9-3 SE Sedan (9400) L4-2.0L Turbo (B204) HO (1999)
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When the contents of the fuel tank are down to about 10 litres, the low fuel level lamp comes on. This lamp is supplied with current in the main
instrument unit and when it should light up it is grounded by the main instrument unit's control module.
The main instrument unit lights this lamp for 3 seconds when the ignition is switched on.
Fuel consumption
Main instrument unit pin 11 (K22) is connected to injector No. 3 (all engine management systems) and measures the duration of the injection pulse as a
basis for calculating fuel consumption. The main instrument unit uses this information to control the fuel gauge below 10 litres.
The main instrument unit sends the information Fuel Consumed Since Start, unit 0-65535 ml out on the bus.
Diagnostics, fuel consumption
An open circuit when engine speed is above 310 rpm will generate diagnostic trouble code B1730. A short circuit will generate a diagnostic trouble code
in the engine management system.
Low Fuel Level (OBDII)
At the same time as the low fuel level indicator lamp comes on, pin 13 (K22), connected to the engine management system, is grounded. This function is
used only for OBDII diagnostics.
