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code 56 What does it mean?

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Old Oct 23, 2016 | 01:36 PM
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code 56 What does it mean?

1988 F250 5.0L maunal trans 193K miles
On KOEO I'm getting code 56 which the book say is "MAF circuit above max voltage".
What does that mean and what can I do about it?
I'm also getting other codes, but this is first.
 
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Old Oct 23, 2016 | 01:38 PM
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OBTW, truck runs fine, gets maybe 20 mpg highway
 
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Old Oct 23, 2016 | 03:54 PM
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An '88 is speed density and doesn't have a mass air sensor. Is it possible you read the code wrong?
 
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Old Oct 23, 2016 | 04:42 PM
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Yup - did it at least twice - got the same code each time. Also got 67 "NDS circuit open with A/C on during set test" and 85 "Cannister Purge circuit failure" and some more that look like auto trans code.
All appear to be repeatable. I haven't don KOER.
 
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