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Old 05-27-2015, 04:17 PM   #8
jvlagsma's Avatar
Join Date: Jun 2007
Location: Netherlands
Default EGT sensor

Sounds to me like your EGT sensor is shot. It uses a K type thermocouple that would be generally available but I didn't get one to work on the electronics. It would need calibration but the circuit is difficult to fathom let alone do the calibration. What I know is the output is an open collector pulse width modulated signal. To test the sensor, apply 12V and ground, use a pull up resistor of 1k from signal to 12V and use a scope to look at the signal. You'll see a square pulse if the electronics work properly. Heat the tip of the sensor and you should see the duty cycle of the signal change. Close to 100% duty cycle equals some 900 deg C.
I ended up getting a used EGT sensor, the second one worked.
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