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Tempurature sensors

 
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Old 12-08-2010, 03:15 PM
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Tempurature sensors

Ok so I have been having this issue for a while now were my temp gauge contently tells me my engine is overheating when in fact that is not the case. The second issue to follow that is my cooling fans only pick and choose when they want to come on and its not often that they come on. I've counted like 4 times at the most since august so yeah its very rare occurrence. I know the fans are good because I jumped the relay and they stayed on all the time till I un jumped it. I also tested my relay in my buddy's car and it works they way it should so I am thinking it has to do with the temp sensor not reading accurately.


I know to see if I have bad sensors I need to check the resistance of them with a multi meter. I own I multimeter I just not to sure what setting to put it on to check the sensors as well as what numbers should I be reading when checking the sensor. My multimeter looks like this

and the sensors are in a 1993 Honda Prelude SR-V with a JDM H22A
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Old 12-09-2010, 01:06 PM
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Re: Tempurature sensors

anyone???
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Old 12-09-2010, 02:10 PM
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Re: Tempurature sensors

no sorry havent a clue mann
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Old 12-09-2010, 03:21 PM
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Re: Tempurature sensors

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Originally Posted by RaNd0b View Post
no sorry havent a clue mann
Very helpful.


To check resistance you should have that biznitch set to read Ohms. It is represented by an Omega symbol. Looks like a horseshoe. You black lead needs to be plugged into ground hole, and your red one needs to be plugged into your volts hole (notice there is an omega symbol there too.)

As far as what ohms, I haven't the slightest. I do know that it needs to change (as it gets hot ohms should go either up or down, and vice versa when it gets cold. Depends on whether or not it is a positive or negative coefficient sensor, or some sht like that.)



Other than that, I don't know much. I searched quickly for testing procedures but came up with nadda. Did you check the owners manual? Chilton book?
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Old 12-10-2010, 01:37 AM
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Re: Tempurature sensors

There's different readings for what the resistance should be with the temperature. I need to change mine cause my resistance is off for it. I don't remember the resistance levels. If the car is cold the resistance should be around 1 if I remember correctly. Normal operating temperature is like .5 ohms.


Found it on AllData
Resistance


At 0C (32F) 5.0 - 7.0 K Ohms

At 40C (104F) 1.0 - 1.5 K Ohms

At 100C (212F) 0.3 - 0.4 K Ohms

Last edited by ThE_K9; 12-10-2010 at 09:48 AM.
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Old 12-10-2010, 01:16 PM
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Re: Tempurature sensors

so bascially to test it all i need to do is unplug the sensor and stick the metal prongs to the possitve and negative of the sensor right? This way I get a proper readings? Also thanks for the numbers i need to figure out whats going on thats a huge help. thanks
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Old 12-10-2010, 02:06 PM
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Re: Tempurature sensors

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Originally Posted by Unreachable View Post
so bascially to test it all i need to do is unplug the sensor and stick the metal prongs to the possitve and negative of the sensor right? This way I get a proper readings? Also thanks for the numbers i need to figure out whats going on thats a huge help. thanks
Just remember that wen you test resistance the part you are testing needs to be OUT of the circuit. Disconnected entirely...

You can also test it with amps. Think about ohms law. If the resistance goes down, the amps go up. If resistance goes up then the amps go down. You may also be able to do it with volts too, as volts is the easiest. Really depends on whether or not its a series or parallel or series-parallel circuit. Although my memory of different types of circuits and the coorelation of I/E/R is kinda fading, so I forget.


Also remember to take the necessary precautions whenever testing amps, so you don't pop the fuse in your DMM.


Anyway your best bet is to follow the outlined testing procedures.
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Old 12-12-2010, 02:35 AM
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Re: Tempurature sensors

Unplug the sensor. Connect black lead to ground, stick red lead to the connection of the sensor(the black thing that gets plugged in) and that's what the reading should be given to the ecu.
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Old 12-14-2010, 12:09 AM
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Re: Tempurature sensors

PLEASE post your results when you test!! I've been having this same problem (I think) since March and testing the sensors is my last step (even after replacing them).

When your car shows overheating, if you turn the key off for 5sec and then back on, does the engine temp show normal again for awhile?
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Old 12-14-2010, 12:35 AM
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Re: Tempurature sensors

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Originally Posted by Lindso View Post
PLEASE post your results when you test!! I've been having this same problem (I think) since March and testing the sensors is my last step (even after replacing them).

When your car shows overheating, if you turn the key off for 5sec and then back on, does the engine temp show normal again for awhile?
No problem I'll def let you guys know what the outcome was. I just haven't got around to it because i've been busy with work.


as for when I shut my car off and turn the ignition back on it does read normal for a a little while again. SO yes my car does exactly asd you described. Does yours sometimes just work normal for the length of your drive?
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Old 12-14-2010, 02:55 AM
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Re: Tempurature sensors

Yeah it's completely erratic.
Just like you said, the fans only come on every once in awhile but then go right back off. I've attributed this to the fact that whatever temperature switch they're running off (either temp switch A or B) is correctly reading the coolant temp and engaging the fans when necessary.

