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I am trying to get the oil pressure logged in Ecutek via the CPC input with no luck. I am hoping someone here can point me in the right direction.
. I had this sensor installed: https://www.bosch-motorsport-shop.co...-10-bar-140-de
. It is grounded to the car chassis, powered via the ECU and pinned to the CPC Input.
. In Ecutek the CP sensor input was overwritten to use the CPC input and 2D table updated for the conversion of voltage to Pressure.
. The oil pressure sensor is working properly and the right voltage is sent to the ECU (confirmed via a multimeter, at the pin)
Looking at the data logged in ECUTEK the reading is showing a flat 10 bar all the time. Looking at the raw input via the parameter CPS voltage, it oscillates between 4.98V and 5V
Looking at the previous posts https://www.ft86club.com/forums/showthread.php?t=61573 and https://www.ft86club.com/forums/showthread.php?t=94751
It looks like the input is not working, hence always reading 5V.
Any idea what is missing in my setup for this to work? I have a 2019 Australian 86.
What is the signal pin on the sensor outputting?
If you have 5V on the output pin when it isn't connected to the ECU, then the sensor wiring needs to be checked.
If the ECU Pin has 5V on it when the sensor is not connected, then it sounds like a AT is being used, this will be getting pulled up to 5V by the internal pull up resistor.
The sensor output voltage is correct and not maxed out to 5V.
Can you please explain what "then it sounds like a AT is being used" means for a beginner?
The Difference between an AV (Analogue Voltage) and AT (Analogue Temperature) input on an ECU is that the AV is internally linked to the 5V+ rail of the ECU through a 1k (typical, some use a 2.2k) pullup resistor. This provides approximately 4.98V~5V on to the pin. When a NTC sensor is connected to this input, then the variable resistance of the temperature sensor changes the voltage seen on the pin, allowing for a voltage based calibration to be used with that sensor.
An AV sensor does not have this pullup to 5V. You can make a AV into an AT by installing a 1k pullup resistor to 5V in the external wiring.
This is great. Thank you so much for the explanation Stephen.