K137 VEHICLE PROTECTION SYSTEM WARNING LIGHT ON CONSTANTLY - Alfa - 159 - eLearn

939003677 - K137 VEHICLE PROTECTION SYSTEM WARNING LIGHT ON CONSTANTLY

The Engine Control Node sends a message via the C-CAN network to the Body Computer, which makes it available via the B-CAN network, 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

1	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the eobd warning light is on at the same time as the vehicle protection warning light. In this case, check: Possible incorrect key code Fault in engine control node CAN line inactive	Move on to Step 2	1. Both warning lights on due to an incorrect immocode fault	1. Move on to Step 2
			2. Engine Control Node inactive and/or incorrect	2. Identify the inactive control units on the network
			3. Fault on CAN network	3. Move on to Step 9
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner connected to the Teg Reader node, check for faults in the key recognition device system.In active diagnostic mode, check the ignition key is enabled and recognised.	Move on to Step 3	1. Key recognition device faulty	1.Replace the key recognition device
		Move on to Step 3	2. Ignition key with defective/incorrect transponder	2. Restore the operation of the ignition key
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. 5505A32 BODY COMPUTER - R.R
5	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner diagnostic equipment check, in Instrument Panel mode, that there are no errors and that the parameters are present.	Move on to Step 6	1. System fault	1. Move on to Step 6
			2. Fault on CAN network	2. Move on to Step 13
			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 Instrument Panel Node mode, check that the vehicle protection warning light is correctly activated in Active Diagnosis.	Move on to Step 9	The warning light does not flash	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
9	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the diagnostic instrument connected, check the Engine Control Node for the absence of: System/component faults Faults in the CAN network/s	Move on to Step 12	1. System/components faulty	1. Move on to Step 10
			2. Fault on CAN network	2. Move on to Step 13
			3. Presence of errors	3. Continue following the instructions for the diagnostic equipment
10	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 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 USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Engine Control Node mode, that there are no errors and that the parameters are present.	Move on to Step 12	Fault persists	Replace the Engine Management Control Unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
12	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in Engine Control Node mode, check that the vehicle protection warning light is correctly activated in Active Diagnosis.	Move on to Step 13	The warning light does not flash	Replace the Engine Management Control Unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
11	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Engine Control Node mode, that there are no errors and that the parameters are present.	Move on to Step 12	Fault persists	Replace the Engine Management Control Unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
12		ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in Engine Control Node mode, check that the vehicle protection warning light is correctly activated in Active Diagnosis.	Move on to Step 13	The warning light does not flash	Replace the Engine Management Control Unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
13	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the node power supply/electrical connections are correct. Check the (network) wiring between Engine Control, Body Computer and Instrument Panel. Check, in particular, that each individual pin is correctly connected to each node.	Move on to Step 14	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 14	2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
14	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis