Po108 service code - MPV Mazda Cars & Trucks

Hi,
OBD II Fault Code

• OBD II P0108

• Check Engine Light will illuminate
• In many cases, no abnormal symptoms may be noticed
• In some cases, the engine may be hard starting and/or get poor fuel economy
• In some cases, noticeably poor engine performance may occur

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is defective
  
• Intake Manifold vacuum leaks
• Faulty or corroded Manifold Absolute Pressure Sensor/Barometric Pressure wiring or connections

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is an Intake Manifold vacuum leak
  
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is a stuck-open EGR Valve
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real problem is a defective Idle Air Control Motor, which causes a very low engine idle

Diagnostic Trouble Code (DTC) P0108

Manifold Absolute Pressure Sensor High Voltage

• In unison with the Manifold Absolute Pressure (MAP) sensor, the engine control module (ECM) regulates the flow of fuel and the ignition timing.
• The MAP sensor which is metric pressure enables the ECM to make necessary adjustments for differing altitudes.
• The output voltage of the MAP sensor changes with the change in the manifold pressure.
• The intake manifold pressure created due to engine load (intake manifold vacuum) and the rpm changes is measured by the MAP sensor and transformed into voltage outputs.
• The ECM notes the manifold pressure by keeping a vigil on the MAP sensor output voltage.
• The MAP sensor directly receives a 5 volt-reference voltage sent to it by the ECM.
• At idle, about 1.0 to 1.5 volts indicates a low-pressure (low voltage) output voltage.
• At wide open throttle (WOT) about 4.5 to 4.8 volts indicates higher pressure (high voltage) output voltage.