Operation
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 6, fuse 8, and fuse 19 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.
Starting
Main Relay
Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the Engine Control Module (ECM) (C0371) on a W wire. When the ECM receives this feed it energizes the main relay by providing an earth path for the relay coil (C0578) on a WK wire. The energized 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 hasn't 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.
Fuel Pump Relay
The fuel pump relay coil receives a feed from the energized 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 energize the fuel pump relay when it receives an ignition feed from fuse 6 of the passenger compartment fuse box (C0581) on a W wire.
The energized 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 immobilization ECU (C0059) on a WR wire. If the vehicle has been successfully re-mobilized, the immobilization 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.
Starter Motor and Starter Motor Solenoid
The starter motor solenoid coil (C0179) receives a feed from the energized starter relay (C0572) on an NR wire (see above). The energized 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.
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 immobilization ECU (C0059) on a KN wire. This signal feed informs the immobilization ECU to energize the starter relay.
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 19 of the passenger compartment fuse box (C0581) 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 magnetized 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.
Ignition/No Charge Warning Lamp
Fuse 8 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.