Map sensor voltage too low? - Dodge Cummins Diesel Forum

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post #1 of 4 (permalink) Old 02-24-2012, 09:16 AM Thread Starter
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Map sensor voltage too low?

My check engine light has been on and I plugged my Smarty in and it said the map sensor voltage too low. Does anybody know what that means and what I can do to fix it

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post #2 of 4 (permalink) Old 02-24-2012, 09:50 AM
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What was the specific trouble code?

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post #3 of 4 (permalink) Old 02-24-2012, 10:07 AM Thread Starter
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That's what it came up as..

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post #4 of 4 (permalink) Old 02-24-2012, 11:50 PM
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Voltage low is a short to ground or a shorted sensor. Voltage high would be an open circuit caused by a bad connection, broken wire or bad sensor.

If you ever have current faults (I don't know if cummins uses them). Current high or above normal is a short circuit and current low is an open circuit.

You can disconnect the sensor and see if the code changes. If it changes to voltage high with the sensor unplugged the sensor is bad. If the code doesn't change you have a wiring issue.

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Last edited by CoalRoller; 02-24-2012 at 11:54 PM.
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