EGT Sensor Failure
Lead Driver
Joined: Jan 2010
Posts: 6,600
Likes: 84
If you just let it hang there, the temp would be much different than the others so I wonder if the computer would flag that as an issue, too.
If it wouldn't shut down but limit to 55 due to unbalanced temps, that would be better than nothing.
Someone would have to try it if they run into this issue...
If it wouldn't shut down but limit to 55 due to unbalanced temps, that would be better than nothing.
Someone would have to try it if they run into this issue...
Senior User
Joined: Feb 2012
Posts: 463
Likes: 1
From: San Marcos, TX
If you just let it hang there, the temp would be much different than the others so I wonder if the computer would flag that as an issue, too.
If it wouldn't shut down but limit to 55 due to unbalanced temps, that would be better than nothing.
Someone would have to try it if they run into this issue...
If it wouldn't shut down but limit to 55 due to unbalanced temps, that would be better than nothing.
Someone would have to try it if they run into this issue...
Thread Starter
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Senior User
Joined: Jan 2013
Posts: 151
Likes: 0
From: Spring Hill, SC
The sensors are thermocouples, they do have a resistance, but the computer only uses that to verify no open circuit condition exists at start up.
As exhaust temperature rises, the sensors output in millivolts. the computer uses the strength of the millivolt signal to monitor temps.
My understanding from reading the tsb is the sensors fail internally, and shows very high temps, causing a forced shutdown by the engine protection programming. Thus the STOP SAFELY NOW, and no way of moving.
As exhaust temperature rises, the sensors output in millivolts. the computer uses the strength of the millivolt signal to monitor temps.
My understanding from reading the tsb is the sensors fail internally, and shows very high temps, causing a forced shutdown by the engine protection programming. Thus the STOP SAFELY NOW, and no way of moving.
They are actually RTDs. A resistor installed in the place of the bad sensor should trick the computer to allow the code to be reset.
Exhaust Gas Temperature (EGT)
Sensors
The EGT sensors are Resistance
Temperature Detector (RTD) type
sensors. The EGT sensors are
inputs to the PCM. They measure
the temperature of the exhaust gas
passing through the exhaust system at
four different points.
New User
Joined: Aug 2012
Posts: 21
Likes: 0
From: Richmond RI
My apologies for having the wrong info, Did not mean to mislead anyone.
I had assumed they were the same as older pyro sensors.
I do have a spare sensor with me, but we really need to find a way to get Ford to revise the programming so we are not left in harms way when a sensor fails. Mickey Mousing a new $60,000 truck should not be necessary just to get home safely.
https://www-odi.nhtsa.dot.gov/ivoq/
If everyone who has been left stranded filed a complaint it might gain enough notice to get a recall.
I had assumed they were the same as older pyro sensors.
I do have a spare sensor with me, but we really need to find a way to get Ford to revise the programming so we are not left in harms way when a sensor fails. Mickey Mousing a new $60,000 truck should not be necessary just to get home safely.
https://www-odi.nhtsa.dot.gov/ivoq/
If everyone who has been left stranded filed a complaint it might gain enough notice to get a recall.
Posting Guru
Joined: Jan 2010
Posts: 1,616
Likes: 6
From: Whitecourt AB, Canada
They are actually RTDs. A resistor installed in the place of the bad sensor should trick the computer to allow the code to be reset.
Exhaust Gas Temperature (EGT)
Sensors
The EGT sensors are Resistance
Temperature Detector (RTD) type
sensors. The EGT sensors are
inputs to the PCM. They measure
the temperature of the exhaust gas
passing through the exhaust system at
four different points.
Exhaust Gas Temperature (EGT)
Sensors
The EGT sensors are Resistance
Temperature Detector (RTD) type
sensors. The EGT sensors are
inputs to the PCM. They measure
the temperature of the exhaust gas
passing through the exhaust system at
four different points.
Many pyros are similar to K-type thermocouples though, usually thermocouples are more suited to high temperature applications where RTDs fail, and, well, this is I guess where they fail. Also these are 2-wire RTDs, which I guess gives sufficient accuracy for the application but the resistance of the wiring leading up to the RTD itself is not taken into account.
Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,868
From: Frederick, MD
you all make it difficult. Make the connect for the sensor a ground and then it will work.
Still will have the code and the check engine light but you will be able to drive it.
That is what you could do on the 6.4. Just that there was a jumper wire off the battery to do that.
Still will have the code and the check engine light but you will be able to drive it.
That is what you could do on the 6.4. Just that there was a jumper wire off the battery to do that.
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Posting Guru
Joined: Jan 2010
Posts: 1,616
Likes: 6
From: Whitecourt AB, Canada
What is the input range scaling? What is the full range reading or the zero reading scaled to, in terms of temperature in degrees? i.e. what does the computer read when you have that input grounded?
Thread Starter
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Senior User
Joined: Jan 2013
Posts: 151
Likes: 0
From: Spring Hill, SC
I don't think it's that simple. The PCM is looking for a resistance range to be happy. If you ground out the sensor, the PCM will see value as 1 ohm or less. This value is far too low, I would think a round number of around 400-600 ohms would work.
Super Moderator
Joined: Aug 2008
Posts: 37,384
Likes: 1,868
From: Frederick, MD
my plan is just a simple piece of aluminum foil in the connection changing it to a ground then plug it back in.
You will still have the code/CEL but will be able to drive an change it later.
You will still have the code/CEL but will be able to drive an change it later.
Senior User
Joined: Feb 2012
Posts: 463
Likes: 1
From: San Marcos, TX
Is this right?
If a sensor fails, the engine will shut down and not restart. Then if I replace the failed sensor, reset the code with my CTS, it will restart?
This is really all that matters to me. I don't want to bypass anything, just get it going and not look back.
If a sensor fails, the engine will shut down and not restart. Then if I replace the failed sensor, reset the code with my CTS, it will restart?
This is really all that matters to me. I don't want to bypass anything, just get it going and not look back.