I actually have 2 temp gauges hooked up to the sending unit right now and I'm trying to get them to read accurately, simultaneously, but can't- The stock one shows one block and the aftermarket shows 230 degrees so that's a no go. I've literally tried everything but testing the integrity of the sensors themselves cuz I don't have access to volt meter.
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Old 12-15-2010, 12:26 PM
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Re: Tempurature sensors

to bad u don't live up here in canada we could try to fix this issue together lol.
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Old 12-15-2010, 06:09 PM
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Re: Tempurature sensors

I freakin wish! I've posted several threads throughout having this issue and have gotten help, but nobody that knows the exact issue. This is what I've done/replaced;

-Coolant flush x2
-40/60 coolant to water ratio w/Royal Purple cooling additive
-Thermostat to 180 degree
-ECT sensor
-ECT sending unit
-Different ECU
-Different stock gas/temp gauge cluster
-Bled of air each time I changed something
-New radiator cap
-System pressure test (Held PSI steadily)
-Aftermarket gauge
-Probably a few other things

So yeah I don't know what else there is for me to do other than what you're doing. If I could find a diagram of the ECT sending unit wiring so see if it's running through a relay or through the ECU or whatever, I'd probably have a little better idea of things but I can't find a diagram or info on it.
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Old 12-28-2010, 08:38 PM
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Re: Tempurature sensors

After your temp gauge teaches the overheat Mark if I just sit there and idle after a bit it goes back to normal 2 min at the most does yours?
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Old 12-29-2010, 12:20 AM
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Re: Tempurature sensors

It's too sporadic to really say it does one particular thing. I'm sure it does that though, or something similar. I usually just get pissed and turn the car off and on again when I see the red mark light up. I do remember feeling defiant with it a couple times and just sat there and let it think it's overheating, and yes I remember it going back down to normal temp.
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Old 12-29-2010, 11:54 AM
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Re: Tempurature sensors

Unfortunately I still haven't got around to checking the resistance of the sensor. Been way to cold most of the time up here to even bother lol. I am hoping to get it done soon.
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Old 12-30-2010, 04:25 AM
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Icon14 Re: Tempurature sensors

This is from the service manual. It might help.



1. Check the No. 13 (10 A) fuse in the under-dash fuse box before testing.
2. Make sure the ignition switch is OFF, the disconnect the RED wire from the cooland temperature sending unit and ground it with a jumper wire.
3. Turn the ignition switch ON. Check that the segments of the coolant temperature gauge light up.

CAUTION: Turn the ignition switch OFF immediately after the segments light up. Failure to do so may damage the gauge.

If the segments do not light up, check for an upen in the YEL or RED wire. If the wire is OK, replace coolant temperature gauge.

If the segments light up, check the sending unit.




1. Disconnect the RED wire from the sender.
2. With the engine cold, use an ohmmeter to measure the resistance between the positive terminal and the engine (ground).
3. Check the temperature of the coolant.
4. Run the engine and measure the change in resistance with the engine at operating temperature (radiator fan comes on).



5. If the readings are substantially different from the specifications above, replace the coolant temperature sending unit.
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Old 12-31-2010, 10:40 AM
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Re: Tempurature sensors

well doesn't that make stuff just that much more easy now lol. Good thing I now have a printer to use to print off that info lol and this week is supposed to hit close to the double digits I can work in that not when its like minus ten out lol
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Old 12-31-2010, 09:41 PM
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Re: Tempurature sensors

There are 3 different temperature sensors.
1. Sensor that turns the fan on/off
2. Sensor that relays the temperature to the ECU
3. Mini-sensor that lights up the temperature bars in the dash

If you have a 96 or higher lude, the coolant temperature sensor reading is part of the OBD-II live data.

Sensor 1 is close to the radiator. Sensor 2 and 3 are right next to the thermostat.

If fans are not coming on but sensor 2 and 3 are reporting overheating, then maybe there is a coolant flow problem - maybe water pump.

I don't know how accurate this would be - but you could get the laser non-contact temperature reader from harbor freight and check the temperature of the coolant along the various coolant lines and see if there is a flow problem.

You said you already changed thermostat and did coolant flush so that can't be the problem of stuck thermostat or clogged lines.
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Old 01-20-2011, 11:25 PM
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Re: Tempurature sensors

if you find out what was wrong with it you should send me what you found out in a private message, this has been happening to my car since like a week after i bought it, i have no idea if its the wrong reading or if my engine is really overheating and i dont like risking it by keeping my car on when the gauge is over half because one of my cars threw a rod, because the oil pump went out, but when i got the car the oil light was already on and the dude said it was always like that but then i was driving it a few weeks later and it blew a rod, so if you find out the answer message me please. oh and its not the thermostat because i already changed that
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