Starting Main Relay

Starting Main Relay

The earth path for the main relay coil (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. The energised main relay provides a feed to fuse 1 which is also located in the engine compartment fuse box. Fuse 1 (C0576) provides a feed to the glow plug relay (C0215) on an RW wire.

For a detailed description of main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.

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 coil (C0730) on a GU wire.

The inertia switch (C0123) also provides a feed to the Central Control Unit (CCU) (C0428) on a GU 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 (C0730) receives a feed from the inertia switch (C0123) on a GU wire. The earth path for the relay coil (C0730) is controlled by the ECM (C0331) on a BP wire. The energised fuel pump relay enables a feed from fuse 10 of the engine compartment fuse box (C0575) to flow across the relay switch contacts to the tank mounted fuel pump (C0114) and the secondary fuel pump (C0205) on WP wires. Both pumps are earthed on B wires.

Glow Plug Relay

Fuse 6 of the passenger compartment fuse box (C0581) provides an ignition feed to the ECM (C0603) on a W wire. If all criteria are met, the ECM (C0606) provides an earth path for the glow plug relay coil (C0215) on a BR wire.

Fusible link 6 of the engine compartment fuse box (C0577) provides a constant battery feed to the glow plug relay switch (C0215) on an NW wire. When the relay is energised, the switch contacts close, allowing the glow plug relay to provide a feed to the following:

To glow plug number 1 (C0476) on a BG wire. To glow plug number 2 (C0477) on a BP wire. To glow plug number 3 (C0478) on a BY wire. To glow plug number 4 (C0479) on a BR wire.

For more details of glow plug operation, refer to the Engine Management Systems – EDC section of the Workshop manual.