MAFsensor test
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
I don't know about off the car, but hooking up to a scanner can show you if it's working properly or not.... The air flow is measured in Grams and the "Factory Service Manual" will tell you what readings are normal...WW
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
It is possible to test it off the car but you'd need a lot of electronic technical knowledge to do it. Using a scanner would be a lot easier, as WW7 suggested.
Just for reference: the MAF uses 12 volts as it's power source. The output to the ECM has a 10K pullup resistor to 5 volts inside the ECM. You would have to simulate that pullup resistor somehow. Then you could measure the output signal. It's directly proportional to air flow. Low voltage at low air flow and up to 5 volts at high air flow.
Just for reference: the MAF uses 12 volts as it's power source. The output to the ECM has a 10K pullup resistor to 5 volts inside the ECM. You would have to simulate that pullup resistor somehow. Then you could measure the output signal. It's directly proportional to air flow. Low voltage at low air flow and up to 5 volts at high air flow.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
DTC 48 - Mass Air Flow (MAF) Sensor Circuit
Last edited by WW7; Jul 25, 2013 at 11:27 AM.
Thread Starter
Pro
Joined: Oct 2012
Posts: 672
Likes: 2
From: Cheltenham, England
That's not right.... Mine starts around 10 grams at idle and goes up smoothly as the rpms increase.. If it's jumping, it's either a bad MAF or like you said , it could be wiring...The range on stock MAF sensors is 0 to 256 grams if Im remembering right...Could you get a known good maf sensor from someone and see what reading you get with that installed ???...WW
DTC 48 - Mass Air Flow (MAF) Sensor Circuit
DTC 48 - Mass Air Flow (MAF) Sensor Circuit
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Don't you know another Corvette owner that you can swap maf sensors with for a few minites to see if that's the problem.. If you buy a maf sensor and find out that's not the problem, you can't return it because electronics can't be returned...I would check the wiring first before buying parts, it may turn out to be just the plug or wiring ....WW
Last edited by WW7; Jul 25, 2013 at 12:36 PM.
Thread Starter
Pro
Joined: Oct 2012
Posts: 672
Likes: 2
From: Cheltenham, England
Don't you know another Corvette owner that you can swap maf sensors with for a few minites to see if that's the problem.. If you buy a maf sensor and find out that's not the problem, you can't return it because electronics can't be returned...I would check the wiring first before buying parts, it may turn out to be just the plug or wiring ....WW
BTW, Is there any other component in the circuit that may have gone bad?
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