P38A temprture gauge sender

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ovalandrover

ovalandrover

Well-Known Member
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1,703
Does anyone know where NANOCOM reads the engine temprature. Is it the front sender unit on the head as my Nanocm does not read the water temperature above 60 c and im sure its running hotter than that but the car gauge is reading right in the middle if it is the front sendr unit does anyone know the part no
Thank you in advance
 
ovalandrover said:
Does anyone know where NANOCOM reads the engine temprature. Is it the front sender unit on the head as my Nanocm does not read the water temperature above 60 c and im sure its running hotter than that but the car gauge is reading right in the middle if it is the front sendr unit does anyone know the part no
Thank you in advance
Click to expand...
The sensor for the gauge is separate from the one for the EDC, if the gauge is in the middle, then the temperature is above 80C.
I can never remember but I think the sensor between cylinders 3 & 4 is for the EDC and the sensor between 1 & 2 is for the gauge. Easy to prove, unplug the front one.
 
as Datatek mentioned
 

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ovalandrover said:
Does anyone know where NANOCOM reads the engine temprature. Is it the front sender unit on the head as my Nanocm does not read the water temperature above 60 c and im sure its running hotter than that but the car gauge is reading right in the middle if it is the front sendr unit does anyone know the part no
Thank you in advance
Click to expand...
Your running a diesel? 🤔
 
Screenshot_20250808_080255.jpg
this is of more use my mate👍
Just to give you an idea of where to look.
The later m51 had three sensors, the one closest to the bulkhead is the last minute sensor when it puts the fans on... Normally too late late at that point.
The earlier engine has only two.
As our mate Keith says. One for the engine ecu and one for the gauge in the dash.
The engine ecu temp can cause other faults with fueling and delayed gear change issues. 👍
 
Mark Piercy said:
View attachment 347110this is of more use my mate👍
Just to give you an idea of where to look.
The later m51 had three sensors, the one closest to the bulkhead is the last minute sensor when it puts the fans on... Normally too late late at that point.
The earlier engine has only two.
As our mate Keith says. One for the engine ecu and one for the gauge in the dash.
The engine ecu temp can cause other faults with fueling and delayed gear change issues. 👍
Click to expand...

the no 10 is the one for the ECU and is colured green. the no 6 must be for the gauge and coloured blue .but does anyone know the part numbers for them especially no 6 as i hae a spare no 10
the reason i need no 6 is that the Nanacom is not reading the right temperature as the water temp is much higher than 60 which is what the Nanocom reads.
i am having fueling problems but i have ruled out no 10 sensor as i have replaced it also no 4 injector cranshaft sensor as i have replaced all with a known good ones. I have one more to replace and thats the timing sensor when i get one . I have alsooverhauled the FIP and made sure the timing slide is not sticking .
i need the temperature reading on the NANOCM to know when i do the timing with Datatech method
 
ovalandrover said:
the no 10 is the one for the ECU and is colured green. the no 6 must be for the gauge and coloured blue .but does anyone know the part numbers for them especially no 6 as i hae a spare no 10
the reason i need no 6 is that the Nanacom is not reading the right temperature as the water temp is much higher than 60 which is what the Nanocom reads.
i am having fueling problems but i have ruled out no 10 sensor as i have replaced it also no 4 injector cranshaft sensor as i have replaced all with a known good ones. I have one more to replace and thats the timing sensor when i get one . I have alsooverhauled the FIP and made sure the timing slide is not sticking .
i need the temperature reading on the NANOCM to know when i do the timing with Datatech method
Click to expand...
I thought you said the dash gauge was in the middle? If that is correct, then the temperature should be over 80C so it would be the EDC sensor #10 that is at fault. Nanocom can display the output of both the dash gauge sensor and the EDC sensor, have you checked both?
 
Datatek said:
I thought you said the dash gauge was in the middle? If that is correct, then the temperature should be over 80C so it would be the EDC sensor #10 that is at fault. Nanocom can display the output of both the dash gauge sensor and the EDC sensor, have you checked both?
Click to expand...
i havnt checked the blue sensor but have replaced the green sensor but the NANACOM only gives one reading for the water temerature which wont go above 60 even when the gauge is reading in the center of the dial but when you check the hoses and feel the temp its near boiling it too hot to touch .I havnt got the fan on at the moment but use the air con fans for cooling
 
ovalandrover said:
i havnt checked the blue sensor but have replaced the green sensor but the NANACOM only gives one reading for the water temerature which wont go above 60 even when the gauge is reading in the center of the dial but when you check the hoses and feel the temp its near boiling it too hot to touch .I havnt got the fan on at the moment but use the air con fans for cooling
Click to expand...
I'm pretty sure that Nanocom will read both sensors, just not in the same screen. EDC temperature in the engine module, gauge sensor in the BECM. Just because you have replaced the EDC sensor #10 in the drawing, doesn't mean the replacement is good or that the connections are OK.
 
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As Datatek has said many times the needle on the dash is controlled by the BECM and is not a linear movement. It goes to the middle rather quickly, sits there as long as the temperature is within normal operating limits and then when it goes outside this, climbs ever so damn quickly into the red!

What's the temperature under the EDC section if the Nanocom? Is that where the 60°C is coming from?
 
Weird. I assume (dangerous!) that lower temperature is lower resistance? Smaller resistance then higher voltage and current? So too much current flowing through it? Shorting out somewhere?
 
Grrrrrr said:
Weird. I assume (dangerous!) that lower temperature is lower resistance? Smaller resistance then higher voltage and current? So too much current flowing through it? Shorting out somewhere?
Click to expand...
Not sure what you are on about there. The sensor is a negative coefficient resistor, the current is minimal and in no way dangerous.. The resistance decreases as temperature rises so a short on the return would show a high temperature.
 
Datatek said:
Not sure what you are on about there. The sensor is a negative coefficient resistor, the current is minimal and in no way dangerous.. The resistance decreases as temperature rises so a short on the return would show a high temperature.
Click to expand...

Resistance decreases as temperature rises? Counter-intuitive to me given most things conduct better as temperature drops (think superconductors).


So his low temperature could be it breaking up inside. Or bad connector?
 
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