H26 NO ELECTRIC STEERING POWER ASSISTANCE WITH FAILURE WARNING LIGHT NOT ON - Lancia - MUSA - eLearn

184000436 - H26 NO ELECTRIC STEERING POWER ASSISTANCE WITH FAILURE WARNING LIGHT NOT ON

The Customer reports occasional hardening during the rotation of the steering wheel (no power assistance), without the failure warning light coming on

0	PRELIMINARY CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the system is not in autoprotection mode. If it overheated, the thermal protection system may have intervened.	Continue to Step 1	Thermal protection engaged	Wait for autorenewal and then carry out a fault diagnosis to exclude further faultsContinue to Step 1
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner diagnostic equipment and check, in the Parameters Reading ambient for the Electric Steering Node that there are no errors and the following parameters are present.	Continue to Step 10	Impossible to connect with the control unit.	Continue to Step 2
			Errors present.	Continue to Step 5
			Battery voltage parameter low	Continue to Step 8
2	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the electrical power supply for the Electric Steering Node is correct See E7045 ELECTRIC STEERING	Continue to Step 3	Positive and/or earth electrical power supply fault.	Replace the defective component (if a fuse is involved, search for the cause of the problem).
		Continue to Step 3	Battery voltage faulty	Continue to Step 8
3	CHECK ELECTRICAL CONNECTIONS	All OK	Problems met	Operation
	Check the electrical connections for the Electric Steering Node and the Body Computer, in particular that each pin is correctly connected and inserted in its housing.	Continue to Step 4	Electrical connections not working.	Restore damaged electrical connections.
4	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check the possibility of connecting with the Electric Steering Node.	Continue to Step 1	Impossible to connect with the control unit.	Replace the electric steering motor/control unit Op. 4410D40
5	ERRORS CHECK	All OK	Problems met	Operation
	Using the Examiner in the Electric Steering Node ambient, check whether one or more of the following errors is present: Internal and/or incorrect control unit error Steering column position/torque sensor error Electric motor relay error Services battery error	Continue to Step 6	Error detected inside the control unit.	Replace the Electric Steering control unit Op. 4410D40
			Steering column position/torque sensors faulty	Continue to Step 9
			Electric motor faulty	Continue to Step 12
			Power supply error detected.	Continue to Step 8
6	ERRORS CHECK	All OK	Problems met	Operation
	Check, using the Examiner in Electric Steering Node ambient, that the following errors are not permanent: CAN line and/or alternator and/or speed error. Failure warning light error	End of diagnosis	Intermittent error(s) detected	Continue to Step 7
			CAN faulty. and/or alternator faulty and/or vehicle speed error.	Continue to Step 14
			Failure warning light error detected.	Continue to Step 18
7	PRACTICAL CHECK	All OK	Problems met	Operation
	Delete the error(s0 and road test the vehicle checking that the fault does not reoccur See Test 4110A Electric steering operation check	End of diagnosis	The fault is present.	Continue to Step 1
8	BATTERY ELECTRICAL CHECKS	All OK	Problems met	Operation
	Check, in order: Correct battery voltage Leads correctly fastened to the battery See E7045 ELECTRIC STEERING	Continue to Step 10	Services battery voltage faulty	Restore correct battery operation.
		Continue to Step 10	Electric Steering Node power supply circuit loose connections.	Renew the wiring
9	CHECK WITH ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	With the Examiner in the Electric Steering Node ambient, check, in Active Diagnosis, that the system calibration is correctly activated	Continue to Step 11	The component in question is not activated.	Replace the Electric Steering Node control unit Op. 4110D40
		Continue to Step 11	The speed is not controlled by the active diagnosis.	Continue with the Engine Management Node fault diagnosis.
10	CHECK ELECTRICAL CONNECTIONS	All OK	Problems met	Operation
	Check the electrical connections for the Electric Steering Node, in particular making sure that each individual pin is correctly connected and inserted in its housing.	End of diagnosis	Electrical connections not working.	Restore damaged electrical connections.
11	CHECK WITH ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	With the Examiner in the Electric Steering Node ambient, check, in Active Diagnosis, that the function(s) in question is correctly activated: Calibration zeroing Position sensor calibration Force applied sensor calibration	Continue to Step 12	The component in question is not controlled by the active diagnosis	Replace the steering column
12	ELECTRIC STEERING COLUMN CHECK	All OK	Problems met	Operation
	Check, in order: Continuity of the wiring Operation See E7045 ELECTRIC STEERING	Continue to Step 13	Wiring faulty.	Restore the correct operation of the wiring
		Continue to Step 13	Sensor operation faulty	Replace the EPS system steering column
13	MECHANICAL CHECKS	All OK	Problems met	Operation
	Check the condition of the insulator (flexible coupling) between the electric motor and reduction unit	Continue to Step 23	The electric motor is damaged and/or broken	Replace EPS system electric motor Op. 4110D30
		Continue to Step 23	The flexible coupling is damaged and/or broken	Replace the EPS system flexible coupling.
14	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Body Computer Node ambient, that there are no errors and the following parameters are present.	End of diagnosis	Impossible to connect with the Body Computer control unit.	Continue to Step 15
		End of diagnosis	Errors present.	Continue according to the instructions for the diagnostic equipment
15	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the Body Computer Node electrical power supply is correct.	Continue to Step 16	Positive and/or earth electrical power supply fault.	Replace the defective component (if a fuse is involved, search for the cause of the problem).
16	CHECK ELECTRICAL CONNECTIONS	All OK	Problems met	Operation
	Check the electrical connections between the Electric Steering Node and the Body Computer Node, in particular that each individual pin is correctly connected and inserted in its housing.	Continue to Step 17	Electrical connections not working.	Restore damaged electrical connection.
17	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 13	Impossible to connect with the Body Computer control unit.	Replace the Body Computer Node Op. 5505A32
18	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 22	Impossible to connect with the Instrument Panel control unit	Continue to Step 19
		Continue to Step 22	Errors present.	Continue according to the instructions for the diagnostic equipment
19	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the Instrument Panel Node electrical power supply is correct.	Continue to Step 20	Positive and/or earth electrical power supply fault.	Replace the defective component (if a fuse is involved, search for the cause of the problem).
20	CHECK ELECTRICAL CONNECTIONS	All OK	Problems met	Operation
	Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected.	Continue to Step 21	Electrical connections not working.	Restore damaged electrical connection.
21	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation

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