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MAF sensor

wiring problem

MAF sensor

Postby Clubfingers [OP] » Jan 10 2018, 3:09am

ive been trying to test my maf sensor on my truck. they say test the three wires of the connecter, one is power (it reads 12 volt, second wire ground, and third wire is signal wire. ( but it has a steady 5 volts when the key is on but the sensor is not connected) Is this right or is my wires shorted out. please help me . i need my truck running.
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Re: MAF sensor

Postby Welcher774 » Jan 10 2018, 3:33am

The 5volts if the reference wire that is ok. They might be saying to ohm the sensor not plugged in.
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Re: MAF sensor

Postby Clubfingers [OP] » Jan 10 2018, 3:51am

the wire with % volts is the signal wire, I thought it was to send voltage back out of the sensor, but if I test the wire not connected to the sensor it has 5 Volts already flowing through the signal wire without being hooked up. Shouldn't the MAF sensor be putting out the voltage?
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Re: MAF sensor

Postby Welcher774 » Jan 10 2018, 4:02am

If you dont have 5v on the line then an issue. Ohm the maf to see if open or shorted.
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Re: MAF sensor

Postby Clubfingers [OP] » Jan 10 2018, 4:28am

I'll check it that way. Thank you
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Re: MAF sensor

Postby apcnc » Jan 10 2018, 6:02am

Are you checking relative to ground or between the wires?
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