Instrument pack operation

INSTRUMENT PACK OPERATION

The main power source for the instrument pack is from fuse link 2 in the engine compartment fuse box via the starter switch and fuse A4 in the passenger compartment fuse box on a W wire. The earth path is on a B wire.

Coolant temperature gauge

The temperature gauge receives stabilised voltage from the stabiliser unit and a signal on a GU (Spi) or KG-GU (Mpi) wire from the MEMS control unit which reflects the temperature detected by the coolant temperature sensor.

Fuel Gauge

The fuel gauge receives stabilised voltage from the stabiliser unit. The gauge pointer deflects dependent on the resistance between the GB connection at the sender unit and earth representing the quantity of fuel in the tank. The earth path to the sender unit is on a B wire.

When the sender unit float is at its lowest point, indicating an empty fuel tank, the resistance to earth is at its greatest value. The resistance value to fuel gauge position is:

Clock

The analogue clock has a permanent earth on a B wire and while the starter switch is in position O, battery voltage is supplied from fuse C4 on a PO wire.