P0105

DTC P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction





CIRCUIT DESCRIPTION
By a built-in sensor unit, the manifold absolute pressure sensor detects the intake manifold pressure as a voltage. The ECM then determines the basic injection duration and basic injection advance angle based on this voltage. Since the manifold absolute pressure sensor does not use the atmospheric pressure as a criterion, but senses the absolute pressure inside the intake manifold (the pressure in proportion to the present absolute vacuum 0), it is not influenced by fluctuations in the atmospheric pressure due to high altitude and other factors. This permits it to control the air-fuel ratio at the proper lever under all conditions.





DETECTING CONDITION





If the ECM detects DTC "P0105" it operates the fail-safe function, keeping the ignition timing and injection volume constant and making it possible to drive the vehicle.





WIRING DIAGRAM

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INSPECTION PROCEDURE

HINT: If DTC "P0105" (Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction), "P0110 (Intake Air Temp. Circuit Malfunction), "P0115" (Engine Coolant Temp. Circuit Malfunction, "P0120" (Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction) are output simultaneously, E2 (sensor ground) may be open.