ucb Posted June 12, 2023 Share Posted June 12, 2023 A1 dci 2014 power steering fault light on at start-up. Typically, when the car has been stood for a few days at start up the power steering light comes on. After maybe 1 or 2 mins at idle the light goes out and power steering is restored. Typical voltage readings that apply are Battery voltage at switch on there was no fault Battery charges to 14.7 Switch off - battery drops to after a rest period 12.7 engine off and full lights 12.2 recovers after a period to 12.4 A few days later:- at 12 degrees 12.4 Cranking 9.9 Then charging quickly to to 14+ still no fault After 7 days 11/6/22023 Temp 18.5 ignition off voltage 12.32 ignition on 12.05 warning light on Cranking 10 ish seconds after start 14.6 warning light out after about a minute steering ok idle voltage after 2 mins 14.7 switch off and after 5 mins battery volts at 12.86 I ready some say it is due to a poor battery which may be but if the pump's specification for operating voltage is a nominal 12volts then I would expect the operation parameters be up to 15volts ( ie maximum charge from the alternator) and so taking the lower operational voltage to be a similar figure down to 9/10volts. Any help with this one please and maybe some one has a wiring diagram to also indicate the cable terminal point? Many thanks Quote Link to comment Share on other sites More sharing options...
Magnet Posted June 12, 2023 Share Posted June 12, 2023 Keeping it simple Bri, it sounds as if the battery has done its time. It’s voltage under load is the important parameter. Note - down to less than 10v at cranking. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
ucb Posted June 18, 2023 Author Share Posted June 18, 2023 On 6/12/2023 at 7:49 PM, Magnet said: Keeping it simple Bri, it sounds as if the battery has done its time. It’s voltage under load is the important parameter. Note - down to less than 10v at cranking. Kind regards, Gareth. Gareth Many thanks for your reply. Yes, battery may well turn out to be the issue but If the rated voltage for this unit is 12v and it must be capable of 15v to cover for a "charging" cycle" is it possible that its lower end spec would be 9v ie operating voltage spec 12v+/- 3v. And so it should not "fault" out at 9v ? Also if the battery is low why do other components not fault out? Battery may be cheaper than the pump? Bri Quote Link to comment Share on other sites More sharing options...
Magnet Posted June 18, 2023 Share Posted June 18, 2023 Bri, where does your stated 12v +/- 3 volts come from? Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
ucb Posted June 19, 2023 Author Share Posted June 19, 2023 Gareth Rule of thumb ish. The vehicle supply is a nominal 12v, if all is well a resting battery should be 12.8v. The charging system should quickly go to 14.5 ish to maybe 15v and then be controlled by a volts regulator. And so I expect that the steering pump will be cable of 15v at least and if it will handle (by specification) a plus 3v increment it would also handle a 3v down below the nominal 12v to 9v. I havent been able to get a full manufacturers spec on the pump, its all based on "general" practices. Quote Link to comment Share on other sites More sharing options...
Magnet Posted June 19, 2023 Share Posted June 19, 2023 Hello Bri, To say it as I see it the +/- tolerance is correct only on the plus side, and I think your minus tolerance belief is based only on your assumption. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
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