What is the purpose of these 10nF capacitors on all the ECU input pins?
Image source: https://www.finjector.com/documents/647ef11579093/TKU-0261230340-.pdf, section 2.4. Error diagnosis
The purpose of these 10nF capacitors
bypass-capacitorcapacitordecoupling-capacitor
Best Answer
They are for EMI suppression. To keep noise from entering and/or leaving the ECU.