Question about 2004 GMC Sierra

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2004 gmc sierra

Hi a code p0102 came up should i replace the sensor or can someone tell me how to test the sensor

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  • oksmitty Apr 07, 2009

    I have the same code on a 1997 4.3 Vortec PO102 It skips after two COMPLETE tune ups at rpms over 1500 worse on wet days.The Plugs all are sweet looking. Your tests are good but can we go deeper into the output of the MAF?





    ok after that can you clean the probe with Alcohol? What is the out put on the third wire? Volts or milliamps ? Can you get in series with the output and monitor the output volts or amps over a rpm range????Or is it a digital output???

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P0102 is mass air flow sensor circuit, low input the MAF is attached to the air cleaner where the hose runs out of it... Unplug it and check the voltage supply and the ground... looking into the plug, with the tab facing up, there will be 3 connecters inside it, left to right they are.... sensor signal, ground and supply.... make sure you have 12 volts at your supply and the ground is good good luck

Posted on Feb 28, 2009

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