P1107

CIRCUIT DESCRIPTION
The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure which gives an indication of the engine load. The MAP sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The Powertrain Control Module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit and provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the signal circuit which is relative to the pressure changes in the manifold. With low manifold absolute pressure such as during idle or deceleration, the PCM should detect a low MAP sensor signal voltage. With high manifold absolute pressure such as ignition ON, with the engine OFF or Wide-Open Throttle (WOT), the PCM should detect a high MAP sensor signal voltage. Certain vehicle models will also use the MAP sensor in order to calculate the Barometric Pressure (BARO) when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at wide-open throttle. 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 intermittently low DTC P1107 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0121, P0122, or P0123 are not set.
^ The throttle angle is more than 6 percent when engine speed is more than 1,000 RPM.

CONDITIONS FOR SETTING THE DTC
MAP sensor voltage is intermittently less than 0.1 volts.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store the conditions which were present when the DTC set as Failure Records data.

CONDITIONS FOR CLEARING THE DTC
^ A 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
^ Inspect the MAP sensor vacuum source for leaks, restrictions or poor connections.
^ If the intermittent condition exists refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-12:

The number below refers to the step number in the diagnostic table.
4. Many intermittent open or shorted circuits come and go with harness/connector movement caused by vibration, engine torque, and bumps. This step attempts to recreate this condition.