The Adaptive Fuel Monitor is a continuous test and operates when-ever the engine is running. It is controlled entirely by the On-Board Diagnostics (OBD) system and monitors the system Fuel Trims.

Measurements made by the Adaptive Fuel Monitor tests enables the On-Board Diagnostics software to adapt to a deterioration in the sensors and the catalysts over a period of time by utilising Long Term Fuel Trims. The Jaguar X-Type uses two basic fuel control systems:

Speed density systems, uses rpm, manifold absolute pressure (MAP) and barometric pressure to calculate engine load.

Mass airflow systems, which use the mass airflow sensor (MAF) and rpm. to calculate engine load.

After the vehicle battery is removed it is necessary to re-initialise OBD Adaptive Fuel Monitor table values as follows:-

  • Start engine and bring to normal operating temperature > 82 °C (180 °F).
  • Idle for a minimum of 10 minutes

source of technical information Jaguar Cars JTIS

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