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False Air temp readings

PostPosted: Mon May 26, 2025 7:57 pm
by acca
Hello
I have a Bosch 0281002680 Tmap sensor that gives overestimated temperature readings of approx 5°C

it is connected to a M600 ECU on A9 A15 B3 and B16 pins.

I chose Bosch 2500Ohm Predefined calibration and tried the calibration table given on this page : https://www.motec.com.au/products/TMAP%20Sensor

Both overestimate temperature.

I tried two different sensors (same reference).

I don't understand where is the problem

Re: False Air temp readings

PostPosted: Tue May 27, 2025 10:09 am
by Stephen Dean
Normally the Bosch TMAP sensors all use the same Temp sensor, but it looks like this model may use a different sensor that I do not have a calibration for.

What are you using for a reference temperature?

Re: False Air temp readings

PostPosted: Wed May 28, 2025 2:10 am
by acca
A ctn 2,2k with resistor bridge.