K123 WATER IN DIESEL FILTER WARNING LIGHT ON CONSTANTLY - Fiat - IDEA - eLearn

2398856 - K123 WATER IN DIESEL FILTER WARNING LIGHT ON CONSTANTLY

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

Any faults in the C-CAN light up the control unit warning lights which communicate on this network. The CAN information check is designed precisely for this purpose

1	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Connect the Examiner diagnostic equipment and check for the following at the CAN Information: 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
			Engine Managment node not activated and/or faulty	Continue to Step 9
			Presence of faults in the CAN	Continue to Step 13
2	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, the possibility of connecting with the Body Computer Node and that there are no errors and 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 to Step 6
3	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the electrical supply for the Body Computer Node is correct and check the wiring between the nodes, in particular that each individual pin is correctly connected	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. 5505A32
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 faulty	Continue to Step 6
			Presence of faults in the CAN	Continue to Step 13
			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	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. 5560B11
8	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the warning light in question is correctly activated	Continue to Step 9	The warning light in question does not flash	Replace the instrument panel Op. 5560B11
9	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Keeping the diagnostic equipment connected, check for the following at the Engine Management Node: System/component faults CAN faults	Continue to Step 12	System/component faults	Continue to Step 10
			Presence of faults in the CAN	Continue to Step 13
			There are errors	Continue as instructed by the tester
10	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 NCM, in particular that each individual pin is correctly connected	Continue to Step 11	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 11	Electrical connections not working	Restore the correct operation of the wiring
11	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Engine Management Node ambient, that there are no errors and the following parameters are present	Continue to Step 9	Fault persists	Replace the Engine Management Node Op. 1060G80
12	CHECK WITH ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	Using the Examiner in the Engine Management Node ambient, check, in active diagnosis, that the water presence warning light is correctly activated.	Continue to Step 6	The warning light does not flash	Replace the Engine Management Node Op. 1060G80
13	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the supply / electrical connection(s) for the node(s) is correct. 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 faulty	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 damaged wiring
14	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Continue to Step 1