P1106

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 intermittently high, DTC P1106 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0121, P0122, or P0123 are not set.
^ The engine has been running for a length of time that is determined by the start-up coolant temperature. The length of time ranges from 2 minutes at less than -30°C (-22°F) to 1 second at more than 30°C (86°F).
^ The throttle angle is less than 2 percent when the engine speed is less than 1,500 RPM.

Or

^ The throttle angle is less than 10 percent when the engine speed is more than 1,500 RPM.

CONDITIONS FOR SETTING THE DTC
The MAP sensor signal voltage is more than 4.2 volts for 20 seconds.

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 4-14:

The numbers below refer to the step numbers on the diagnostic table.
4. The fault is currently not present. Many intermittent open or shorted circuits come and go with harness and connector movement that is caused by vibration, engine torque, and bumps. This step attempts to recreate the fault which set the DTC.
6. This step tests the 5-volt reference circuit for a short to voltage, and tests the low reference circuit for an open.