72352 - B20 ENGINE STARTS AND CUTS OUT STRAIGHT AWAY

The engine starts normally, though possibly with difficulty, then suddenly stalls

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the following, in order: no water, other fluids or dirt in the fuel filter no water, other fluids or dirt in the fuel tank fuel no obstructions in the catalytic converter	Move on to Step	1. Water, other fluids or dirt in the fuel filter	1. Replace the filter element
			2. Water, other fluids or dirt in the fuel tank	2. Clean tank
			3. Catalytic converter obstructed	3. Replace the catalytic converter
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Re-create the conditions under which the fault occurs and check: that there are no errors in the control unit; parameter plausibility	Move on to Step	1. Errors detected in control unit	1. Continue following the instructions for the diagnostic equipment
			2. Parameters not plausible	2. Continue following the instructions for the diagnostic equipment
			3. No communication with the control unit	3. Restore the correct connections (Wiring Diagram ) E5050 DIESEL ENGINE ELECTRONIC MANAGEMENT
2	HIGH PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check that the diesel pressure parameter is correct as described in < R1 >     Continue following the instructions in the test 1060D Injector high pressure fuel circuit check	Move on to Step	Pressure not correct	Move on to Step
3	LOW RETURN PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check as described in < R1 > that the pressure in the return pipe to the tank is less than 1 bar    Continue following the instructions in the test 1060A Low pressure fuel return circuit check	Move on to Step	Pressure greater than maximum limit (return pipe to tank blocked)	Repair the pipe and replace if necessary
4	LOW SUPPLY PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the diesel pressure between the filter and radial jet pump < R1 > is between 2 and 3 bar.    Continue following the instructions in the test 1060B Low pressure fuel supply circuit check	Move on to Step	Pressure below the minimum limit or above the maximum limit	Move on to Step
5	LOW SUPPLY PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Constrict the return pipe, downstream of the low pressure regulation valve, and carry out < R1 > again with the pipe constricted checking that the pressure at the filter outlet stays below 2 bar    Continue following the instructions in the test 1060B Low pressure fuel supply circuit check	Move on to Step	Pressure rises to 5 bar: pressure regulator valve on filter mounting incorrectly adjusted	Replace the valve    See in Op. 1044B16 Fuel supply/return adjustment valve on fuel filter - R.R.
6	LOW SUPPLY PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the difference in pressure upstream and downstream of the filter is less than 1 bar	Move on to Step	Difference in pressure more than 1 bar	Replace the fuel filter cartridge    See in Op. 1044B16 Fuel supply/return adjustment valve on fuel filter - R.R.
7	LOW SUPPLY PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the supply pump pressure at the filter inlet is more than 2.2 bar	Move on to Step	Pressure below 2.2 bar	Move on to Step
8	LOW SUPPLY PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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	Difference in pressure more than 0,3 bar	Replace the pipe
9	LOW SUPPLY PRESSURE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, as described in Test < R1 > that the pump supply voltage is equal to 12 volt and that the current absorbed is between 2 and 10 Ampere    Continue following the instructions in the test 1040AA Check the supply voltage and the absorption current	Move on to Step	1. Voltage lower than 12 volts	1. Check the wiring at the connection leads (Wiring Diagram ) E5050 DIESEL ENGINE ELECTRONIC MANAGEMENT
			2. Current greater than 10 Amps: pump defective	2. Replace the fuel pump assembly    See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
			3. Current less than 2 Amps: Jet pump blocked	3. Change fuel pump assembly < R1 > and clean tank    See in Op. 1040A70 SUBMERGED PUMP ASSEMBLY complete with level gauge - R.R.
10	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the DRV high pressure regulation valve and check that the fault is no longer present		Fault persists	Move on to Step
11	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Replace the high pressure pump and check that the fault is no longer present		Fault persists control unit defective	Replace the engine management control unit    See in Op. 1060G80 Diesel electronic injection system CONTROL UNIT - R.R.