changes;

The Engine Control Module (ECM) via the CAN-BUS,

The instrument pack via the CAN-BUS,

The cruise control ECU,

The automatic transmission selector,

The brake pedal switch,

The automatic gearbox sensors.
The Jatco automatic gearbox also has a number of different operating modes. When the 
ignition switch is first turned to the ignition position, the gearbox will always revert to the 
Normal mode. For a full description of the 5–speed automatic transmission, refer to the  
Automatic Gearbox – Jatco section of the System Description and Operation Workshop 
manual. 
						

							DESCRIPTION AND OPERATION
FREELANDER 02MY 4.65
OPERATION
General
Feed from the positive battery terminal (C0192) is supplied to the main relay and fusible link 
3 (C0632) on an R wire. Both are located in the engine compartment fuse box.
The battery also provides a feed to fusible link 4 of the engine compartment fuse box 
(C0632) on vehicles fitted with an instrument dimmer switch. For more information, refer to 
the  Interior Lamps  section of this manual.
 
+  INTERIOR LAMPS. 
Operation of the main relay (C0576 on Td4 vehicles, C0578 on KV6 vehicles) is controlled 
by the Engine Control Module (ECM) (C0603 on Td4 vehicles, C0604 on KV6 NAS vehicles, 
C0371 on KV6 ROW vehicles) on a WK wire (NG on KV6 NAS vehicles). The energised 
main relay allows a battery feed to flow to fuse 4 of the engine compartment fuse box. Fuse 
4 (C0575) provides a feed to the following on NK wires:

The Automatic Transmission Control Unit (ATCU) (C0932).

The transmission selector (C0244) (vehicles without instrument dimmer only).

The illumination relay (C1976) (vehicles with instrument dimmer only).

The Steptronic switches (C0410).
For further details of main relay operation, refer to the Engine Management – EDC ,  
Engine Management – Siemens (NAS)  or  Engine Management – Siemens (All Except 
NAS)  section of the System Description and Operation Workshop manual.
Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the 
ignition switch is turned to the ignition position, current flows across the switch (C0028) to 
fuse 35 of the passenger compartment fuse box (C0588) on a G wire. Fuse 35 (C0580) 
provides an ignition feed to the transmission inhibit switch (C0244) on a W wire. 
						

							DESCRIPTION AND OPERATION
4.66FREELANDER 02MY
ATCU
The ATCU monitors the operation of the automatic gearbox via four sensors:

The temperature of the automatic transmission fluid (ATF) is measured by the fluid 
temperature sensor. The fluid temperature sensor (C0243) receives a feed from the 
ATCU (C0932) on a WK wire. The temperature sensor return (C0243) to the ATCU 
(C0932) is via a KB wire. As the temperature of the ATF rises, so the resistance of the 
sensor decreases. The ATCU registers this drop in resistance and calculates the 
temperature of the ATF accordingly. For more information on the fluid temperature 
sensor, refer to the  Automatic Gearbox – Jatco  section of the System Description 
and Operation Workshop manual.

Vehicle speed is measured by the vehicle speed sensor. The vehicle speed sensor 
(C0243) is connected to the ATCU (C0932) by a U wire. The speed sensor creates a 
sinusoidal waveform, with each positive phase of the waveform representing one tooth 
on the parking gear (19 per engine revolution). The ATCU uses this waveform to 
calculate vehicle speed. The sensor return (C0243) to the ATCU (C0932) is via a W 
then KB wire. For more information on the vehicle speed sensor, refer to the  
Automatic Gearbox – Jatco  section of the System Description and Operation 
Workshop manual.

Input shaft speed into the gearbox is measured by the turbine sensor. The turbine 
sensor (C0243) is connected to the ATCU (C0932) by an R wire. The turbine sensor 
creates a sinusoidal waveform, with 16 positive phases representing one input shaft 
revolution. The ATCU uses this signal along with a vehicle speed signal to calculate if 
the correct gear has been selected. The sensor return (C0243) to the ATCU (C0932) 
is via a U then KB wire. For more information on the turbine sensor, refer to the  
Automatic Gearbox – Jatco  section of the System Description and Operation 
Workshop manual.

