4.19.1 Sensor Stuck

This monitor checks that the fuel rail temperature (FRT) sensor is not stuck at a particular value. If the engine has been off for longer than a calibrated time, the next time the engine is started the diagnostic will run.

If the engine speed exceeds a calibrated limit, the fuel rail temperature must change by a calibrated amount within a set period of time after engine start or a failure will be flagged. If the fuel rail temperature changes by an amount equal to or greater than this threshold a normal judgement is made.