Land Rover Freelander 2003my Electrical Library Rover Manual
Have a look at the manual Land Rover Freelander 2003my Electrical Library Rover Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 364 Land Rover manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
DESCRIPTION AND OPERATION 4.56FREELANDER 03MY Engine Control Module (ECM) The ECM (C0371) provides a feed to the interface unit (C1959) on a BU wire if the following conditions exist: zHDC is not activated. zThe gear selector lever is not in the park, neutral, or reverse positions. zEngine speed is below 6,496 rpm. For more information on the Siemens ECM, refer to the Engine Management Systems – Siemens section of the System Description and Operation Workshop manual. Cruise Control Pump When all conditions for cruise control activation have been met, the cruise control ECU (C0239) provides a feed to the cruise control pump motor (C0228) on a WU wire. The pump motor creates a vacuum in the pump actuator. For a detailed description of actuator operation, refer to the Engine Management Systems – Siemens section of the Workshop manual. Current flow across the pump motor is controlled by the ECU (C0239) providing a varying Pulse Width Modulated (PWM) signal to the other side of the pump motor (C0228) on a BR wire. When the correct vehicle speed has been reached, the ECU (C0239) replaces the PWM feed with a continuous feed. As the potential difference across the pump motor is now 0V, the pump motor stops operating. To maintain the vacuum in the actuator, both the control and dump valves are closed by the ECU. To close the valves, the ECU (C0239) provides a feed to the control and dump valves (C0228) on a WU wire. Current flows across the control valve (C0228) to the ECU (C0239) on a PY wire. Current flows across the dump valve (C0228) to the ECU (C0239) on a BR wire. NOTE: Both the control valve and the dump valve are normally open valves. When a decrease in speed is requested, the control valve is opened to reduce the depression within the actuator. This is done by the ECU (C0239) providing a PWM signal to the control valve (C0228) on a PY wire. When the correct speed has been achieved, the PWM signal is withdrawn. When cruise is cancelled, the ECU (C0239) withdraws the feed to the dump valve (C0228) on a WU wire. The dump valve now opens, allowing atmospheric pressure into the actuator.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.57 Brake Pedal Switch As a safety feature, the dump valve is opened if the brake pedal is depressed. If cruise control is active and the brake pedal is pressed, the brake pedal switch (C0075) provides a feed to the dump valve (C0228) on a GP wire. As the potential difference across the valve is 0V, the valve opens allowing atmospheric pressure into the actuator. Electronic Automatic Transmission (EAT) ECU When all conditions for cruise control activation have been met, the cruise control ECU (C0239) provides a feed to the EAT ECU (C0932) on a WU wire. When the EAT ECU receives this feed, it enters its cruise control mode. For more information on EAT operation refer to the Electronic Automatic Transmission (EAT) section of this manual. + ELECTRONIC AUTOMATIC TRANSMISSION (EAT). Instrument Pack When all conditions for cruise control activation have been met, the cruise control ECU (C0239) provides a feed to the cruise control LED mounted within the instrument pack (C0230) on a WU wire. The cruise control LED is provided an earth by the instrument pack (C0230) on a B wire. Diagnostic Socket The diagnostic socket (C0040) is connected to the cruise control ECU (C0239) by a K wire, enabling the ECU to be interrogated by TestBook or T4.
DESCRIPTION AND OPERATION 4.58FREELANDER 03MY ELECTRONIC AUTOMATIC TRANSMISSION (EAT) DESCRIPTION General The Jatco 5–speed automatic transmission fitted to Freelander is controlled by an Electronic Automatic Transmission Electronic Control Unit (EAT ECU). The EAT ECU 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; zThe Engine Control Module (ECM) via the CAN-BUS, zThe instrument pack via the CAN-BUS, zThe cruise control ECU, zThe automatic transmission selector, zThe brake pedal switch, zThe 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. 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.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.59 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: zThe Electronic Automatic Transmission Electronic Control Unit (EAT ECU) (C0932) on a NK wire. zThe transmission selector (C0244) (vehicles without instrument dimmer only) on a NK then a NR wire. zThe illumination relay (C1976) (vehicles with instrument dimmer only) on a NK then a NR wire. zThe CommandShift switch (C0410) on a NK wire. 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 4.60FREELANDER 03MY EAT ECU The EAT ECU monitors the operation of the automatic gearbox via four sensors: zThe temperature of the automatic transmission fluid (ATF) is measured by the fluid temperature sensor. The fluid temperature sensor (C0243) receives a feed from the EAT ECU (C0932) on a WK wire. The temperature sensor return (C0243) to the EAT ECU (C0932) is via a KB wire. As the temperature of the ATF rises, so the resistance of the sensor decreases. The EAT ECU 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. zVehicle speed is measured by the vehicle speed sensor. The vehicle speed sensor (C0243) is connected to the EAT ECU (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 EAT ECU uses this waveform to calculate vehicle speed. The sensor return (C0243) to the EAT ECU (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. zInput shaft speed into the gearbox is measured by the turbine sensor. The turbine sensor (C0243) is connected to the EAT ECU (C0932) by an R wire. The turbine sensor creates a sinusoidal waveform, with 16 positive phases representing one input shaft revolution. The EAT ECU uses this signal along with a vehicle speed signal to calculate if the correct gear has been selected. The sensor return (C0243) to the EAT ECU (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. zThe internal, or intermediate, transmission speed is measured by the intermediate sensor. The intermediate sensor (C0243) is connected to the EAT ECU (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 EAT ECU 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 EAT ECU (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.