4.4.1 Description: Notes

Fuel system monitoring checks the correction that has been applied by the feedback control system against pre-determined limits.

There are 2 elements to this diagnostic. The first checks for the short term exceedance of a rich or lean limit value. This function will usually pick up any step changes that have occurred in the fuel system. The second element checks for a longer term exceedance of a lower limit value. This part of the diagnostic is more likely to detect aging effects in the fuel system. Since the engine consists of 2 banks of cylinders, each with separate fuelling control the fuel system monitor will report faults independently for each of the banks.