P0107

CIRCUIT DESCRIPTION
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:
^ 5-volt reference circuit
^ Low reference circuit
^ MAP sensor signal circuit

The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.

If the PCM detects a MAP sensor signal voltage that is excessively low, DTC P0107 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0122 or P0123 are not set.
^ The engine speed is less than 1,000 RPM.

OR

^ The engine speed is more than 1,000 RPM, the throttle position (TP) is more than 28 percent, and the pedal position is more than 1.2 percent.

CONDITIONS FOR SETTING THE DTC
The MAP sensor voltage is less than 0.2 volts for at least 6.25 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
^ The PCM will store the conditions which were present when the DTC set as Freeze Frame/Failure Records data.
^ A history DTC is stored.
^ The PCM will substitute a default MAP value to control the fuel delivery. The scan tool will not show the defaulted value.
^ The engine will operate in Open Loop when the vehicle is traveling under 8 km/h (5 mph).
^ The engine will operate in Closed Loop when the vehicle is traveling over 8 km/h (5 mph).

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the malfunction indicator lamp (MIL) OFF after three consecutive drive trips that the diagnostic runs and passes.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
^ The 5-volt reference circuits used by the various engine control components are internally connected in the PCM. If a component's 5-volt reference circuit is shorted to ground, the other 5-volt reference circuits may be affected.
^ Inspect the MAP sensor vacuum source for leaks, restrictions, or poor connections.
^ If an intermittent condition exists, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

DTC P0107 - Steps 1-2:

DTC P0107 - Steps 3-14:

The numbers below refer to the step numbers on the diagnostic table.
2. The MAP sensor 5-volt reference circuit is shared with other sensors. If DTC P1639 is set, this indicates that the 5-volt reference circuit is either shorted to ground or shorted to voltage and should be diagnosed first. The short may be on another sensor 5-volt reference circuit.
4. Operate the vehicle within the same conditions as when the DTC failed. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records can aid in locating an intermittent condition.