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.61 Park When park is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the EAT ECU (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. 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 EAT ECU (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 EAT ECU (C0932) provides a feed to the Low Coast solenoid (C0243) on a K wire. The Low Coast solenoid (C0243) is earthed via the EAT ECU (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 EAT ECU (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 EAT ECU (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 EAT ECU (C0932) receives signals from the vehicle speed sensor (C0243) housed within the gearbox on a U wire. The sensor (C0243) is earthed via EAT ECU (C0932) on a W then KB wire. The EAT ECU (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 EAT ECU uses this information to select the appropriate gear by operating the gearbox shift solenoids as follows:
DESCRIPTION AND OPERATION 4.62FREELANDER 03MY 1st Gear To select first gear, shift solenoid B and shift solenoid C are operated. The EAT ECU (C0932) will provide a feed to shift solenoid B (C0243) on an O wire. Shift solenoid C (C0243) receives a feed from the EAT ECU (C0932) on an OU wire. 2nd Gear To select second gear, shift solenoid A and shift solenoid B are operated. The EAT ECU (C0932) will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid B (C0243) receives a feed from the EAT ECU (C0932) on an O wire. 3rd Gear To select third gear, only shift solenoid B is operated. The EAT ECU (C0932) will provide a feed to shift solenoid B (C0243) on an O wire. 4th Gear To select fourth gear, only shift solenoid C is operated. The EAT ECU (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 EAT ECU (C0932) will provide a feed to shift solenoid A (C0243) on an R wire. Shift solenoid C (C0243) receives a feed from the EAT ECU (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 EAT ECU (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 EAT ECU (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.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.63 1 When 1 is selected, a main relay feed is able to flow from the transmission selector/inhibit switch (C0244) to the EAT ECU (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 EAT ECU (C0932) on an LGK wire. The EAT ECU 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. Manual (CommandShift) Mode When in sport mode, if the selector lever is moved to the + or - positions, the gearbox will automatically enter manual (CommandShift) mode. When the selector lever is moved to the - position, it provides a feed to the EAT ECU (C0932) on a GK wire. When the selector lever is moved to the + position, it provides a feed to the EAT ECU (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 EAT ECU (C0932) on a WU wire. In cruise control mode, the EAT ECU 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 & KV6 (North America) section of this manual. + CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA).
DESCRIPTION AND OPERATION 4.64FREELANDER 03MY 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 EAT ECU (C0932) on a WU wire. In cruise control mode, the EAT ECU 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 EAT ECU applies engine braking to assist the ABS ECU in controlling the vehicles descent. HDC mode is activated if all of the following conditions exist: zThe gear selector lever is in position 1 or R. zThe HDC switch is depressed. zThe throttle pedal is released. The EAT ECU (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 duty solenoid. When required, the EAT ECU (C0932) provides a Pulse Width Modulated (PWM) signal to the Line Pressure duty solenoid (C0243) on a Y wire. The solenoid (C0243) is earthed via the EAT ECU (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. Torque Converter Lock-Up When the gearbox is in 4th or 5th gear, and the EAT ECU registers a high vehicle speed combined with a small throttle angle, the EAT ECU will lock the torque converter. This will enable maximum power to be transmitted to the road wheels. When this occurs, the EAT ECU (C0932) provides a PWM signal to the Lock-Up duty solenoid (C0243) on a U wire. The solenoid (C0243) is earthed via the EAT ECU (C0932) on an SB wire. For more details on torque converter lock-up, refer to the Automatic Gearbox – Jatco section of the System Description and Operation Workshop manual.
DESCRIPTION AND OPERATION FREELANDER 03MY 4.65 Shift Interlock When the ignition switch is in the ignition position and the selector lever is in the Park, the EAT ECU (C0932) provides a feed to the shift interlock solenoid (C0268) on a GW wire locking the selector lever in the Park position. When the brake pedal is pressed, the brake pedal switch (C0652) provides a feed to the EAT ECU (C0932) on a GR wire. Sensing the brake pedal has been pressed the EAT ECU withdraws the feed to the shift interlock solenoid, releasing the selector lever. The shift interlock solenoid (C0268) is earthed on a B wire. Diagnostic Socket If the EAT ECU 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 EAT ECU (C0932) by a K wire.