Fuel reserve warning light on (with higher level)

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Instrument panel › Fuel reserve warning light on (with higher level)

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Fault diagnosisFuel reserve warning light on (with higher level)

FUEL RESERVE WARNING LIGHT ON (WITH HIGHER LEVEL)

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

Faults in the C-CAN network will turn on the warning lights of the control units that communicate on this network. Verification of the CAN Network Information is intended to detect this situation

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fuel level gauge reading is not in the reserve condition	Move on to Step 1	Fuel level gauge on reserve	Top up the fuel to the correct level.
1	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect an Examiner and check on CAN Network Information for the absence of: Inactive node/s Node/s with error/s Node/s with CAN network error/s	Move on to Step 6	1. Impossible to communicate with the Body Computer	1. Move on to Step 3
			2. Instrument Panel Node inactive and/or with error	2. Move on to Step 5
			3. Fault on CAN network	3. Move on to Step 10
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, using the Examiner, that it is possible to connect with the Body Computer Node, that there are no errors and that the following parameters are present.	Move on to Step 3	1. Impossible to connect to the Body Computer control unit.	1. Move on to Step 3.
		Move on to Step 3	2. Presence of errors	2. Continue as described by the diagnostic equipment
3	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the power supply to the Body Compute Node is correct and the wiring between the nodes. Check in particular that each individual pin is correctly connected.	Move on to Step 4	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
		Move on to Step 4	2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Use an Examiner to check the possibility of connection to the Body Computer Node	Move on to Step 5	Impossible to connect to the Body Computer.	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
5	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present.	Move on to Step 8	1. System fault	1. Move on to Step 6
			2. Fault on CAN network	2. Move on to Step 8
			3. Presence of errors.	3. Continue as described by the diagnostic equipment
6	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electricity supply to the node is correct. Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected.	Move on to Step 7	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
		Move on to Step 7	2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
7	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present.	Move on to Step 8	Fault persists	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
8	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in the Instrument Panel Node ambient check that the fuel reserve warning light is correctly activated in Active Diagnosis	Move on to Step 9	The reserve warning light does not flash	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
9	FUEL LEVEL GAUGE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the level gauge is working properly See Test 1040AC FUEL LEVEL GAUGE CHECK	Move on to Step 10	Level gauge defective	Change the level gauge Op. 1040A70 SUBMERGED PUMP ASSEMBLY COMPLETE WITH LEVEL GAUGE CONTROL - R + R
10	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the power supply / electrical connection(s) for the node(s) is/are correct. Check the (network) wiring between the Body Computer and Instrument Panel, in particular that each pin is correctly connected at each node	Move on to Step 11	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
		Move on to Step 11	2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
11	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2005 Fiat Croma

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