22 · Diagnostics

Engine does not switch to gas

Make: Fiat
Model: Multipla Factory Service Manual
Year: 1998–2010
Section: Engine › Engine does not switch to gas

‹ Prev Engine cuts out whilst driving Next › Engine overheating / with the fan working

Fault diagnosisEngine does not switch to gas

ENGINE DOES NOT SWITCH TO GAS

1.6 16v · GPOWER

The engine starts normally on petrol, but does not then switch to gas.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Preliminarily check: that there is LPG in the tank	Continue to Step 1	LPG level insufficient	Restore the correct LPG level
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the petrol and LPG engine management control unit: in errors ambient that there are no faults in the petrol and LPG engine management control units In parameters ambient the plausibility of all the parameters	Continue to Step 3	Error detected in the petrol engine management control unit	Continue following the instructions for the diagnostic equipment
			Error detected in the LPG engine management control unit	Proceed as indicated on the tester
			Failed dialogue between the petrol engine management control unit and the LPG engine management control unit	Restore the connection between the petrol and LPG control units See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			No connection to earth for LPG control unit	Restore the earth connection See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			LPG pressure greater than or equal to 20 bar	Continue to Step 2
2	LPG LEVEL SENSOR FLOAT AND 80% TANK FILLING VALVE CHECK	All OK	Problems met	Operation
	Detach the LPG tank, drain it by sending it to an authorized centre and check the following: that the 80% tank filling valve is working properly that the LPG level float is working properly See Test 1043AE LPG level potentiometer operation check	Continue to Step 3	80% Filling valve faulty	80% tank filling valve Op. 1043A24
		Continue to Step 3	Float defective	Replace the float Op. 1043A62
3	GAS/PETROL SELECTOR BUTTON CHECK	All OK	Problems met	Operation
	Using the Examiner diagnostic equipment connected to the diagnostic connector, check the following at the engine management control unit: in errors ambient that the GAS/Petrol switch is working properly Check the operation of the GAS/Petrol switch See Test 1057A Petrol/LPG switch operation check	Continue to Step 4	GAS/PETROL switch defective	Replace switch
			Wiring broken	Renew the wiring See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			Selector supply interrupted	Restore the continuity of the wiring See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			LPG control unit defective	Replace the LPG control unit Op. 1057B80
4	LPG LEVEL SIGNAL CHECK	All OK	Problems met	Operation
	Check, in order: that the LPG level sensor is correctly supplied that the LPG level sensor voltage signal to the LPG control unit is correct See Test 1043AD Check operation of LPG level sensor	Continue to Step 5	LPG level sensor supply not correct	Restore correct supply See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
			LPG level sensor defective	Replace the LPG level sensor Op. 1043A60
			LPG sensor float faulty	Replace the float Op. 1043A62
5	LPG PRESSURE CHECK	All OK	Problems met	Operation
	Check, in order: the correct operation of the LPG pump See Test 1043AA Check operation of LPG pump the correct operation of the pressure sensor See Test 1043BB LPG pressure sensor check the correct operation of the pressure regulator	Continue to Step 6	LPG pump defective	Replace the LPG pump Op. 1043A57
			LPG pump control unit defective	Replace the LPG pump control unit Op. 1043A54
			Pressure sensor defective	Replace the pressure regulator Op. 1043B42
			Faulty wiring	Renew the wiring See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
6	ENGINE MANAGEMENT CONTROL UNITS CAN CONNECTING LINE CHECK	All OK	Problems met	Operation
	Check the continuity/insulation of the CAN line connecting the petrol engine management control unit and the LPG engine management control unit See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT	Continue to Step 7	CAN line interrupted	Restore continuity See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
		Continue to Step 7	CAN line short circuited	Repair the insulation See E5030 PETROL ENGINE ELECTRONIC MANAGEMENT
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

‹ Prev Engine cuts out whilst driving Next › Engine overheating / with the fan working

Parts & tools for this job For 1998 Fiat Multipla

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.