P0091 Fuel press. (high press. pump input regulat.)

			Test results
0	COMPONENT CONCERNED	PRELIMINARY CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Fuel tank	Check that there is fuel in the tank	Go to Step 1	No fuel in the tank	Top up the fuel with the correct amount
1	COMPONENT CONCERNED	LOW PRESSURE CIRCUIT CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Low pressure circuit	Check that there are no leaks in the low pressure circuit	Go to Step 2	Leaks from the low pressure circuit	Restore the sealing of the system
2	COMPONENT CONCERNED	ELECTRICAL CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Low pressure pump wiring	Check the continuity of the wiring between pump and dashboard control unit	Go to Step 3	Wiring defective	Restore the correct wiring
3	COMPONENT CONCERNED	PUMP FUSE CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Low pressure pump fuse	Check the condition of the pump fuse	Go to Step 4	Blown pump fuse	Replace the fuse after ascertaining the cause of the malfunction
4	COMPONENT CONCERNED	PUMP RELAY SWITCH CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Low pressure pump relay switch	Check that the pump relay switch is working correctly	Go to Step 5	Relay defective	Replace the relay
5	COMPONENT CONCERNED	LOW PRESSURE PUMP CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Low pressure pump	Check that the low pressure pump is working correctly	Go to Step 6	Low pressure pump defective	Replace the low pressure pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
6	COMPONENT CONCERNED	DIESEL FILTER CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Diesel filter	Check that the over-flow valve at the diesel filter is not blocked open	Go to Step 7	Filter valve blocked open	Replace the diesel fuel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R.R. OR REPLACE
7	COMPONENT CONCERNED	DIESEL FILTER CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Diesel filter	Check that the diesel filter is not obstructed	Go to Step 8	Diesel filter clogged	Replace diesel filter Op. 1044B10 FUEL FILTER ASSEMBLY - R.R. OR REPLACE
8	COMPONENT CONCERNED	FUEL PIPE CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Fuel pipe	Check that the fuel pipe is not obstructed	Go to Step 9	Fuel pipe obstructed	Restore the fuel pipe to correct operation
9	COMPONENT CONCERNED	INJECTOR CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Injectors	Check that the injector recirculation is not excessive and that the injectors are not blocked open	Go to Step 10	Injectors defective	Replace the injectors Op. 1060F11 INJECTOR ONE R R
10	COMPONENT CONCERNED	PRESSURE REGULATOR CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Pressure regulator	Check that the pressure regulator is working correctly	Go to Step 11	Regulator faulty	Replace the high pressure pump Op. 1060E10
11	COMPONENT CONCERNED	HIGH PRESSURE PUMP CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	High pressure pump	Check that the high pressure pump is working correctly	End of diagnosis	High pressure pump faulty	Replace the high pressure pump Op. 1060E10