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 | ||||
| 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 | |
| Impossible to connect with the control unit. | Continue to Step 5 | |||
| Impossible to connect with the control unit. | Continue to Step 8 | |||
| 2 | ELECTRICAL 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). | |
| Positive and/or earth electrical power supply fault. | 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. 4110D40 | |
| 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:
| Continue to Step 6 | Error 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 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:
| 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(s) 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:
| Continue to Step 10 | Services battery voltage faulty | Restore correct battery operation. | |
| 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 | |
| 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:
| 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:
| Continue to Step 13 | Wiring faulty. | Restore the correct operation of the wiring | |
| 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 | |
| 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 | |
| There are errors. | Continue according to the instructions for the diagnostic equipment. | |||
| 15 | ELECTRICAL 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 connections. | |
| 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 | |
| There are errors. | Continue according to the instructions for the diagnostic equipment | |||
| 19 | ELECTRICAL 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 connections. | |
| 21 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Using the Examiner, check whether it is possible to connect with the Instrument Panel Node. | Continue to Step 17 | Impossible to connect with the Instrument Panel control unit. | Replace the Instrument Panel Node control unit Op. 5560B11 | |
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