2398762 - H29 STEERING HEAVY WITH POOR RETURN

The Customer complains of the steering being heavy and/or poor response
Results of the tests
1TYRE CHECKAll OKProblems metOperation

Check the condition and wear of the front tyres, in particular:

  • Tyre inflation pressure.
  • One tyre is more worn than the other.
  • Tyres worn on the inside.
  • Tyres worn on the outside.
Continue to Step 2Tyre inflation pressure not correct. Restore the correct tyre inflation pressure.
One of the tyres worn more than the other, on the inside and/or on the outsideAdjust the steering geometry / toe in.
2STEERING HEAVINESS UNIFORMITY CHECKAll OKProblems metOperation
With the vehicle stationary and the engine not running, check that the heaviness of the steering does not vary from one end of travel position to the other.Continue to Step 3Excessive, constant hardening in both steering directions. Continue to Step 4
Heaviness only at some steering pointsContinue as instructed See table   H10  STEERING HARD
3STEERING HEAVINESS CHECKAll OKProblems metOperation

Check what type of steering rotation resistance is present, in the following order:

  • Vehicle stationary, ignition off.
  • Vehicle stationary, engine started.
  • Vehicle stationary with engine started using the city button
Continue to Step 9Excessive hardness when steering Continue to Step 4
The power assistance does not change from when the ignition is OFF to when the engine is started up. Continue as instructed See table   H30  ELECTRIC STEERING NOT WORKING
The power assistance does not change when the city button is pressed. Continue as instructed See table   K16  CITY WARNING LIGHT ON
4STEERING COLUMN CHECKAll OKProblems metOperation
Check the hardness of the steering column rotation after having disconnected it from the steering boxContinue to Step 5The electric steering column turns stiffly Continue to Step 6
The electric steering column turns freely.Continue as instructed See table   H29  STEERING HEAVY WITH POOR RETURN
5STEERING BOX CHECKAll OKProblems metOperation
After having disconnected the steering box from the electric steering column, manually move the front wheels and check the hardening of the steering box. Continue to Step 6Steering box faulty with possible rack hardening and/or tooth/teeth broken and/or bearing and/or pinion broken Continue as instructed See table   H29  STEERING HEAVY WITH POOR RETURN
6CHECK ON EXTENT OF FAULTSAll OKProblems metOperation
The hardness and/or return of the steering is even (the EPS system does not assist the return of the steering with the vehicle stationary): check the extent of the problem.Continue to Step 7The heaviness is extensiveReplace the EPS system Op. 4410D20
7CHECK ON EXTENT OF FAULTSAll OKProblems metOperation
Check that there are no impluses at the steering wheel when steering with the vehicle stationaryContinue to Step 9There are impulses coming from the steering wheelReplace the EPS system motor Op. 4410D30
8CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsContinue to Step 2