939005226 - Y106 P0778 - FUEL PRESSURE REGULATOR (HIGH PRESSURE PUMP OR FLUTE OUTLET)

The diagnostic equipment signals: Error P0778 (fuel pressure regulator (high pressure pump outlet or pipe).
This error is detected if there is a break in the circuit connected to Pins 4 and 34 of the control unit for at least 0.28 secs. (detail "open circuit"), if there is a short circuit to positive in the circuit connected to Pin 34 of the control unit for at least 0.28 secs (detail "short circuit to +Vbatt"), if there is a short circuit to earth in the circuit connected to Pin 34 of the control unit for at least 0.22 secs. (detail "short circuit to earth") or if the temperature of the electronic control module measured is not within the limits for at least 0.28 secs (detail "excessive temperature").
1Check on operation of fuel pressure regulator on the railALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fuel pressure regulator on the rail is working properly by carrying out the test    See Test 1060GR CHECK OPERATION OF FUEL PRESSURE SENSOR ON RAILEnd of diagnosis