Scangauges and ECU

Submitted: Friday, May 02, 2014 at 19:17
ThreadID: 107587 Views:1948 Replies:3 FollowUps:3
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I have a PX Ranger with a Scan Gauge and just wondering if anybody else have noticed it light up when the keys have not been in for 12 hour, sitting in garage un locked. It would explain why the battery can read as low as 11.43v at battery in mornings. This must happen often to drain battery like this. Is this common to other makes and what checks would the ECU be making intermitinly.


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Reply By: Matthew G3 - Friday, May 02, 2014 at 19:41

Friday, May 02, 2014 at 19:41
Stupid me it's a PJ 08 still dreaming
AnswerID: 531698

Follow Up By: Slow one - Saturday, May 03, 2014 at 07:58

Saturday, May 03, 2014 at 07:58
Mate, join the new ranger forum. Down the lower half of the forum page there is a PJ RK Ranger heading. Post your question there and see if you get a response.

Ranger forum

FollowupID: 814779

Reply By: Ross M - Friday, May 02, 2014 at 21:33

Friday, May 02, 2014 at 21:33
Is it possible the remote has been operated before you get to the vehicle, that will sometimes turn the ScanGauge on.

Are there any other devices connected to the vehicle which appear to be dormant but do use some power. ie Fridge

As a test, I would unplug the Scan and see if it still does the same thing. Possibly it is something else causing it.
AnswerID: 531705

Follow Up By: Member - Rosco from way back - Friday, May 02, 2014 at 23:06

Friday, May 02, 2014 at 23:06
Interesting comment Ross. I have been having some charge problems with the aux batt, which have since hopefully been resolved.

However .......... I did note, when in the midst of same and with a flat batt, that even after turning the Waeco 50l off (but still connected to power), the low voltage warning light was blinking, indicating that even in the off state, it was still monitoring voltage and as such, must be consuming power. I shall consider pulling the plug in future.
FollowupID: 814770

Follow Up By: Ross M - Saturday, May 03, 2014 at 18:50

Saturday, May 03, 2014 at 18:50
That indicates the OFF switch isn't really an off switch at all, if voltage monitoring remains active.

Since many electronic stuff has an electronic "Toggle" action to change it's state from ON to OFF or OFF to ON, then it is possible a small voltage fluctuation may toggle the switched state of some auxiliary items like scan gauge and make it switch on.
I know in a Dmax, sometimes, not always, when the key unlock is activated the ScanGauge lights up and the only situation which changed is the central locking was operated. Mine does exactly that, sometimes.

Any fridge, on off, or some vehicle systems periodic electronic check pulse may also possibly activate the scan Gauge.
On board cameras toggle, (switch on) when the power is connected ie key on.
FollowupID: 814861

Reply By: John and Regina M - Friday, May 02, 2014 at 23:27

Friday, May 02, 2014 at 23:27
Do you lock the car overnight?
AnswerID: 531711

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