Land Rover Freelander 2004my Electrical Library Rover Manual
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DESCRIPTION AND OPERATION 4.42FREELANDER 04MY CHARGING AND STARTING – KV6 DESCRIPTION Starting The starting system on the vehicle comprises a 12 volt starter motor which drives the engine to start the combustion process. The starter converts electrical energy into mechanical power. The vehicle electrical system must be capable of supplying sufficient power to enable the engine to be cranked. Charging The charging system comprises a battery and an alternator. The battery must be of a sufficient capacity to operate the starter motor and operate various electrical systems in the vehicle. The alternator charges the battery when the engine is running and increases its output as demand on the battery increases. The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – Siemens (All Except NAS) section of the System Description and Operation Workshop manual. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fuse 10, and the main relay (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also provides a feed to the starter motor solenoid (C0178) on an R wire. Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box. 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 18, fuse 22, and fuse 41 of the passenger compartment fuse box (C0588) on a G wire. When the ignition switch is turned to the crank position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.43 Starting Main Relay Fuse 22 of the passenger compartment fuse box (C0580) provides an ignition feed to the Engine Control Module (ECM) (C0371) on a W wire. When the ECM receives this feed, it energises the main relay by providing an earth path for the relay coil (C0578) on a WK wire. The energised main relay is now able to provide a feed to the fuel pump relay. The fuel pump relay is also located in the engine compartment fuse box. Inertia Switch Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasnt been tripped, current flows across the switch (C0123) to the fuel pump relay (C0575) on a GU wire. The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a UG wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). Fuel Pump Relay The fuel pump relay coil receives a feed from the energised main relay (see above). The earth path for the relay coil (C0575) is controlled by the ECM (C0371) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 22 of the passenger compartment fuse box (C0580) on a W wire. The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0114) on a WP wire. The fuel pump (C0114) is earthed on a B wire. Starter Relay Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch crank feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on a RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0179) on an NR wire. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual. + ENGINE IMMOBILISATION.
DESCRIPTION AND OPERATION 4.44FREELANDER 04MY Starter Motor and Starter Motor Solenoid The starter motor solenoid coil (C0179) receives a feed from the energised starter relay (C0572) on an NR wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor. Central Control Unit (CCU) The CCU (C0428) receives a feed from the inertia switch (C0123) via the engine compartment fuse box (C0576) on a UG wire. If this feed is removed due to the inertia switch being tripped, the CCU will unlock all of the doors. For more details of the Central Door Locking (CDL) system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). NOTE: The CCU will only unlock all doors if the ignition switch is in the ignition position. The CCU (C0429) also provides a signal feed to the immobilisation ECU (C0059) on a KN wire. This signal feed informs the immobilisation ECU to energise the starter relay. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual. + ENGINE IMMOBILISATION. Charging Alternator Fusible link 1 of the engine compartment fuse box (C0826) provides a constant battery feed to the alternator (C0183) on an R wire. Fuse 41 of the passenger compartment fuse box (C0583) provides an ignition feed to the alternator (C0053) on a W wire. When the engine is turned over, the alternator (C0053) supplies the ECM (C0371) with a Pulse Width Modulated (PWM) signal on a GK wire. The ECM uses this PWM signal to calculate the electrical load on the alternator, and controls engine idle speed accordingly. When the engine is started, the magnetised rotor within the stator windings generate 3 phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field diodes in the rectifier pack convert the ac current into direct current (dc). Output current from the field diodes supplements the initial current flowing through the field windings. This causes an increase in the magnetic influence of the rotor, resulting in self-exitation of the alternator. The field current increases with rotor speed and thus increases the generated current and voltage until the alternator is fully excited. The alternator (C0183) charges the battery by providing current via fusible link 1 of the engine compartment fuse box (C0826 & C0632) to the battery positive terminal (C0192) on an R wire.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.45 Ignition/No Charge Warning Lamp Fuse 18 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Current flows across the lamp (C0233) and is provided an earth path by the alternator (C0053) on an NY wire. The warning lamp will now illuminate. When the alternator is charging, it provides a feed to the warning lamp (C0233) on the NY wire. Because the potential difference across the bulb is 0 V, the lamp will now extinguish.
