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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
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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
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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
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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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Old 10-12-2022, 06:29 PM   #8
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Well, after testing the original MAF, it started working again....new-made MAF still doesn't work.
The mystery continues and I'm pretty confused, but I'll quell my curiosity until it rears it's head again.
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Old 10-12-2022, 08:52 PM   #9
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Did you check the terminal tension (drag test)?

Fretting can cause a poor connection. Cycling the connector can be enough to knock off some of that microscopic corrosion.

Always backprobe if you don't have the proper test probe. You can get away with light front probing as long as you don't go stuffing a lead in there and spreading the terminal causing poor terminal tension.

Last edited by ZVOLV; 10-12-2022 at 08:57 PM..
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Old 10-21-2022, 02:33 PM   #10
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I removed the rubber cover from the top of the connector to test the terminals and checked that they were seated properly.

It recently stalled when I stepped on the gas pedal from idle at a traffic light.
Started right on up again and have not been able to repeat the issue.
The car is now throwing a 2-3-2 code (too rich/lean at idle).

Is this connected to the MAF, or something else? (O2 sensor was replaced last year as well as many intake hoses)
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Old 10-22-2022, 04:13 PM   #11
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A 232 code was the fake code that a defective 561 ecu would set in my mothers 90 245. If the code is for real then it's usually caused by intake air leaks like a bad intake gasket, the hose from the mass air sensor to the throttle body, or a split vacuum hose somewhere.
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