Duramax Diesels Forum Truck of the Week
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Old 05-30-2018, 07:04 PM
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Default 1996 Sierra canít get rid of MAF code

Shot in the dark here but maybe someone knows. Picked up a 96 Sierra with the 5.7 Vortec. I canít get rid of a p0102. Comes up as MAF circuit low. Tried two different sensors. One being new. The old sensor the truck runs rough when plugged in. Unplug it it runs fine. Truck runs great with the new sensor. No stumbling no rough idle or anything. 3 wire pigtail has 12v to ground for power and 5v to ground signal. But the code will not go away. Left negative cable undone all night twice and still on. Tried to clear multiple times with a scanner. The light turns off and immediately back on. And when it blinks the truck stumbles. No Intake leaks that I can see or vacuum via some brake cleaner sprayed everywhere. Iím at my whits end here.
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Old 05-30-2018, 07:25 PM
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I would check continuity of the wires back to the ECM. Make sure you have no breaks or bad connections especially on the signal wire.
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Old 05-31-2018, 04:50 AM
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Clear it with a tech 2 or solas scanner first, stored codes can't all be cleared with cheap scanners...
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Old 05-31-2018, 08:17 AM
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Originally Posted by NC-smokinlmm View Post
Clear it with a tech 2 or solas scanner first, stored codes can't all be cleared with cheap scanners...
I thought about that. Will give that a try. Thanks man
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Old 05-31-2018, 09:29 AM
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If removing the battery cables overnight doesn't clear it, the code is getting set again. Those old ECUs (and even new ECUs AFAIK) don't have a way to retain error codes in memory once the battery is disconnected for more than a minute or two.

I would do what 2004LB7 suggested and trace all the wires for the MAF back to the ECU, looking for damage, corrosion, loose connections, etc. I think you still have a physical problem.
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Old 05-31-2018, 02:09 PM
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Could there still be a problem even if the wires test good? What I’m not understanding is I have the correct voltages
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Old 05-31-2018, 02:14 PM
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Quote:
Originally Posted by zakkb787 View Post
Could there still be a problem even if the wires test good? What Iím not understanding is I have the correct voltages
yup, it would mean its a ECM issue. make sure the wires back to it and coming out of it all have good connection and are not being pushed out as you plug the harness in. otherwise it may be the ECM having internal issues.
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Old 05-31-2018, 02:53 PM
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When you measure the voltage coming out of the sensor whare are you taking the measurements? If it is right at the sensor then a bad wire, connection or otherwise can prevent the signal getting back to the ECM. This is why you need to check the wires all the way back.

The fact that you have good voltage to the sensor should rule out that wire.ake sure you have a good ground and that the sensor signal wire doesn't have more then an ohm or so back to the ECM. Ideally zero ohms on all wires
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Old 05-31-2018, 03:34 PM
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Measured the voltage at the plug for the MAF. I’ll check out the wires. I’m tired of working on stuff
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2003 Yamaha YZ250
2003 Kawasaki Z1000
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Old 05-31-2018, 08:15 PM
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Get a test probe and test ground the maf and see if the code clears.
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Old 06-01-2018, 05:13 AM
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Had that on my work truck recently...turned out to be a NoX sensor issue along with the maf

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Old 06-01-2018, 08:29 AM
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That’s what I’m beginning to be afraid of. Chasing down problems that I don’t know where to start. If the wires check good it’s pribably going on Craigslist and make a few hundred. Let someone else deal with it.
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2003 Yamaha YZ250
2003 Kawasaki Z1000
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Old 06-01-2018, 07:13 PM
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Strangest thing. Might be fixed. Mom and dad went down and put a new gas cap on it and reset the computer and somehow the code is gone. And hasn’t came back. Ugh. Damn GM. We will see if it comes back haha
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2011 Yamaha YFZ450X
2003 Yamaha YZ250
2003 Kawasaki Z1000
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Old 06-02-2018, 01:59 PM
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Well the MAF cod is gone. Now throwing a p0134 for bank one o2 sensor. Yay. Lol hopefully that’s all it is
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2011 Yamaha YFZ450X
2003 Yamaha YZ250
2003 Kawasaki Z1000
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  #15  
Old 06-02-2018, 02:39 PM
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Take it out, spray it with brake cleaner and spray some sea foam into the bung for it. Then go drive the shit out of it...
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