1060OD HIGH PRESSURE FUEL CIRCUIT CHECK - Fiat - NUOVA 500 - eLearn

312002091 - 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK

STEP	CHECK TO BE PERFORMED	REMEDIAL ACTION IF THE CHECK IS NOT OK
1	High pressure fuel checkConnect the Examiner diagnostic equipment and select the engine control unitSelect the diesel fuel pressure parameterTurn the key to the AVV position for several secondsCheck that the pressure is around 300 bar.	Move on to Step 2
2	Low pressure system check If the high pressure value is wrong, check:If the tank is empty or the low pressure fuel pump filter is blocked/dirty, if the low pressure pump is defective or the pressure relief valve (built into the pump) is blocked openLow pressure pump relay faulty Fuse blownLow pressure pump wiring interruptedFuel filter blockedLeaks from the low pressure hydraulic circuitOVER-FLOW valve on the filter faulty	Fill the tank with sufficient fuelReplace the submerged electric pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R Replace the relayReplace 15A fuse F21 after finding out what caused it to blow See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Restore the correct wiring continuityReplace fuel filter [PR_1044B10]Restore the correct system sealReplace the fuel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
3	High pressure system check Check: There are no fuel leaks in the high pressure circuit Injector/s blocked open or with excessive recirculation Pressure regulator on rail blocked open or with excessive recirculation Rail pressure sensor faulty, value within electrical range but not plausible High pressure pump defective (low efficiency)	Restore the correct system seal.Replace faulty injectorsOp. 1060F10 Replace pressure regulator on rail Op. 1060G31 FUEL PRESSURE REGULATOR ON SINGLE MANIFOLD TO INJECTORS - R R Replace the pressure sensor Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R Replace the high pressure pump Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.

STEP

CHECK TO BE PERFORMED

REMEDIAL ACTION IF THE CHECK IS NOT OK

High pressure fuel checkConnect the Examiner diagnostic equipment and select the engine control unitSelect the diesel fuel pressure parameterTurn the key to the AVV position for several secondsCheck that the pressure is around 300 bar.

Move on to Step 2

Low pressure system check If the high pressure value is wrong, check:If the tank is empty or the low pressure fuel pump filter is blocked/dirty, if the low pressure pump is defective or the pressure relief valve (built into the pump) is blocked openLow pressure pump relay faulty Fuse blownLow pressure pump wiring interruptedFuel filter blockedLeaks from the low pressure hydraulic circuitOVER-FLOW valve on the filter faulty

Fill the tank with sufficient fuelReplace the submerged electric pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R Replace the relayReplace 15A fuse F21 after finding out what caused it to blow See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Restore the correct wiring continuityReplace fuel filter [PR_1044B10]Restore the correct system sealReplace the fuel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE

High pressure system check

Check:

There are no fuel leaks in the high pressure circuit
Injector/s blocked open or with excessive recirculation
Pressure regulator on rail blocked open or with excessive recirculation
Rail pressure sensor faulty, value within electrical range but not plausible
High pressure pump defective (low efficiency)

Restore the correct system seal.Replace faulty injectorsOp. 1060F10 Replace pressure regulator on rail Op. 1060G31 FUEL PRESSURE REGULATOR ON SINGLE MANIFOLD TO INJECTORS - R R Replace the pressure sensor Op. 1060G28 FUEL PRESSURE SENSOR ON FUEL MANIFOLD TO INJECTORS - R.R Replace the high pressure pump Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.

Fuel circuit