Engine throws codes for bad MAF

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Sc400dude

New Member
Hey there, I've been working on my sc400 and keep getting shuddering and stalling when driving. The car runs extremely rich and idles all over the place too. Ive replaced the maf sensor twice now and still nothing. The wiring harness appears to be in working order too. I'm getting check engine codes 22, 24, and 31 saying all of these circuts are open or shorted. I'm loosing my mind and the mechanic says its the maf too but obviously it's not as theres been two different units installed with little to no change. The car also still runs like crap with the maf unplugged. Some help would be greatly appreciated. Thanks.
 
I would be finding a known good MAF. Common failure so I have a test unit here for this purpose. Also checking live data , continuity testing wires and putting an oscilloscope on the signals helps. Cheers
 
When you say the wiring is in working order, how did you check it?
What about other factors, ie, air leaks around the AFM area? Hoses disconnected?
And where are you located?
 


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