No volts to Mass Air

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Jun 24, 2011 | 01:14 PM

#16

LT1Jeepin

Registered User

Joined: Feb 2006

Posts: 48

From: Woodlawn, VA

Re: No volts to Mass Air

I believe he means Key On Engine Off.

Jun 25, 2011 | 10:00 AM

#17

GRIDERMAN87

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Registered User

Joined: Jul 2010

Posts: 365

From: Oklahoma---405

Re: No volts to Mass Air

ok, ill look that over is there a common fail point if there is not 5 v to the yellow?

Jun 29, 2011 | 03:31 PM

#18

GRIDERMAN87

Thread Starter

Registered User

Joined: Jul 2010

Posts: 365

From: Oklahoma---405

Re: No volts to Mass Air

ok have 5 v to siganl wire with engine of,f no change when it starts still throws po100 at startup

Jun 29, 2011 | 10:46 PM

#19

Injuneer

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Joined: Nov 1998

Posts: 71,094

From: Hell was full so they sent me to NJ

Re: No volts to Mass Air

The voltage will typically drop to less than 5V when the engine starts.

Does your meter have a frequency scale? If so, hook the frequency meter up across the yellow and black/white wires, and look for ~2,800Hz at idle. The DC voltage is just there to serve as a carrier for the frequency, which is what the PCM looks at to determine the air flow.