Power steer­ing

Car Mechanics (UK) - - Help! -

For the past 12 months, the power steer­ing mal­func­tion tri­an­gle has been com­ing up in­ter­mit­tently on the dash of my 2012 Ford Kuga 2.0 diesel, then go­ing off again. I have had a di­ag­nos­tic check and there are no stored faults. Ac­cord­ing to the Ford fo­rum, other own­ers have the same fault, but no one has found a so­lu­tion. Brian Lloyd

The com­po­nent I would sus­pect first is the torque an­gle sen­sor, but this was not fit­ted to the Ford Kuga af­ter 2009 and its job is car­ried out by the steer­ing an­gle sen­sor in­cor­po­rated into the steer­ing col­umn switches.

Elec­tronic power steer­ing (EPS) sys­tems do in­cor­po­rate a wide range of com­po­nents and, un­for­tu­nately, fault codes are not al­ways set. I would start by check­ing that the fluid level in the reser­voir is cor­rect and that the elec­tri­cal con­nec­tions to the pump are clean and dry. The pump and reser­voir are found un­der the front off­side wing, be­hind the in­ner whee­larch, and this area is sus­cep­ti­ble to con­tam­i­na­tion from wa­ter throw up from the road.

You do not men­tion whether the steer­ing fails when the light is il­lu­mi­nated, which would sug­gests that the prob­lem may be with the in­for­ma­tion from the steer­ing an­gle sen­sor. You should be able to check the read­ings from the sen­sor us­ing di­ag­nos­tic equip­ment. I would also check if there’s a poor con­nec­tion to the steer­ing col­umn switches; Can­bus wiring sys­tems do rely on a good con­nec­tion to op­er­ate cor­rectly.

Fi­nally, one com­po­nent that could cause prob­lems is the bat­tery. Even though the ve­hi­cle may be start­ing with­out is­sue, if the bat­tery is be­gin­ning to fail then one of the first symp­toms is an in­ter­mit­tent elec­tri­cal com­po­nent mal­func­tion.

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