P0087 PRESS. ON INJECTOR SUPPORT - Fiat - NUOVA 500 - eLearn

312002940 - P0087 Press. on injector support

The error is identified if the rail pressure is lower than a set threshold (dependent on engine rpm)

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Check that, at the same time as this error, there are none of the following errors present:- P0003- P0093- P0262- P0265- P0268- P0271	Move on to Step 1	At least one of the errors indicated is present	This error is indicated by first level diagnosis and is therefore subordinate to the other errors: continue as instructed by the diagnostic equipment relating to the other errors present
1	POWER SUPPLY CIRCUIT CHECK	All OK	Problems encountered	Operation
	Check there are no faults in the fuel supply circuitSee Test 1040OA	Move on to Step 2	-	-
2	FUEL PUMP RELAY CHECK	All OK	Problems encountered	Operation
	Check that the fuel pump relay operates correctly	Move on to Step 3	-	-
3	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel pressure parameter is correct See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK	Move on to Step 13	Pressure not correct	Move on to Step 4
4	INJECTOR HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another. See Test 1060OC INJECTOR SEAL TEST	Move on to Step 5	Significant leak from one injector	Replace the injector Op. 1060F11 INJECTOR ONE R R
5	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the pressure in the return pipe to the tank is less than 1 bar See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK	Move on to Step 6	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe, if necessary, replace it
6	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar	Move on to Step 12	Pressure below the minimum limit or above the maximum limit	Move on to Step 7
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Constrict the return pipe downstream of the valve and carry out the test once again with the pipe constricted checking that the pressure at the filter outlet remains below 2 bar See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 8	Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted	Replace the valve
8	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 9	Difference in pressure more than 1 bar	Replace the fuel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
9	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 12	Pressure below 2.2 bar	Move on to Step 10
10	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 11	Difference in pressure more than 0.3 bar	Replace the pipe
11	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the pump supply voltage is equal to 13V and that the current uptake is between 2 and 10 ASee Test 1040AA	Move on to Step 12	1. Voltage lower than 12 V2. Current out of range: pump defective	1. Renew electrical wiring See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT 2. Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
12	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the pressure pump and check that the fault is no longer present Op. 1060E10 DIESEL INJECTION PRESSURE PUMP - R.R.	End of diagnosis	Fault persists	Contact technical service for further information on the problem
13	CHECK ON CORRECT OPERATION	All OK	Problems encountered	Operation
	Replace the engine management control unit and check that the fault is no longer present Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R	End of diagnosis	Fault persists	Contact technical service for further information on the problem

The error is identified if the rail pressure is lower than a set threshold (dependent on engine rpm)

1	POWER SUPPLY CIRCUIT CHECK	All OK	Problems encountered	Operation
		Test results
	Check there are no faults in the fuel supply circuitSee Test 1040OA	Move on to Step 2
2	FUEL PUMP RELAY CHECK	All OK	Problems encountered	Operation
	Check that the fuel pump relay operates correctlySee Test 1040AD CHECK FUEL PUMP RELAY OPERATION	Move on to Step 3
3	HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel pressure parameter is correct See Test 1060OD HIGH PRESSURE FUEL CIRCUIT CHECK	Move on to Step 13	Pressure not correct	Move on to Step 4
4	INJECTOR HIGH PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel leaks from the injector recirculation connections are small (seepage) and roughly equal to one another. See Test 1060OC INJECTOR SEAL TEST	Move on to Step 5	Significant leak from one injector	Replace the injector Op. 1060F11 INJECTOR ONE R R
5	LOW RETURN PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the pressure in the return pipe to the tank is less than 1 bar See Test 1060OA LOW FUEL RETURN PRESSURE CIRCUIT CHECK	Move on to Step 6	Pressure above the maximum limit: return pipe to the tank obstructed	Repair the pipe, if necessary, replace it
6	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Check that the diesel pressure between the filter and the pressure pump is between 2 and 3 bar See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 12	Pressure below the minimum limit or above the maximum limit	Move on to Step 7
7	LOW SUPPLY PRESSURE CHECK	All OK	Problems encountered	Operation
	Constrict the return pipe downstream of the valve and carry out the test once again with the pipe constricted checking that the pressure at the filter outlet remains below 2 bar See Test 1060OB LOW FUEL DELIVERY PRESSURE CIRCUIT CHECK	Move on to Step 8	Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted	Replace the valve
8	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 9	Difference in pressure more than 1 bar	Replace the fuel filter cartridge Op. 1044B10 FUEL FILTER ASSEMBLY - R + R OR REPLACE
9	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 12	Pressure below 2.2 bar	Move on to Step 10
10	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 11	Difference in pressure more than 0.3 bar	Replace the pipe
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