K123 WATER IN DIESEL FILTER WARNING LIGHT ON CONSTANTLY - Alfa - 159 - eLearn

939003671 - K123 WATER IN DIESEL FILTER WARNING LIGHT ON CONSTANTLY

The Engine Control 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 will turn on the warning lights of the control units that communicate on this network. Verification of the CAN Information is intended to detect this situation

1	CHECK ON SENSOR FOR PRESENCE OF WATER IN DIESEL FILTER	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for presence of water in diesel filterCheck that the sensor supply is correctCheck the operation of the sensor	Move on to Step 2	1. Water in the filter	1. Replace the filter and refill with diesel that conforms to the specifications
			2. Supply not correct	2. Restore correct power supply
			3. Sensor defective	3. Replace the filter mounting and sensor Op. 1060G30 WATER PRESENCE SENSOR IN FUEL FILTER - R.R.
2	CHECKS USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic instrument and check CAN 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 4
			2.Instrument Panel Node inactive and/or with error	2. Move on to Step 7
			3. Engine Control Node inactive and/or with error	3.Move on step 11
			4. Fault in CAN network	4.Continue as instructed by the diagnostic equipment
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Use an Examiner to asses the possibility of connection to the Body Computer Node, the lack of errors and the presence of parameters.	Move on to Step 3	1. Impossible to connect to the Body Computer control unit.	1. Move on to Step 4
		Move on to Step 3	2. Presence of errors	2. Continue as described by the diagnostic equipment
4	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the power supply to the Body Computer Node and the wiring between the nodes are correct . 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.
5	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 2	Impossible to connect to the Body Computer.	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R
6	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 7
			2. Fault on CAN network	2. Move on to Step 14
			3. Presence of errors	. Continue as described by the diagnostic equipment
7	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.
8	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
9	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in Instrument Panel Node mode, check that the warning light in question is correctly activated in Active Diagnosis.	Move on to Step 9	The warning light in question does not flash	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
10	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic instrument connected, check the Engine Management Node for the absence of: System/component faults Faults in the CAN network/s	Move on to Step 11	1.System/components faulty	1.Move on to step 11
			2. Fault in CAN network	2.Move on to Step 13
			3.Presence of errors	3.Continue following the instructions for the diagnostic equipment
11	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 NCM. In particular, check that each individual pin is properly connected	Move on to Step 12	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 12	2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
12	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Engine Management Node mode, that there are no errors and that the parameters are present.	Move on to Step 13	Fault persists	Replace the Engine Management Control Unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
13	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in Engine Control Node mode, check that the water presence warning light is correctly activated in Active Diagnosis.	Move on to Step 14	The warning light does not flash	Replace the Engine Management Control Unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
14	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the node power supply/electrical connections are correct. Check the (network) wiring between Engine Management, Body Computer and Instrument Panel. Check, in particular, that each individual pin is correctly connected to each node.	Move on to Step 15	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 15	2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
15	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis