P0090 Fuel press. (high press. pump input regulat.)

			Test results
1	COMPONENT CONCERNED	FUEL RECIRCULATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Fuel recirculation	Check that the recirculated fuel pressure is correct	Go to Step 2	Recirculation obstructed	Restore the obstructed pipe
2	COMPONENT CONCERNED	ELECTRICAL CONNECTION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Low pressure pump wiring	Check the wiring continuity	Go to Step 3	Wiring defective	Restore the correct wiring
3	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 4	Pump faulty	Replace the fuel pump Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
4	COMPONENT CONCERNED	HP PUMP PRESSURE REGULATOR OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Pressure regulator	Check that the pressure regulator is working correctly using Examiner in Active Diagnosis	End of diagnosis	Pressure regulator blocked	Replace the high pressure pump Op. 1060E10 PRESSURE PUMP FOR DIESEL INJECTION - R.R.