22 · Diagnostics

Fuel reserve warning light on constantly

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Instrument panel › Fuel reserve warning light on constantly

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Fault diagnosisFuel reserve warning light on constantly

FUEL RESERVE WARNING LIGHT ON CONSTANTLY

2.0 JTS, 3.2 V6, 1.9 JTD 16V

The Engine Management Node sends the message via the C-CAN to the Body Computer which makes it available to the Instrument Panel Node via the B-CAN.

Warning: Any problems on the C-CAN cause the warning lights for the control units which communicate on this network to light up. The CAN information check is designed precisely for this purpose

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the fuel level gauge signal is not in the reserve condition	Continue to Step 1	Fuel level gauge in reserve condition	Restore the correct level
1	PRELIMINARY CHECKS	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment and check for the following at the CAN: Node(s) not activated Node(s) faulty Node(s) with CAN error	Continue to Step 6	Impossible to converse with the Body Computer	Continue to Step 2
			Instrument Panel Node not activated and/or faulty	Continue to Step 5
			Presence of faults in the CAN network	Continue to Step 9
2	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check the possibility of connecting with the Body Computer Node, that there are no errors and that the following parameters are present	Continue to Step 1	Impossible to connect with the Body Computer control unit	Continue to Step 3
		Continue to Step 1	There are errors	Continue according to the instructions for the diagnostic equipment
3	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the electrical power supply for the Body Computer Node is correct and that the wiring between the nodes is correct, in particular that each individual pin is correctly connected See See E4010 INSTRUMENT PANEL	Continue to Step 4	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 4	Electrical connections not working	Restore the correct operation of the wiring
4	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check the possibility of connecting with the Body Computer Node	Continue to Step 2	Impossible to connect with the Body Computer	Replace the Body Computer Op. Op. 5505A32 BODY COMPUTER - R R
5	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present.	Continue to Step 8	System fault	Continue to Step 6
			Presence of faults in the CAN network	Continue to Step 9
			There are errors	Continue according to the instructions for the diagnostic equipment
6	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the node electrical power supply is correct. Check the wiring between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected See See E4010 INSTRUMENT PANEL	Continue to Step 7	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 7	Electrical connections not working	Restore the correct operation of the wiring
7	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present.	Continue to Step 8	Fault persists	Replace the instrument panel Op. Op. 5560B11 ANALOGUE CONTROL PANEL - R+R OR REPLACE
8	CHECK WITH ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the reserve warning light is correctly activated	Continue to Step 9	The reserve warning light does not flash	Replace the instrument panel Op. Op. 5560B11 ANALOGUE CONTROL PANEL - R+R OR REPLACE
9	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the supply / electrical connections of the node(s). Check the (network) wiring between the Engine Management, Body Computer and Instrument Panel, in particular, that each individual pin is correctly connected at each node	Continue to Step 1	Positive and/or earth electrical power supply fault.	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 1	Electrical connections not working.	Restore the correct operation of the wiring
10	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 1

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Parts & tools for this job For 2003 Alfa Romeo GT

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