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Dodge Repair/'91 dodge 1/2ton 2wheel drive 5.2l

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Question
The code reader says map sensor input voltage above max voltage and
Open detected on idle air control valve why??

Answer
Hi Chris,
I would inspect the wiring harness for the MAP sensor and for idle air control valve for any sign of the insulation being melted or damaged. A short between the operating voltage and the signal wire (for the MAP) or between the wires of the valve could cause theses fault codes. If the harnesses appear in good condition, then I would suspect that the MAP sensor has gone off-value and needs to be replaced. The idle air control valve's wires should be checked between the plug and the engine control module. Unfortunately I don't have the wiring diagrams for the trucks of that decade. You might check the Autozone website to see if they might show those diagrams.
Please read the PS (below) and respond to it.
Thanks for doing that,
Roland

Dodge Repair

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Roland Finston

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Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question or asleep overnight so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top expert" from 2010-2015 here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Degrees in Physics/bruised knuckles.

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014, and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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