Steer­ing an­gle sen­sor

Car Mechanics (UK) - - Help! -

I read with in­ter­est the Elec­tronic Diagnostics ar­ti­cle on the Porsche Boxster in the Nov 2017 is­sue, in par­tic­u­lar the ref­er­ence to re­cal­i­bra­tion of the steer­ing an­gle sen­sor should the bat­tery go flat or be re­moved. I have a 2000 2.7 model with a flat bat­tery, but this is the first I’ve heard of this is­sue, as it’s not men­tioned in the hand­book and I’ve not no­ticed any­thing un­to­ward in the steer­ing or any other ve­hi­cle sys­tem af­ter re­plac­ing the bat­tery. Can you tell me what might be the con­se­quence of not car­ry­ing out the re­set? Can you rec­om­mend a suit­able di­ag­nos­tic tool to carry out this pro­ce­dure? Richard Carr

From the data I have, the need to re­set the steer­ing an­gle sen­sor only ap­plies to ve­hi­cles from 2005 on­wards. If the sen­sor does need re­cal­i­brat­ing, it should bring up a fault and the PSM in­di­ca­tor light in the in­stru­ment clus­ter will il­lu­mi­nate.

There is a method to re­cal­i­brate the sen­sor given in the Porsche man­ual, which is as fol­lows: 1) The steer­ing an­gle sen­sor can be reini­tialised af­ter the bat­tery has been dis­con­nected by turn­ing the wheels to the straight-ahead po­si­tion. 2) Switch the ig­ni­tion off and on again

twice, then start the en­gine. 3) From the straight-ahead po­si­tion, turn the steer­ing wheel ap­prox­i­mately 20° to the right, past the straigh­ta­head po­si­tion. 4) Drive the ve­hi­cle straight ahead for at least one sec­ond at a speed above 2.5mph. 5) The steer­ing an­gle sen­sor seg­ment should be recog­nised again dur­ing this process. Once the sen­sor has been suc­cess­fully ini­tialised, the fault code stored in the fault mem­ory is doc­u­mented us­ing the fault dele­tion counter, and the fault mem­ory erases it­self au­to­mat­i­cally. The PSM in­di­ca­tor light in the in­stru­ment clus­ter will go out.

The steer­ing an­gle sen­sor feeds in­for­ma­tion to the trac­tion con­trol sys­tem. If this is not cor­rectly cal­i­brated it can cause the ESP to pro­vide steer­ing in­put or ad­just­ments at the wrong time. This will give the steer­ing a loose feel and can be detri­men­tal to the han­dling of the ve­hi­cle.

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