3315447 - 5020MB Check operation of pump dispensing/delivering fuel to supplementary stand-alone heater

Connect the Examiner/SDC diagnostic instrument to the diagnostic socket.Check that the resistance of the winding on the fuel metering/delivery pump to the additional heater is about 10 ohm.Check with the engine running and the heater on, that the output signal from pin 6 control unit is between the maximum and minimum limits of 3.8 V and 0.9 V.Check that the pump's connection to earth is not broken.