2751039 - H25 NO ELECTRIC STEERING POWER ASSISTANCE WITH FAILURE WARNING LIGHT NOT ON

The Customer reports that it is not working properly (steering hard) and/or the failure warning light is on
Results of the tests
1CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
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 10Impossible to connect with the control unit.Continue to Step 2
Impossible to connect with the control unit.Continue to Step 5
Impossible to connect with the control unit.Continue to Step 8
2ELECTRICAL POWER SUPPLY CHECKAll OKProblems metOperation
Check that the electrical power supply for the Electric Steering Node is correct See   E7045  ELECTRIC STEERING Continue to Step 3Positive and/or earth electrical power supply fault. Replace the defective component (if a fuse is involved, search for the cause of the problem).
Positive and/or earth electrical power supply fault. Continue to Step 8
3CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
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 4Electrical connections not working.Restore damaged electrical connections.
4CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Electric Steering Node. Continue to Step 1Impossible to connect with the control unit.Replace the electric steering motor/control unit Op. 4110D40
5ERRORS CHECKAll OKProblems metOperation

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 6Error detected inside the control unit. Replace the Electric Steering control unit Op. 4110D40
Steering column position/torque sensors faulty Continue to Step 9
Electric motor faultyContinue to Step 12
Power supply error detected. Continue to Step 8
6ERRORS CHECKAll OKProblems metOperation

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 diagnosisIntermittent error(s) detectedContinue to Step 7
CAN faulty and/or alternator faulty and/or vehicle speed errorContinue to Step 14
Failure warning light error detected.Continue to Step 18
7PRACTICAL CHECKAll OKProblems metOperation
Delete the error(s) and road test the vehicle checking that the fault does not reoccur See Test   4110A  Electric steering operation check End of diagnosisThe fault is present.Continue to Step 1
8BATTERY ELECTRICAL CHECKSAll OKProblems metOperation

Check, in order:

Continue to Step 10Services battery voltage faulty Restore correct battery operation.
Electric Steering Node power supply circuit loose connections.Renew the wiring
9CHECK WITH ACTIVE DIAGNOSISAll OKProblems metOperation
With the Examiner in the Electric Steering Node ambient, check, in Active Diagnosis, that the system calibration is correctly activatedContinue to Step 11The component in question is not activated. Replace the Electric Steering Node control unit Op. 4110D40
The speed is not controlled by the active diagnosis. Continue with the Engine Management Node fault diagnosis.
10CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
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 diagnosisElectrical connections not working.Restore damaged electrical connections.
11CHECK WITH ACTIVE DIAGNOSISAll OKProblems metOperation

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 12The component in question is not controlled by the active diagnosis Replace the steering column
12ELECTRIC STEERING COLUMN CHECKAll OKProblems metOperation

Check, in order:

Continue to Step 13Wiring faulty. Restore the correct operation of the wiring
Sensor operation faulty.Replace the EPS system steering column
13MECHANICAL CHECKSAll OKProblems metOperation
Check the condition of the insulator (flexible coupling) between the electric motor and reduction unitContinue to Step 23The electric motor is damaged and/or broken. Replace EPS system electric motor Op. 4110D30
The flexible coupling is damaged and/or brokenReplace the EPS system flexible coupling.
14CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner check, in the Body Computer Node ambient, that there are no errors and the following parameters are present.End of diagnosisImpossible to connect with the Body Computer control unit.Continue to Step 15
There are errors. Continue according to the instructions for the diagnostic equipment.
15ELECTRICAL POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Body Computer Node electrical power supply is correct. Continue to Step 16Positive and/or earth electrical power supply fault. Replace the defective component (if a fuse is involved, search for the cause of the problem).
16CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
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 17Electrical connections not working.Restore damaged electrical connections.
17CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Body Computer Node. Continue to Step 13Impossible to connect with the Body Computer control unit.Replace the Body Computer Node Op.   5505A32 
18CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present. Continue to Step 22Impossible to connect with the Instrument Panel control unitContinue to Step 19
There are errors. Continue according to the instructions for the diagnostic equipment
19ELECTRICAL POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Instrument Panel Node electrical power supply is correct. Continue to Step 20Positive and/or earth electrical power supply fault. Replace the defective component (if a fuse is involved, search for the cause of the problem).
20CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected. Continue to Step 21Electrical connections not working.Restore damaged electrical connections.
21CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check whether it is possible to connect with the Instrument Panel Node. Continue to Step 17Impossible to connect with the Instrument Panel control unit.Replace the Instrument Panel Node control unit Op. 5560B11
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