312002937 - P0005 High pressure pump shut-off valve

This error is recorded after three consecutive tests with errors.The test is carried out in cut-off conditions, disconnecting the electric pump and checking that the drop in pressure corresponds to an actual closing of the shut-off valve. If the pressure remains too high it can be deduced that the valve is stuck open

		Test results
0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Check that the fuel pump relay is working properly, carrying out test 1040AD    See Test 1040A FUEL TANK AND COMPONENTS	Move on to Step 1	-	-
1	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check as described in the    See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECKthat the diesel pressure parameter is correct.	Move on to Step 12	Pressure not correct	Move on to Step 2
2	INJECTOR HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check, as instructed in the    See Test 1060OC INJECTOR SEAL TEST, that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another.	Move on to Step 3	Significant leak from one injector	Replace the injector    Op. 1060F11 INJECTOR ONE R R
3	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check as described in the    See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECKthat the pressure in the return pipe to the tank is less than 1 bar	Move on to Step 4	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe, if necessary, replace it
4	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check as described in the    See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECKthat the diesel pressure between the filter and the pressure pump is between 2 and 3 bar	Move on to Step 10	Pressure below the minimum limit or above the maximum limit	Move on to Step 5
5	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Constrict the return pipe downstream of the valve and carry out the test once again    See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECKwith the pipe constricted checking that the filter outlet pressure remains below 2 bar	Move on to Step 6	Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted	Replace the valve
6	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Move on to Step 7	Difference in pressure more than 1 bar	Replace the fuel filter cartridge    Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the supply pump pressure at the filter inlet is more than 2.2 bar	Move on to Step 10	Pressure below 2.2 bar	Move on to Step 8
8	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Measure the difference in pressure between the electric pump outlet and the filter inlet and check that it is less than 0.3 bar	Move on to Step 9	Difference in pressure more than 0.3 bar	Replace the pipe
9	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check as described in theSee Test 1040AA that the pump supply voltage is equal to 13V and that the current uptake is between 2 and 10 A	Move on to Step 10	Voltage lower than 12 V	Renew electrical wiring    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
			Current outside of the range: pump defective	Replace the fuel pump    Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
10	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the high pressure regulation valve and check that the fault is no longer present.	End of diagnosis	Fault persists 1	Move on to Step 1
11	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the pressure pump    Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R. and check that the fault is no longer present	End of diagnosis	Fault persists	Contact technical service for further information on the problem
12	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the engine management control unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R and check that the fault is no longer present	End of diagnosis	Fault persists	Contact technical service for further information on the problem