Starting Glow Plug Relay

Starting Glow Plug Relay

The energised main relay (C0063) provides a feed to the glow plug relay (C0215) on an NO wire. The earth path for the glow plug relay coil (C0215) is controlled by the Engine Control Module (ECM) (C0158) on a GU wire. The ECM provides an earth path for the relay coil to control both pre and post heat. Pre-heat is determined by battery voltage and engine coolant temperature. Post heat is determined solely by engine coolant temperature.

For more information on glow plug operation, refer to the Engine Management System – Td5 section of the Workshop manual.

The energised glow plug relay (C0215) provides a feed to the following on a YB then B wires:

Glow plug number 1 (C0476) Glow plug number 2 (C0477) Glow plug number 3 (C0478) Glow plug number 4 (C0479).

NOTE: Cylinder number 5 does not have a glow plug.

Glow Plug Warning Lamp

Operation of the glow plug warning lamp is controlled by the ECM. The ECM (C0658) provides a feed to the glow plug warning lamp (C0233) on a BY wire. The lamp (C0230) is earthed on a B wire.

Starter Relay

When the ignition switch is turned to the 'crank' position, current flows across the switch (C1731 on LHD, C0090 on RHD) to the starter relay coil (C0151) on a WR wire. The earth path for the starter relay coil (C0151) is controlled by the anti-theft alarm ECU (C1980 on LHD, C0057 on RHD) on a BO wire. For more information, refer to the Anti-theft Alarm and Central Door Locking (CDL) section of this manual.  ANTI–THEFT ALARM AND CENTRAL DOOR LOCKING (CDL).

The energised starter relay (C0151) provides a feed to the starter motor solenoid (C0179) on an NR wire. A battery feed is now able to flow across the starter motor solenoid switch contacts to power the starter motor.