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Old 03-10-2007, 12:00 PM   #1
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Default MAP sensor issue!

Hi, I just took my car to the shop yesterday to fix a vacuum leak(I wish they would have showed me where it was first) Anyway I was having some problems so I decided to take it there as a final straw just to get things in order. Well, everything seems to be ok but they were trying to explain the low voltage in the MAP sensor/BARO sensor. Can someone elighten me in laymans terms as to what this does or how to fix? I am good mechanically but electronically I am illiterate!! Thanks!!!
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Old 03-10-2007, 12:50 PM   #2
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Hopefully, this will help some.

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The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold vacuum. The MAP sensor signal voltage to the PCM varies from below 2.0 volts at idle to above4.0 volts with the key on and the engine not running, or the engine running at Wide Open Throttle (WOT) .

The MAP sensor is used to determine manifold pressure changes while the linear EGR flow test diagnostic is being run in order to determine the engine vacuum level for other diagnostics, and to determine Barometric Pressure (BARO) . The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP signal voltage that is excessively high, DTC P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage sets. If the PCM detects a MAP signal voltage that is excessively low, DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage sets.

The PCM also uses the MAP sensor for Throttle Position (TP) sensor performance. If the PCM detects a TP in an out of range condition when the MAP reading is above or below a calibrated amount, DTC P0121 Throttle Position (TP) Sensor Performance sets.
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Old 03-10-2007, 02:00 PM   #3
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Do you think that by fixing the vacuum leak that this will resolve the issue? I really appreciate the feedback
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Old 03-10-2007, 02:09 PM   #4
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Considering the number of things that depend on normal MAP sensor operation, along with having a vacuum leak (and not recalling what all your issues were) it'* quite possible that fixing that could take care of your problems. Only time will tell for sure, but as it seems to be better, that'* a good start.
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