Fuel pump - Td5

FUEL PUMP - Td5

DESCRIPTION

The fuel pump is located above the fuel tank, and is controlled by the Engine Control Module (ECM). See ENGINE MANAGEMENT - Td5.

OPERATION

Feed from the battery positive terminal is connected to fuse 4 and fusible link 5 of the engine compartment fuse box (C0632-1) by a brown wire. Fusible link 5 (C0570-2) is connected to the ignition switch (C0028-1) by a brown/white wire.

With the ignition switch in position ’II’ (C0094-1) current flows across the switch to fuse 5 of the passenger compartment fuse box (C0580-9) on a white wire. Fuse 5 (C0580-10) supplies an ignition feed to the ECM (C0658-33) on a white/green wire.

The ECM provides a 12 volt signal to both sides of the fuel pump relay coil on brown/orange (C0730-4) and blue/purple (C0730-6) wires. As the potential difference across the relay coil is 0 volts, the relay remains de-energised. When the ECM receives the correct signal from the alarm ECU, it withdraws the feed on the blue/purple wire. The fuel pump relay is now energised.

The energised fuel pump relay now allows a battery feed from fuse 4 of the engine compartment fuse box (C0573-1) on a purple/white wire to flow across the relay (C0730-8 & C0730-2). The relay can now supply a feed to the fuel pump (C0114-1) on a purple/white then white/purple wire. The pump is earthed (C0114-4) on a black wire.