A lot of modern car doesn't have oil pressure gauge to see how much pressure the oil pump is creating... how the computer or PCM knows when the oil pressure is dropping. Most people have good oil pressure because the low pressure warning light doesn't light up unless it's a big drop on oil pressure or not pressure at all.
So I did this test for continuity on my one pin unit and I get no continuity beep. I did however put one lead on the top terminal and one on the body. I depress d the plate inside and did see numbers change .
Does it mean that the oil sensor will close the circuit only in case of low pressure ? and never in case of too high pressure ? this means as well the ECU checks a close circuit first and then should go to an open circuit when the engine is running ?
Hi Tech. This pressure sensor is from a Triumph Spitfire. The car dates from the 60s to the 80s and did not have an ECU. The sensor was a pure switch. With no pressure (Engine off, ignition on) the switch was closed, and the current would flow and illuminate the light. And with oil pressure, when the engine is running, the switch would open, and the light would go out. I hope this helps?
Thank you for your comments. When the engine runs, the light goes out. When the engine runs, the oil pressure rises and separates the terminals..... this breaks the circuit and the light goes out. I hope this helps?
This particular pressure switch was from a triumph spitfire.... there would need to be a grounding strap attached from the engine mount to the chassis as the engine is normally mounted on rubber vibration absorbing material.
Very informative. My oil pressure switch is a 3 prong for a 78 Cadillac Coupe with the 425 carburetor engine. One wire feeds on end of switch, other end has wire leading to indicator light on the dash and the other is a wire to the choke heater on side of carburetor. There's no 12v power going to choke heater, but the fuse and the light work ok as it should...could it still be a bad oil pressure switch? According to service manual the electric choke receives an electric current operating thru the oil pressure switch whenever the engine running and it isn't. I suspect it's bad because at cold start up the engine would run a bit all the while idleling bad and stumbling then it'll cut off. However, once i get it going, i have no issues at all thru the course of the day. Engine runs perfectly fine. It only occurs during start up and cold weather. Any feedback is appreciated 👏 thanks
Ok, thanks. I made it in this way for simplicity. I have a full explanation of the actual wiring in this video: studio.ua-cam.com/users/videolatCgZ0bYes/edit I'd be interested to know what you think of the additional information?
@@halimdollah9720 ua-cam.com/video/latCgZ0bYes/v-deo.htmlsi=k-VoGvq0pnTSsl5V have a look at this extended video that I produced. It explains where the power comes from. Thanks for watching.
i like the simplicity of explanation, thank you.
Thank you.
A lot of modern car doesn't have oil pressure gauge to see how much pressure the oil pump is creating... how the computer or PCM knows when the oil pressure is dropping. Most people have good oil pressure because the low pressure warning light doesn't light up unless it's a big drop on oil pressure or not pressure at all.
perfect! Exactly what I was looking for.
Excellent explanation. Thank you.
Thank you for your kind words.
Thank you for conceptual illustration.
You are very welcome
Good explanation and visuals. Thanks
Thank you.
So I did this test for continuity on my one pin unit and I get no continuity beep. I did however put one lead on the top terminal and one on the body. I depress d the plate inside and did see numbers change .
Thanks for the feed back.
Sorry about the late reply....
Would a faulty one of these cause high pressure in the fuel system ?
Cleared my head now ! Thanks
Glad it helped!
Possitive line is directly connected to the warning light?
ua-cam.com/video/latCgZ0bYes/v-deo.html Have a look at my other video, it explains this issue. Thanks for watching.
Thanks for this Neil
Does it mean that the oil sensor will close the circuit only in case of low pressure ? and never in case of too high pressure ? this means as well the ECU checks a close circuit first and then should go to an open circuit when the engine is running ?
Hi Tech. This pressure sensor is from a Triumph Spitfire. The car dates from the 60s to the 80s and did not have an ECU. The sensor was a pure switch. With no pressure (Engine off, ignition on) the switch was closed, and the current would flow and illuminate the light. And with oil pressure, when the engine is running, the switch would open, and the light would go out. I hope this helps?
is there any difference in the construction of the switch for units with 2 or 3 spades?
I've only come across the Oil Px Sx with one terminal. Sorry.
Excellent! So useful!
Thank you for the kind comments Hayley.
Great presentation. So when the engine runs the light should come on or off?
Thank you for your comments. When the engine runs, the light goes out. When the engine runs, the oil pressure rises and separates the terminals..... this breaks the circuit and the light goes out. I hope this helps?
Excellent!
Thank you so much!
You are welcome!
Can the light be grounded wherever on the bike?
This particular pressure switch was from a triumph spitfire.... there would need to be a grounding strap attached from the engine mount to the chassis as the engine is normally mounted on rubber vibration absorbing material.
What is name of this particular oil pressure switch ?
@@ajmalkhan9062 sorry I don't know that one.
Perfect explanation!!! Thnx
Thank you. I'm glad you found it interesting.
thats amazing thank you so much, you just had help aman from behing the seas.
You're very welcome!
This is why I love the internet
really good. thanks
Thank you too! I'm glad you found it useful.
Very nice.
Sorry about the late replay and thank you for the feed back.
good presentation that
Thank you for the kind comment's.
Awesome thanks
No problem!
Very informative. My oil pressure switch is a 3 prong for a 78 Cadillac Coupe with the 425 carburetor engine. One wire feeds on end of switch, other end has wire leading to indicator light on the dash and the other is a wire to the choke heater on side of carburetor. There's no 12v power going to choke heater, but the fuse and the light work ok as it should...could it still be a bad oil pressure switch? According to service manual the electric choke receives an electric current operating thru the oil pressure switch whenever the engine running and it isn't. I suspect it's bad because at cold start up the engine would run a bit all the while idleling bad and stumbling then it'll cut off. However, once i get it going, i have no issues at all thru the course of the day. Engine runs perfectly fine. It only occurs during start up and cold weather. Any feedback is appreciated 👏 thanks
Sorry about the late reply Edgar. Also I'm not familiar with this system..... sorry.
@@Madeinwem I got it fixed and sorted out. Thanks for the reply.
Good video / explanation, but as someone else has pointed out electrically I’m pretty sure it’s not correct.
Ok, thanks. I made it in this way for simplicity. I have a full explanation of the actual wiring in this video: studio.ua-cam.com/users/videolatCgZ0bYes/edit I'd be interested to know what you think of the additional information?
It seems as if you're missing something. Electricity! You need to get some power in there to make the whole thing work.
Try this one..... ua-cam.com/video/latCgZ0bYes/v-deo.html
think your wiring diagram is so wrong lol
Thanks for your comment. I'm open to any improvements?
@@Madeinwem well positive goes in to the lamp and out of the lamp to the sender , them the switch makes contact to earth which completes the circuit
@@rsm_me171 Thanks for your comment.
No power supply, the bulb got supply from where😅😅😅😅😂😂😂
@@halimdollah9720 ua-cam.com/video/latCgZ0bYes/v-deo.htmlsi=k-VoGvq0pnTSsl5V have a look at this extended video that I produced. It explains where the power comes from. Thanks for watching.