1G MAF not working?!

[slayer_699]

Hello. I am finishing my build and the only problem I am having is that in link there is no airflow movement. Like when I start the car it is saying 7gm/s. If I rev the car it goes to 10gm/s. It gives the exact same reading with the maf unplugged. I checked to make sure the wires at the maf plug are grounded and have power if there suppose to, and they all do. I also made sure there is no break in the wire that sends the airflow signal to the ecu. I used a ohm meter and there was resistance at the plug and at the ecu. ANY help would be awesome as I am at a loss of knowldge on what to do next. The car starts but runs like crap as if the maf was unplugged. Thank you in advance!!

 

[Sjd6795]

Could the maf itself be bad? Mine was kind of having similar problems until I swapped to a 3" gm maf

 

[slayer_699]

Sorry I forgot to mention I've tried 3 mafs already..

 

[bryanwheat]

If you have tried 3 and none work than you have an issue with the wiring, or something wrong with the ecu. Is this a 1g of a 2g?

 

[slayer_699]

Ecu is known good from my other car and car is a 1g. 91 if that matters. I'm curious if there's another way to test the wiring besides checking resistance in wires or something? So I know the maf and ecu are good cuz I swapped them from another car that work.

 

[bryanwheat]

Checking for continuity is the best way. The green/yellow wire is the barometric pressure wire which is pin 16 on the ecu and pin 7 on the maf plug. The green/blue wire is the airflow signal wire which is pin 10 on the ecu and pin 2 on the maf plug. The green/orange wire is intake air temp wire which is pin 8 on the ecu and pin 8 on the maf plug. The green/red wire is the +5 volt supply wire for the maf which is pin 23 on the ecu and pin 4 on the maf plug. The green/black is the sensor ground which is pins 24 and 17 on the ecu and pin 6 on the maf plug. The red wire is the source from the mpi relay which is pin 3 on the maf plug. The green/white wire is the airflow reset wire which is pin 6 on the ecu and pin 1 on the maf plug. You need to test continuity for each on the ecu plug to the sensor plug on the baro, intake temp, maf signal and maf reset wires. Also verify that none of these wires have continuity to ground (short to ground). Than you need to verify 5v in the green/red wire, ground in the green/black wire, and 12v at the red wire.

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