The internal, or intermediate, transmission speed is measured by the intermediate 
sensor. The intermediate sensor (C0243) is connected to the ATCU (C0932) by an R 
wire. The intermediate sensor creates a sinusoidal waveform, with each positive phase 
of the waveform representing one tooth of the output gear (49 per revolution). The 
ATCU uses this signal to ensure the correct gear is engaged, and to monitor the 
amount of slip within the gearbox. The sensor return (C0243) to the ATCU (C0932) is 
via a B then KB wire. For more information on the intermediate sensor, refer to the  
Automatic Gearbox – Jatco  section of the System Description and Operation 
Workshop manual.
Park
When park is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a KO wire. The 
P symbol on the selector housing will now illuminate.
NOTE: On Canadian specification vehicles, a feed is also provided to the Central Control 
Unit (CCU) (C0593) on a KO wire. This input is used by the CCU to extinguish the daylight 
running lamps. 
						

							DESCRIPTION AND OPERATION
FREELANDER 02MY 4.67
Reverse
When reverse gear is selected, a main relay feed is able to flow from the transmission 
selector/inhibit switch (C0244) to  the reverse lamp relay (C0935) on an NG wire. The 
reverse lamp relay (C0935) is earthed on a B wire and controls operation of the reverse 
lamps. For more information on reverse lamp operation, refer to the  Brake and Reverse 
Lamps  section of this manual.
 
+  BRAKE AND REVERSE LAMPS. 
A main relay feed is also supplied to the ATCU (C0932) and the selector indicator (C0675) 
on NG wires. The R symbol on the selector housing will now illuminate.
If the vehicle is travelling forwards at greater than 6 mph (10 kph), the ATCU (C0932) 
provides a feed to the Low Coast solenoid (C0243) on a K wire. The Low Coast solenoid 
(C0243) is earthed via the ATCU (C0932) on an SB wire. When the Low Coast solenoid 
receives this feed, it drains the transmission fluid from the reverse clutch, thus preventing 
reverse gear from being selected.
Neutral
When neutral is selected, a main relay feed is able to flow from the transmission selector/
inhibit switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a WU 
wire. The N symbol on the selector housing will now illuminate.
Drive
When drive is selected, a main relay feed is able to flow from the transmission selector/
inhibit switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a WB wire. 
The D symbol on the selector housing will now illuminate.
When drive is selected, the ATCU (C0932) receives signals from the vehicle speed sensor 
(C0243) housed within the gearbox on a U wire. The sensor (C0243) is earthed via ATCU 
(C0932) on a W then KB wire. The ATCU (C0932) also receives a throttle pedal signal from 
the ECM (C0331 on Td4 and KV6 NAS vehicles, C0371 on KV6 ROW vehicles) via the CAN-
BUS on YN (Low) and YB (High) wires. The ATCU uses this information to select the 
appropriate gear by operating the gearbox shift solenoids as follows:
1st Gear
To select first gear, shift solenoid B and shift solenoid C are operated. The ATCU (C0932) 
will provide a feed to shift solenoid B (C0243) on an O wire. Shift solenoid C (C0243) 
receives a feed from the ATCU (C0932) on an OU wire.
2nd Gear
To select second gear, shift solenoid A and shift solenoid B are operated. The ATCU 
(C0932) will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid B 
(C0243) receives a feed from the ATCU (C0932) on an O wire.
3rd Gear
To select third gear, only shift solenoid B is operated. The ATCU (C0932) will provide a feed 
to shift solenoid B (C0243) on an O wire. 
						

