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oil light doesnt come on under self test (ie ever) TD42
Posted: Wed Feb 17, 2010 9:07 pm
by rumpig89
i have recently noticed that my oil light never comes on under self test when starting car.. that is it never works.
I have checked the bulb and it is all good, placed a test lead between neg side of bulb on circuit board and car frame and bulb glows dimly.. therefore ok.
where to look next?? should i be investigating a sensor, plug etc??
Dont have a wiring diagram at the moment - if someone could post a pic of that section of their manual??
its a TD42 turbo for what its worth. 88 Maverick
cheers
Posted: Wed Feb 17, 2010 10:41 pm
by its aford not a nissan
its most likley the pressure sender next to the oil filters , i would measure resistance here ,if you have an oil pressure guage in the dash cluster then it will have 2 wires comming out , yellow for the pressure guage and black for the light
Posted: Wed Feb 17, 2010 11:06 pm
by rumpig89
measure resistance from each wire to ground (negative)??
ill check it at the plug. When the car isnt running i would expect a low resistance from the black to neg?...ie it earths causing the light to glow?
do u know what range (ohms) the cluster should operate over (full scale)??
i have noticed that the oil pressure 'appeared' slack... kind of assumed that it was the sender but thought it should make the light come on not stay off. ill get some reading when it stops raining.
cheers
Posted: Thu Feb 18, 2010 6:38 am
by its aford not a nissan
the black wire should be a dead short to earth when the motor is off ( oil light )
the yellow wire should have no resistance with the motor off and have increasing resistance up to a dead short to earth at about 90- 100 psi
these commonly fail and aftermarket ones dont seem to last or work at all , genuine ones from nissan are around 130 ish bucks from nissan and should last another 15 odd years
Posted: Thu Feb 18, 2010 5:35 pm
by rumpig89
the yellow wire should have no resistance with the motor off and have increasing resistance up to a dead short to earth at about 90- 100 psi
should that be increasing resistance up to 'open circuit' to earth?? or does it should it acually start at 0, increase with pressure increase, until a point at 90-100 when it drops straight to zero?
cheers for the info. looks like ill prob be gettin a new one[/b]
oil lt
Posted: Thu Feb 18, 2010 5:51 pm
by madman89
yeah x2 on thinking it may be the pressure sender foz. i think damo just had exactly the same problem and is put in a new sender this week some time. ill chase it up ay.
Posted: Thu Feb 18, 2010 11:58 pm
by rumpig89
yeh cheers got me workshop manual cd back this arvo and tested me guages, proved it is the sender thats a bit shagged and found all the wires i need to splice into for cruise control... manuals are well worth the 4 bucks off ebay...
Posted: Fri Feb 19, 2010 10:26 am
by BIG GQ
Posted: Sun Feb 21, 2010 10:43 pm
by rumpig89
yeh think ive downloaded it before too. is it the nissan one? not that it prob makes a bit of difference.