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, 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 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 signal voltage that is intermittently low, DTC P1107 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0121, P0122, or P0123 are not set.
^ The ignition is ON.
^ The throttle angle is more than 0 percent when the engine speed is less than 1,000 RPM.
Or
^ The throttle angle is more than 10 percent when the engine speed is more than 1,000 RPM.

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

ACTION TAKEN WHEN THE DTC SETS
^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The malfunction indicator lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, if equipped, may display a message.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC Last Test Failed clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Clear the DTC with a scan tool.

TEST DESCRIPTION

Steps 1-3:

Steps 4-12:

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