22 · Diagnostics

Fuel reserve warning light not working

Fault diagnosisFuel reserve warning light not working

FUEL RESERVE WARNING LIGHT NOT WORKING

With the ignition ON, the fuel reserve warning light does not come on when the tank is at the reserve level

the fuel level message is supplied by the 'body computer node' and is made available to the 'instrument panel node' via the B-CAN.

the 'body computer node' also sends the fuel level sensor error message.

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the Examiner to the diagnostic socket Check that there are no faults in the Body Computer	Continue to Step 2	Sensor with broken circuit, sensor short circuited, value inconsistent/implausible in relation to actual fuel level.	Continue according to the instructions for the diagnostic equipment
2	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Keeping the Examiner connected to the diagnostic socket, check the operation of the fuel reserve warning light in active diagnosis	Continue to Step 3	The warning light does not come on	Replace instrument panel Op. 5560B11
3	FUEL LEVEL SENSOR CHECK	All OK	Problems met	Operation
	Check the operation of the fuel level sensor.	Continue to Step 4	Sensor not working	Replace the fuel pump assembly Op. 1040A70
4	ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check the continuity of the cable between the fuel level sensor, the Body Computer and the instrument panel See E4010 INSTRUMENT PANEL	Continue to Step 5	Cables broken/not insulated	Restore the cable continuity/insulation See E4010 INSTRUMENT PANEL
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace the Body Computer Op. 5505A32

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