Fuel Gauge

Fuel Gauge

Fuse 15 of the passenger compartment fuse box (C0580) provides an ignition feed to the fuel gauge (C1054) on a WG wire.

The fuel tank sender unit provides a feed to the instrument pack (C1061) on a GB then LGB wire. The voltage supplied to the instrument pack varies in relation to fuel level. The fuel gauge (C1054) is earthed on a B wire.

Engine Coolant Temperature Gauge

Fuse 15 of the passenger compartment fuse box (C0580) provides an ignition feed to the engine coolant temperature gauge (C1052) on a WG wire.

Td5 The Engine Control Module (ECM) (C0658) provides a 5 V feed to the Engine Coolant Temperature (ECT) sensor (C0169) on a KG wire. As coolant temperature increases, the resistance of the sensor decreases. By measuring the resistance of the sensor on a KB wire, the ECM can determine ECT. The ECM (C0658) then provides a Pulse Width Modulated (PWM) ECT signal to the gauge on a GU then LGU wire. The gauge (C1052) is earthed on a B wire.

300 Tdi The Engine Coolant Temperature (ECT) sensor (C0169) provides an ECT signal to the instrument pack (C1052) on a GU then LGU wire. The gauge (C1052) is earthed on a B wire.

Speedometer

The speedometer (C1060) receives a constant battery feed from fuse 30 of the passenger compartment fuse box (C0595) on a PN wire. The speedometer (C1060) also receives an ignition feed from fuse 15 of the passenger compartment fuse box (C0580) on a WG wire. The speedometer (C1060) is earthed on a B wire.

The speed transducer (C0195) provides a square wave, pulsed speed signal to the instrument pack (C1060) on a BR wire. The instrument pack uses this signal to drive the speedometer. The speedometer also doubles the frequency of pulses (from 4100 per mile to 8200 per mile) and provides an output to the ECM (C0658 – Td5 vehicles only) and the overspeed ECU (C1311 – Gulf specification vehicles only) on YK wires.

The anti-theft alarm LED is also contained within the speedometer, and is driven by the antitheft alarm ECU (C1980 on LHD, C0057 on RHD) on a K 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).