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Old 11-17-2011, 07:27 AM   4 links from elsewhere to this Post. Click to view. #1
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Coolant temperature sensor values

Could someone please post up what the resistance values on the engine coolant temp. sensor should be? I'm looking for cold and hot values.

I'm referring to the sensor that reports to the PCM, not the one that drives the temp. gauge on the dash.

Thanks,

Rich
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Old 11-17-2011, 08:38 AM   #2
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Re: Coolant temperature sensor values

Quote:
Originally Posted by 355_Md View Post
Could someone please post up what the resistance values on the engine coolant temp. sensor should be? I'm looking for cold and hot values.

I'm referring to the sensor that reports to the PCM, not the one that drives the temp. gauge on the dash.

Thanks,

Rich
The ECT is the same reference for the PCM and temp gauge.

0 - 10K negative temperature coefficient.
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Old 11-17-2011, 10:26 AM   #3
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Re: Coolant temperature sensor values

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The ECT is the same reference for the PCM and temp gauge.

0 - 10K negative temperature coefficient.
Wow, 0-10k ohms is quite a wide swing. Would you happen to know what the typical reading is on an engine that has reached normal operating temperature?

Basically, the issue is that another forum member was able to cure a P0017 crank/cam correlation error code by replacing the coolant sensor.

Before I follow suit, I wanted to check my sensor to see if it's faulty.
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Old 11-17-2011, 10:40 AM   #4
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Re: Coolant temperature sensor values

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Originally Posted by 355_Md View Post
Wow, 0-10k ohms is quite a wide swing. Would you happen to know what the typical reading is on an engine that has reached normal operating temperature?

Basically, the issue is that another forum member was able to cure a P0017 crank/cam correlation error code by replacing the coolant sensor.

Before I follow suit, I wanted to check my sensor to see if it's faulty.
GM modulates the voltage reference to the sensor for error correcting. Basically the DAC runs out of bits. I have the data somewhere, I will look around.
When I was designing the SFAN4500 efan, I design an interface that would tap the ETC sensor to control the efan temp.
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Old 11-17-2011, 02:51 PM   #5
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Re: Coolant temperature sensor values

Supermod-

Very cool, the work you did with the engine fan. Basically all I wanted to do was test the sensor. Since you said that the normal operating range was 0 - 10k ohms, I unplugged it from the wiring harness and checked it with an ohm meter when it was cold, then ran the engine to normal operating temperature.

Value at nearly cold iron- 9k ohms
Value at nearly normal operating temp- 352 ohms

The sensor itself seems to be fine, so I've ruled that out. Thank you for your help.
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Old 11-17-2011, 03:05 PM   #6
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Re: Coolant temperature sensor values

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Originally Posted by 355_Md View Post
Supermod-

Very cool, the work you did with the engine fan. Basically all I wanted to do was test the sensor. Since you said that the normal operating range was 0 - 10k ohms, I unplugged it from the wiring harness and checked it with an ohm meter when it was cold, then ran the engine to normal operating temperature.

Value at nearly cold iron- 9k ohms
Value at nearly normal operating temp- 352 ohms

The sensor itself seems to be fine, so I've ruled that out. Thank you for your help.
I like your trouble shooting skillz.

Now go and repeat your tests but this time measure both the ref voltage and the ETC sensor voltage in cold and normal running conditions.


And thank you for your contribution, so others can learn from your info!
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Old 11-17-2011, 03:12 PM   #7
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Re: Coolant temperature sensor values

What you say makes sense, but I don't know where to tap in to measure these voltages. I'm using a handheld multi-meter. I don't have a scan tool or an Ultra gauge to tell me this.

Can this be checked with a hand-held volt meter?
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Old 11-17-2011, 03:36 PM   #8
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Re: Coolant temperature sensor values

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Originally Posted by 355_Md View Post
What you say makes sense, but I don't know where to tap in to measure these voltages. I'm using a handheld multi-meter. I don't have a scan tool or an Ultra gauge to tell me this.

Can this be checked with a hand-held volt meter?

Just measure the high side of the sensor with your DMM.
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Old 11-17-2011, 03:40 PM   #9
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Re: Coolant temperature sensor values

Ok I know I seem to be a little slow, but the way I measured the resistance of the sensor was by unplugging it from the harness, and touching the meter prongs to the plug contacts.

If I plug the sensor back into the harness, I can't physically touch the meter prongs to anything to read the voltage. Or can I? Is there a space for meter leads to dig in there?
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Old 11-17-2011, 03:47 PM   #10
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Re: Coolant temperature sensor values

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Originally Posted by 355_Md View Post
Ok I know I seem to be a little slow, but the way I measured the resistance of the sensor was by unplugging it from the harness, and touching the meter prongs to the plug contacts.

If I plug the sensor back into the harness, I can't physically touch the meter prongs to anything to read the voltage. Or can I? Is there a space for meter leads to dig in there?
Use a pin or needle threw the truck harness wire then RTV it.
The sensor harness uses Teflon wire which is a bitch to pierce.
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Old 11-17-2011, 05:12 PM   #11
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Re: Coolant temperature sensor values

Ah, gotcha. I'm out of daylight and out of heat, so I'll try it tomorrow and let you know how it goes.
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