DESCRIPTION AND OPERATION 4.46FREELANDER 04MY CHARGING AND STARTING – KV6 (NORTH AMERICA) DESCRIPTION Starting The starting system on the vehicle comprises a 12 volt starter motor which drives the engine to start the combustion process. The starter converts electrical energy into mechanical power. The vehicle electrical system must be capable of supplying sufficient power to enable the engine to be cranked. Charging The charging system comprises a battery and an alternator. The battery must be of a sufficient capacity to operate the starter motor and operate various electrical systems in the vehicle. The alternator charges the battery when the engine is running and increases its output as demand on the battery increases. The instrument pack incorporates a charge warning lamp which illuminates when there is no output or a low output from the alternator. For a detailed description of the charging and starting system, refer to the Engine Management Systems – Siemens (NAS) section of the System Description and Operation Workshop manual. OPERATION General Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fuse 10, and the main relay (C0632) on an R wire. All are located in the engine compartment fuse box. The battery (C0192) also provides a feed to the starter motor solenoid (C0178) on an R wire. Fusible link 1 is connected in series with fusible link 7, which is also located in the engine compartment fuse box. 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 18, fuse 22, and fuse 41 of the passenger compartment fuse box (C0588) on a G wire. When the ignition switch is turned to the crank position, current flows across the switch (C0028) to fuse 5 of the passenger compartment fuse box (C0588) on a WR wire.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.47 Starting Main Relay Fuse 22 of the passenger compartment fuse box (C0580) provides an ignition feed to the Engine Control Module (ECM) (C0603) on a W wire. When the ECM receives this feed, it energises the main relay by providing an earth path for the relay coil (C0578) on an NG wire. The energised main relay is now able to provide a feed to the fuel pump relay. The fuel pump relay is also located in the engine compartment fuse box. Inertia Switch Fuse 10 of the engine compartment fuse box (C0575) provides a constant battery feed to the inertia switch (C0123) on a G wire. The inertia switch is a normally closed switch. If the inertia switch hasnt been tripped, current flows across the switch (C0123) to the fuel pump relay (C0575) on a GU wire. The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a UG wire. For more information on the CCU, refer to the Control Units section of the Workshop manual, and the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). Fuel Pump Relay The fuel pump relay coil receives a feed from the energised main relay (see above). The earth path for the relay coil (C0575) is controlled by the ECM (C0331) on a BP wire. The ECM will energise the fuel pump relay when it receives an ignition feed from fuse 22 of the passenger compartment fuse box (C0581) on a W wire. The energised fuel pump relay (C0572) provides a feed to the fuel pump (C0114) on a WP wire. The fuel pump (C0114) is earthed on a B wire. Starter Relay Fuse 5 of the passenger compartment fuse box (C0581) provides an ignition switch crank feed to the immobilisation ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilised, the immobilisation ECU (C0059) provides a feed to the starter relay coil (C0576) on a RW wire. The starter relay is located in the engine compartment fuse box, and is earthed (C0576) on a B wire. A feed from fusible link 7 is now able to flow across the starter relay switch contacts (C0572) to the starter motor solenoid (C0179) on an NR wire. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual. + ENGINE IMMOBILISATION.
DESCRIPTION AND OPERATION 4.48FREELANDER 04MY Starter Motor and Starter Motor Solenoid The starter motor solenoid coil (C0179) receives a feed from the energised starter relay (C0572) on an NR wire (see above). The energised starter motor solenoid allows a battery feed (C0178) to flow across the switch contacts and power the starter motor. Central Control Unit (CCU) The CCU (C0428) receives a feed from the inertia switch (C0123) via the engine compartment fuse box (C0576) on a UG wire. If this feed is removed due to the inertia switch being tripped, the CCU will unlock all of the doors. For more details of the Central Door Locking (CDL) system, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual. + ANTI-THEFT ALARM AND CENTRAL DOOR LOCKING (CDL). NOTE: The CCU will only unlock all doors if the ignition switch is in the ignition position. The CCU (C0429) also provides a signal feed to the immobilisation ECU (C0059) on a KN wire. This signal feed informs the immobilisation ECU to energise the starter relay. For a detailed description of the immobilisation ECU, refer to the Engine Immobilisation section of this manual. + ENGINE IMMOBILISATION. Charging Alternator Fusible link 1 of the engine compartment fuse box (C0826) provides a constant battery feed to the alternator (C0183) on an R wire. Fuse 41 of the passenger compartment fuse box (C0583) provides an ignition feed to the alternator (C0053) on a W wire. When the engine is turned over, the alternator (C0053) supplies the ECM (C0331) with a Pulse Width Modulated (PWM) signal on a GK wire. The ECM uses this PWM signal to calculate the electrical load on the alternator, and controls engine idle speed accordingly. When the engine is started, the magnetised rotor within the stator windings generate 3 phase alternating current (ac) and voltage that rises rapidly with rotor speed. The field diodes in the rectifier pack convert the ac current into direct current (dc). Output current from the field diodes supplements the initial current flowing through the field windings. This causes an increase in the magnetic influence of the rotor, resulting in self-exitation of the alternator. The field current increases with rotor speed and thus increases the generated current and voltage until the alternator is fully excited. The alternator (C0183) charges the battery by providing current via fusible link 1 of the engine compartment fuse box (C0826 & C0632) to the battery positive terminal (C0192) on an R wire.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.49 Ignition/No Charge Warning Lamp Fuse 18 of the passenger compartment fuse box (C0589) provides an ignition feed to the ignition/no charge warning lamp (C0233) on a G wire. Current flows across the lamp (C0233) and is provided an earth path by the alternator (C0053) on an NY wire. The warning lamp will now illuminate. When the alternator is charging, it provides a feed to the warning lamp (C0233) on the NY wire. Because the potential difference across the bulb is 0 V, the lamp will now extinguish.
