B25 THE ENGINE STARTS UP AND CUTS OUT AFTER A FEW SECONDS (BIPOWER, GPL) - Fiat - DUCATO - eLearn

244000449 - B25 THE ENGINE STARTS UP AND CUTS OUT AFTER A FEW SECONDS

When engine fuel supply is set to methane using the appropriate selector, the engine starts normally in petrol mode but then goes off after a few seconds and does not switch to methane.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check there is sufficient methane in the tank by ensuring at least one green led is lit on the control panel gauge	Move on to Step 2	Methane level too low	Introduce enough methane and move on to Step 1
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check that the methane low pressure value is correct by carrying out Test 1044EB. See Test 1044E GAS PRESSURE CONTROL DEVICE	Move on to Step 2	Pressure sensor defective	Replace pressure reduction unit Op. 1044E10 CNG INJECTION SYSTEM PRESSURE REDUCTION UNIT - R R
		Move on to Step 2	Pressure reduction unit defective	Replace pressure reduction unit Op. 1044E10 CNG INJECTION SYSTEM PRESSURE REDUCTION UNIT - R R
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the methane engine management control unit:in error mode no errors in the methane control unit; in parameters ambient: parameter plausibility.	Move on to Step 3	Errors detected in control unit	Continue following the instructions for the diagnostic equipment
			Parameters not plausible	Continue following the instructions for the diagnostic equipment
			No communication with the control unit	Restore the correct connections See E5032 METHANE ENGINE ELECTRONIC MANAGEMENT
3	CHECK METHANE INJECTOR RELAY EFFICIENCY	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the METHANE engine management control unit, in the active diagnosis ambient: correct operation of the methane injector control unit	Move on to Step 4	Relay not working correctly	Replace the relay
4	CHECK METHANE INJECTOR RELAY SUPPLY (power circuit)	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check methane injectors are properly supplied at power relay terminals See E5032 METHANE ENGINE ELECTRONIC MANAGEMENT	Move on to Step 5	Supply not correct	Restore correct power supply See E5032 METHANE ENGINE ELECTRONIC MANAGEMENT
		Move on to Step 5	Wiring defective	Restore wiring See E5032 METHANE ENGINE ELECTRONIC MANAGEMENT
5	CHECK VALVE EFFICIENCY ON REDUCTION UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the METHANE engine management control unit, in the active diagnosis ambient: correct valve operation on reduction unit	Move on to Step 6	Solenoid not working properly	Replace the solenoid valve
6	CHECK SOLENOID EFFICIENCY ON REDUCTION UNIT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check power supply to solenoid terminals efficient	End of diagnosis	Supply not correct	Restore correct power supply See E5032 METHANE ENGINE ELECTRONIC MANAGEMENT
	Check power supply to solenoid terminals efficient	End of diagnosis	Wiring defective	Repair the wiring See E5032 METHANE ENGINE ELECTRONIC MANAGEMENT

When engine fuel supply is set to LPG using the appropriate selector, the engine starts normally in petrol mode but then goes off after a few seconds and does not switch to LPG.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check there is sufficient LPG in the tank by ensuring at least one green led is lit on the control panel gauge.Check that the LPG pump current sensor is correctly inserted in its seat.Check LPG filter condition	Move on to Step 1	LPG level low	Add a sufficient quantity of LPG
			Current sensor incorrectly fitted	Refit relay correctly
			LPG filters blocked	Replace the filters
1	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the LPG engine management control unit:in errors mode: no errors in the LPG control unit; in parameters ambient: parameter plausibility.	Move on to Step 2	Errors detected in control unit	Continue following the instructions for the diagnostic equipment
		Move on to Step 2	Parameters not plausible	Continue following the instructions for the diagnostic equipment
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the absorption of the LPG pump is correct by carrying out Test 1043AA. See Test 1043A GPL TANKCheck the current sensor is working properly	Move on to Step 3	LPG pump absorption faulty	Replace the LPG pump
		Move on to Step 3	Current sensor defective	Replace current sensor
3	CHECK LPG INJECTOR RELAY EFFICIENCY	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the LPG engine management control unit, in the active diagnosis ambient: correct operation of LPG injector relay; correct injector operation	Move on to Step 4	Relay not working correctly	Replace the relay See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
4	CHECK LPG INJECTOR RELAY SUPPLY (power circuit)	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check gas injectors are properly supplied at power relay terminals. See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT	Move on to Step 5	Supply not correct	Restore correct power supply. See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
		Move on to Step 5	Wiring defective	Repair wiring. See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
5	CHECK SUPPLY TO LPG SOLENOID/PUMP UNIT CURRENT SENSOR (power circuit)	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check power supply to solenoid terminals is efficient	Move on to Step 6	Supply not correct	Restore correct power supply. See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
	Check power supply to solenoid terminals is efficient	Move on to Step 6	Wiring defective	Repair the wiring See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
6	CHECK LPG DELIVERY AND RETURN SOLENOIDS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the LPG engine management control unit, in the active diagnosis ambient: Correct operation of LPG delivery and return solenoids Also check the operation of the LPG return solenoid valve, by carrying out Test 1043BC; check the operation of the LPG cut out solenoid valve on the supply line, by carrying out Test 1043BD. See Test 1043B GPL FUEL CIRCUIT PIPES	Move on to Step 7	Delivery solenoid defective	Replace the solenoid valve
		Move on to Step 7	Return solenoid defective	Replace the solenoid valve
7	CHECK LPG LEVEL SENSOR OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the LPG level sensor is working properly, by carrying out Test 1043AE. See Test 1043A GPL TANK	Move on to Step 8	Level sensor defective	Change the level sensor
8	CHECK LPG SOLENOID AND PUMP UNIT POWER SUPPLY	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the supply to LPG solenoid/pump unit is correct. See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT	Move on to Step 9	Supply not correct	Restore correct power supply. See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
9	LPG PUMP OPERATION CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the LPG engine management control unit, in the active diagnosis ambient: correct operation of the LPG pump Check the operation of the pump, by carrying out Test 1043AA. See Test 1043A GPL TANK	Move on to Step 10	LPG pump defective	Replace LPG pump
			Wiring defective	Restore wiring See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
			Supply not correct	Restore correct power supply See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
10	CHECK LPG UPTAKE SOLENOID	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment to the diagnostic connector and check the following at the LPG engine management control unit, in the active diagnosis ambient: operation of the LPG uptake solenoid on the cylinder. Check the LPG uptake solenoid is working efficiently	End of diagnosis	Solenoid defective	Replace uptake solenoid
			Wiring defective	Restore wiring See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT
			Supply not correct	Restore correct power supply See E5031 LPG FUEL SYSTEM ELECTRONIC MANAGEMENT