VS commodore Fuel pump draining 0.74a
hey all seems odd to me any help would be appreciated
Car off fuel pump fuse in 0.97a - 0.98a
car off fuel pump fuse out 0.13a - 0.14a
is this normal ?
My car seems to get a flat battery after two days its a new battery 2 weeks old been a problem for a while now checked the multimeter and these were the only results i found that reduced the 0.97a draw when the car is turned off
Donating Member
I'd say it ain't normal. Check what else is on that circuit....at a first guess I'd say the oil pressure warning switch although normally this just shorts and blows the fuse. Have you checked it in the dark of night - look for light!
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
wouldnt the oil pressure switch cause a error code i get code 12 which is all good , its the fuel pump fuse in the engine bay that i removed its the only thing it fuses i beleive
The BCM (Body Control Module) is also on the circuit.
All electrical circuits in the car pass through this module, & if there is an issue with this module it will continue to draw power.
if you are still having trouble with this circuit you will need to test this by using a second BCM. however you will need the key (remote head) that is programed to match the second BCM.
if you still have the current draw it will not be the BCM but I think you will find that it will solve the problem.
Unfortunately it can be an expensive fix, but if you can borrow the bcm from another VR/VS that would be better.
i Hope that Helps.
Last edited by BottleFedVS; 17-07-2010 at 11:14 PM. Reason: sh*#^y spelling
on holiday
you will never have 0.00 current draw ecu is allways sucking power so is other stuff. ide unplug the oil pressure switch and see if the extra drain goes awaythough .
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
where is the oil pressure switch located
whats the light got to do at night with the pressure switch just have the bonnet open and someelse cranking the car and see if it lights up ?
operation HQ under way.
there is a know issue that a few members on this forum have had. its to do with the bcm and the auto light feature. if you leave the headlight switch on and you open the door the lights go out (normal) but for some reason the lights come back on later on say 2am or something silly. my vr berlina (high bcm) has done this once and since than (and doing some googlein manly finding jc threads) i never leave the lights on.
Originally Posted by Adam Savage (mythbusters)
nargh my headlights dont stay on they always turn off when the door is opened but they have never turned on by themselves yet .....
Donating Member
What I mean't by looking at night for light means looking to see if the glovebox light or the bootlight is staying on....you can't see them in daylight ! Also the oil pressure switch is directly in front of the oil filter facing forward - has an electrical connector to it. To isolate it simply pull the connector off and see if you still have drain.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
argh got ya that makes more sence ill check later cheers
The Wagon on Wheels..
I thought the fuel pump fuse went straight to the fuel pump??? The purple wire yeah.
My thoughts is someone has mistakenly hooked somthing up to this thinking it just to be a standard Accesories wire. Eg: they did some testing to find a acc wire and just stumbled on this one and used it.
Is there anything non standard hooked in that might be causing this?
It's cheap and half arsed - perfect fit for a Commodore
Reaper
Donating Member
Apparently the oil pressure switch powers the fuel pump once the engine oil pressure is up - it's a safety thing so that if the engine stops in a prang/rollover, oil pressure will drop and power to the pump is cut so you don't have fuel spraying everywhere and then....bang.
Yousay: Is there anything non standard hooked in that might be causing this?......aftermarket immobilisers can drain power so that's a good point.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
operation HQ under way.
why is it than when the oil light comes on the car dosent cut out? i drove my car around for a solid week with a faulty oil pressure sensor and i still had fuel pressure, i also disconnected the sensor and it still started, i haven't seen the diagram in a while but are they in series or parallel?
and what i was meaning about the lights if the switch was left in the on pos even tho the lights turn off with the door the bcm for some reason will draw current and flatten the battery. its happened to my car, and since i turn the light switch to off before leaving the car,i haven't had a flat battery in a while. it usually happens over night not a quick run in to the shops.
the circuit
but you need oil pressure if the fuel pump relay fails or computer takes feed off relay for the pump to keep working until you get home
If fuel pump relay is not energised ,12v can be fed from oil pressure switch (if engine has oil pressure)through contacts 87a and 30 of fuel pump relay to the fuel pump.....if ecm puts 12v on coil of fuel pump relay then 12v from fuse 23 feeds through contacts 87 and 30 of relay to fuel pump
Last edited by markovr; 19-07-2010 at 09:02 AM.
This is my vr that I rebuilt ....CLICK HERE to see my vr on Cardomain
......if you want to check it out......Anyway make sure you rubbish a ford daily ....I am a 4DH8RZ Club lifetime member .................new members joining everyday
i do have a aftermarket immobiliser that was installed by a coconut so maybe he has #$%^^&$# something =/
Donating Member
I'm not sure exactly how it works, but I'd guess that no oil pressure + no engine revolutions means the ECU cuts power to the fuel pump. This is indicated by when you first start the car, the ECU primes the fuel pump for about 2 seconds, engine starts and oil pressure builds and the oil pressure switch then powers the fuel pump. If the engine doesn't start and the ignition is still on, the fuel pump does not pump. Otherwise, the fuel pump would be running whenever the ignition is on and the engine stopped. The wiring diagram does not explain what parameters the ECU needs to supply power to the FP relay.
No oil pressure does not seem to cause the ECU to cut power, but no oil pressure plus no engine revs will cut the power.
Last edited by hako; 19-07-2010 at 09:25 PM. Reason: more
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
on holiday
the oil pressure switch is a backup circuit should the relay fail or the ecu goes into limp home mode means the fuel pump will run when oil pressure comes up from cranking so you can get home.
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
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