PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
Tronic wrote:Hi again!
Well, the MAF should not be connected in this measurement. If I had the MAF connected it would have fooled me. Think of this, if there is an internal faut in the MAF, as in this case, it would be 12 volts on pin 5, sure as a letter from Royal mail. The only way to be confident that there is nothing wrong in the wire harness or an internal ECU fault, is to disconnect the MAF, then you can safely point out where the fault is.
The 12 volts at pin 5 - output from MAF - resulted in an air mass no less than 240g/s
Looking at the wiring diagram and the checking procedure, as you rightly point out pin 5 should not have 12 V present when the MAF is connected. As an 'electronics expert, I do mean you and not me' you could make oneself a variable voltage regulator quite cheaply and turn the voltage down on pin 5 to a typical 1.4 V at idle.Tronic wrote:Hi again!
Well, the MAF should not be connected in this measurement. If I had the MAF connected it would have fooled me. Think of this, if there is an internal faut in the MAF, as in this case, it would be 12 volts on pin 5, sure as a letter from Royal mail. The only way to be confident that there is nothing wrong in the wire harness or an internal ECU fault, is to disconnect the MAF, then you can safely point out where the fault is.
The 12 volts at pin 5 - output from MAF - resulted in an air mass no less than 240g/s