DESCRIPTION AND OPERATION 4.50FREELANDER 04MY CRUISE CONTROL – TD4 & KV6 (NORTH AMERICA) DESCRIPTION General Cruise control is switched on by pressing the cruise control master switch mounted on the drivers side of the fascia. The Set + and Res switches mounted on the steering wheel allow the driver to either set the vehicle speed as required or resume the last cruising speed set. The cruise control system uses mechanical, electrical and vacuum operated devices to maintain vehicle speed at a setting selected by the driver. As vehicle speed changes due to changes in road gradients, so the cruise control ECU operates the cruise control pump, continually moving the cruise control actuator to maintain the set vehicle speed. Should the driver wish to increase the speed of the vehicle, the Set + switch should be pressed and held. The vehicle will accelerate until the switch is released. As the Set + switch is released, the cruise control ECU will store the new cruise speed in its memory. With cruise control switched on, it is possible to press the accelerator pedal and accelerate through the memorised set speed. When the accelerator is released, the cruise control ECU will automatically return the vehicle to its set speed. Note: The cruise control system will only operate between speeds of 22 mph (35 kph) and 125 mph (201 kph). Cruise control operation can be suspended by one of the following ways: zBy pressing the Res switch. zBy pressing the brake pedal. zThe gearbox is placed in park, neutral, or reverse. zHill Descent Control (HDC) is active. zEngine revs are too high. Under all these conditions, the cruise control set speed will be memorised. Cruise control operation can be resumed by pressing the Res switch. Cruise control operation can be cancelled in one of two ways: zBy pressing the cruise control master switch located on the drivers side of the fascia. zBy switching the ignition off. In both these cases, the cruise control set speed will be lost. Warning: Do not switch off the vehicle ignition unless the vehicle is stationary and the handbrake is applied.
DESCRIPTION AND OPERATION FREELANDER 04MY 4.51 OPERATION General Feed from the positive battery terminal (C0192) is supplied to the main relay, the horn relay, and fusible link 3 (C0632) on an R wire. All are located in the engine compartment fuse box. The earth path for the main relay (C0578) is controlled by the ECM (C0604) on an NG wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. For more information on main relay operation, refer to the Engine Management System – EDC or Engine Management System – Siemens (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 6 of the passenger compartment fuse box (C0588) on a G wire. Cruise Control Master Switch Cruise control is switched on and off by pressing the master switch mounted on the drivers side of the fascia. Fuse 6 of the passenger compartment fuse box (C0581) supplies the cruise control master switch (C0749) an ignition feed on a W then WK wire. When the switch is pressed, current flows across the switch contacts (C0749) to the cruise control interface unit (C0895) on a WY wire. NOTE: When the cruise control system is switched off using the master switch, any stored road speed values will be lost. Cruise Control Interface Unit Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cruise control interface unit (C0895) on an NK wire. The interface unit (C0895) is earthed on a B wire. To enable it to control the cruise control system, the ECU receives a number of inputs from various sources as follows: ABS ECU The ABS ECU (C0501) provides a road speed signal to the cruise control interface unit (C0895) via the CAN-BUS on YN (Low) and YB (High) wires. For more information on the CAN-BUS road speed signal, refer to the Communication Databuses section of the System Description and Operation Workshop manual.