Oil temperature sensor specification

pooga · 27 Feb 2018

I am looking to take oil temperature sensor feed at the DME plug 3/pin 5 (i believe it is 0-5v) and build analog-to-digital converter using a microcontroller with a LCD display to display oil temperature.

I have put together the microcontroller using Arduino board with LCD display but now need to work out how to convert voltage from sensor to temperature - I believe its a NTC sensors so i am looking for the specification of these sensor to identify the coefficients that i can use with steinhart & hart equation to give me the temperature.

Any one know the manufacturer / model / specification of the sensor?

Oil temperature Porsche part no is 99660640501 and is the same as the coolant temperature sensor.

demon · 28 Feb 2018

Oil temp/level sensor is definitely different to the coolant temp sensor - I know various parts sites list the same part number in error - the Porsche parts catalogue should reveal the correct part number

...the coolant temp sensor is an inch or so long....

....the oil temp/level sensor looks like this (excuse the rotation!)......

stabs in through the "top" of the engine (on early cars it fouls the intake manifold, which needs to be removed for access)
i.e. don't investigate and attempt to draw it out, as you will likely damage it by leveraging on it sideways once you feel that you've raised it the couple of inches needed to remove (based on images of the coolant sensor).....

pooga · 28 Feb 2018

demon said:
Oil temp/level sensor is definitely different to the coolant temp sensor - I know various parts sites list the same part number in error - the Porsche parts catalogue should reveal the correct part number

...the coolant temp sensor is an inch or so long....

....the oil temp/level sensor looks like this (excuse the rotation!)......

stabs in through the "top" of the engine (on early cars it fouls the intake manifold, which needs to be removed for access)
i.e. don't investigate and attempt to draw it out, as you will likely damage it by leveraging on it sideways once you feel that you've raised it the couple of inches needed to remove (based on images of the coolant sensor).....

it's the oil temperature sensor specification i am after part 27 on the diagram.

just after the technical specification for the sensor if its available?

demon · 1 Mar 2018

the sensor you have circled is not an oil temp sensor - it is a coolant temp sensor - the right hand side of the structure it is screwed into is a water jacket

read the following article (fig.2 and fig.3) and look at the "parts for this project" shown to the right side of the page

https://www.pelicanparts.com/techar..._Sensors/26-FUEL-Replacing_Engine_Sensors.htm

bakerboy4s · 1 Mar 2018

My 2003 C4S has oil level and oil pressure output but not oil temperature, is there a fix/ mod for this?

pooga · 1 Mar 2018

demon said:
the sensor you have circled is not an oil temp sensor - it is a coolant temp sensor - the right hand side of the structure it is screwed into is a water jacket

read the following article (fig.2 and fig.3) and look at the "parts for this project" shown to the right side of the page

https://www.pelicanparts.com/techar..._Sensors/26-FUEL-Replacing_Engine_Sensors.htm

Thanks Damon - i understand now! some sites are showing 99660640501 as oil / coolant sensor!

The correct sensor is 996-606-150-01 (as you have have pointed out )

Anyone know if the sensor specification is available of this? (i am starting to think not!)

pooga · 1 Mar 2018

bakerboy4s said:
My 2003 C4S has oil level and oil pressure output but not oil temperature, is there a fix/ mod for this?

I have built a digital display for oil temperature - but I need the sensor specification to calibrate it.

bakerboy4s · 1 Mar 2018

Not knowing the temperature isn't an issue for me other than others say the oil takes about 15 mins to reach optimum temp for best circulation before letting her rip :lol:

sportsandclassic · 1 Mar 2018

Hi, I hope this will help you out....

It is the voltage reference for the sensor

skinny_monkey · 1 Mar 2018

You can just use oil pressure. For mine, 2 bar at idle is up to temperature

demon · 2 Mar 2018

pooga said:
Anyone know if the sensor specification is available of this? (i am starting to think not!)

Definitely a challenge at least....
- the fact that its a weird "dual" sensor has foxed a lot of people in the past, but it must be possible to take some kind of temp reading from it as the DME does i.e. on my '98 the idle air control valve receives a signal from the oil temp sensor via the DME to indicate when the engine is up to temperature and no longer needs assistance at idle....... every other german car seems to use a coolant temp sensor signal for this, but Porsche opted for an oil sensor... which they then combined with a level sensor...... even though the car has a manual dipstick..... and they then put the huge long sensor under an intake manifold....

....that said, it may be that the DME has a fairly binary input from the temp sensor, rather than a genuine temp scale, as that's likely all it needs on the early cable throttle cars......... : '

Oil temperature sensor specification

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