Exhaust gas temp sensor
Discussion
Up stream from the DPF on my diesel Merc there is a gas temperature sensor. I am making the assumption that the ecu uses this to determine if the temperature is nice and hot before throwing in a bit more fuel to clean the filter. I have an intermittent management light and a code reader points towards the temp sensor reading being out of range ( -172c) .
Is this going to be something like a thermocouple generating a temperature related voltage or is it going to be a temperature related resistance ? If I knew what the ecu was expecting I could simulate the sensor or at least measure the output.
Is this going to be something like a thermocouple generating a temperature related voltage or is it going to be a temperature related resistance ? If I knew what the ecu was expecting I could simulate the sensor or at least measure the output.
In this case I think there are two sensors, one in front of the turbo and one in front of the DPF, it is the DPF one I am interested in.
The part has a simple two pin connector so I am assuming it is a thermistor. If it had an inbuilt amplifier or pwm driver I would expect more pins.
I would be interested to know the normal resistance range. The example I have changes from 200k when cold to 300k hot. I would expect a bigger change and a significantly lower reading.
The part has a simple two pin connector so I am assuming it is a thermistor. If it had an inbuilt amplifier or pwm driver I would expect more pins.
I would be interested to know the normal resistance range. The example I have changes from 200k when cold to 300k hot. I would expect a bigger change and a significantly lower reading.
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