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Old 09-21-2022, 04:40 PM   #1
VolvoScout
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Default 3-2-2 Code, MAF/AMM

Car: 1990 240 B230F AW70

Wagon is showing a 3-2-2 code, which to my knowledge indicates a "bad MAF"
I think the car might also be running lean at the moment.

I've tried 5 different MAFs (3 new, 2 used) all of them have a rough idle (some less than others) and they all throw a 3-2-2 code.

Could it be an electrical wire somewhere else in the system rather than the MAF itself?
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Old 09-21-2022, 04:57 PM   #2
dl242gt
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How are the contacts in the connector? I would also check the fuel ecu for being a 561 unit. They make false codes and don't run quite as smooth as the 951 version. Also while you're checking the fuel ecu. Check the connector contacts for the ecu. I've had them push out of the contact area of the connector. Needed to be snapped back into place.
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Old 09-21-2022, 08:32 PM   #3
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That's a code for the maf hot-wire burnoff function not working. It has a dedicated ECU-to-MAF white wire (ECU pin 8 to MAF pin 4). I'd start by checking the white wire at the MAF connector as Dave suggests ^^^.
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Old 09-21-2022, 09:23 PM   #4
ZVOLV
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You gotta drag test the terminals with the proper test probe, or make a probe made from an old component. I'd resistance test and voltage drop test the circuit. If it tests good try another ECU.
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Old 09-22-2022, 12:14 AM   #5
billkaz
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Had the same code pop up on my 92 240 recently.

Check the fuse for corrosion (fuse 4)
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Old 09-22-2022, 12:47 PM   #6
dl242gt
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You can use a test light to confirm whether you are getting burn off. Backprobe the connector on the maf on the burn off wire and see if it briefly turns the light on about 45 seconds after you shut the engine off.
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Old 09-22-2022, 06:36 PM   #7
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^^^there's the test
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