Manifold Absolute Pressure Sensor Circuit Range/Performance
What does P0106 mean?
The P0106 code means the vehicle's onboard diagnostic system has detected: Manifold Absolute Pressure Sensor Circuit Range/Performance. This is a serious severity code.
Common Symptoms
- Check Engine Light on
- Rough idle
- Hesitation or stumble
- Incorrect idle speed
- Poor fuel economy
Probable Causes (Ranked by Likelihood)
- Faulty MAP sensor Very High
- Vacuum leak at MAP sensor port or hose High
- Clogged MAP sensor vacuum port Moderate
- Wiring issue causing erratic signal Moderate
- Intake manifold leak Low
Step-by-Step Diagnostic Procedure
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At key-on/engine-off, MAP sensor voltage should read approximately 4.5-5V (atmospheric pressure). At idle it should drop to 1-2V.
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Check the vacuum hose connecting the MAP sensor to the intake manifold for cracks or loose fit.
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Clear the MAP sensor port with a short piece of wire. Carbon can clog the small opening.
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Monitor MAP sensor readings vs. expected values at different RPMs.
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Compare MAP to a known barometric pressure reading to verify calibration.
Frequently Asked Questions
What is the difference between MAP and MAF sensors?
A MAF sensor directly measures air mass flowing into the engine. A MAP sensor measures intake manifold vacuum and the ECU calculates air mass from that, engine speed, and temperature. Many modern engines use both.