							DESCRIPTION AND OPERATION
4.68FREELANDER 02MY
4th Gear
To select fourth gear, only shift solenoid C is operated. The ATCU (C0932) will provide a 
feed to shift solenoid C (C0243) on an OU wire.
5th Gear
To select fifth gear, shift solenoid A and shift solenoid C are operated. The ATCU (C0932) 
will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid C (C0243) 
receives a feed from the ATCU (C0932) on an OU wire.
4
When 4 is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on an RG wire. The 
4 symbol on the selector housing will now illuminate.
When 4 is selected, only the lowest 4 gears will be operable. For more information, refer to 
the  Drive  section.
2
When 2 is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on an OB wire. The 
2 symbol on the selector housing will now illuminate.
When 2 is selected, only the lowest 2 gears will be operable. For more information, refer to 
the  Drive  section.
1
When 1 is selected, a main relay feed is able to flow from the transmission selector/inhibit 
switch (C0244) to the ATCU (C0932) and the selector indicator (C0675) on a GY wire. The 
1 symbol on the selector housing will now illuminate.
When 1 is selected, only first gear will be operable. For more information, refer to the  Drive  
section.
Mode Selection
Sport Mode
The selector lever (C0410) is provided a main relay feed via fuse 4 of the engine 
compartment fuse box (C0575) on an NK wire. When the lever is moved across to the S/M 
position, the selector lever (C0410) provides a feed to the ATCU (C0932) on an LGK wire. 
The ATCU will now enter sport mode. In sport mode, the gearbox still operates as a 
conventional automatic transmission, but the unit becomes more responsive to driver 
demands. The selector lever (C0410) is earthed on a B wire.
The selector lever (C0410) also provides a feed to the selector indicator (C0675) on an LGK 
wire, illuminating the S/M symbol on the selector housing. 
						

							DESCRIPTION AND OPERATION
FREELANDER 02MY 4.69
Manual (Steptronic) Mode
When in sport mode, if the selector lever is moved to the + or - positions, the gearbox will 
automatically enter manual (Steptronic) mode. When the selector lever is moved to the - 
position, it provides a feed to the ATCU (C0932) on a GK wire. When the selector lever is 
moved to the + position, it provides a feed to the ATCU (C0932) on a GB wire. Manual gear 
changes can now be performed sequentially using the selector lever.
Cruise Control Mode – Td4
The cruise control master switch is located on the centre console, below the radio. When 
cruise control is activated, the cruise control interface unit (C1959) provides a feed to the 
ATCU (C0932) on a WU wire. In cruise control mode, the ATCU uses a dedicated gearshift 
map to control the gearbox and assist the cruise control ECU in maintaining the vehicle 
speed at the required level.
For more information on cruise control operation, refer to the  Cruise Control – Td4 (02MY) 
& KV6 (North America)  section of this manual.
 
+  CRUISE CONTROL – TD4 (02MY) & KV6 (NORTH AMERICA). 
Cruise Control Mode – KV6
The cruise control master switch is located on the centre console, below the radio. When 
cruise control is activated, the cruise control ECU (C0239) provides a feed to the ATCU 
(C0932) on a WU wire. In cruise control mode, the ATCU uses a dedicated gearshift map to 
control the gearbox and assist the cruise control ECU in maintaining the vehicle speed at 
the required level.
For more information on cruise control operation, refer to the  Cruise Control – KV6  section 
of this manual.
 
+  CRUISE CONTROL – KV6. 
Hill Descent Control (HDC) Mode
In HDC mode, the ATCU applies engine braking to assist the ABS ECU in controlling the 
vehicles descent. HDC mode is activated if all of the following conditions exist:

The gear selector lever is in position 1 or R.

The HDC switch is depressed.

The throttle pedal is released.
The ATCU (C0932) communicates with the ABS ECU (C0501) via the CAN-BUS on YB 
(High) and YN (Low) wires. For more information on the CAN-BUS, refer to the  
Communication Databuses  section of the System Description and Operation Workshop 
manual.
Fluid Pressure Control
Fluid pressure within the automatic gearbox is controlled by the Line Pressure solenoid. 
When required, the ATCU (C0932) provides a Pulse Width Modulated (PWM) signal to the 
Line Pressure solenoid (C0243) on a Y wire. The solenoid (C0243) is earthed via the ATCU 
(C0932) on an SB wire. For more details on fluid pressure control, refer to the   Automatic 
Gearbox – Jatco   section of the System Description and Operation Workshop manual.