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 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. The PCM, also, 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. 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). Certain vehicle models will also use the MAP sensor 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 P0606, P1120, P1125, P1220, P1221, P1271, P1272, P1273, P1275, P1276, P1280, P1281, P1285, P1286, P1514, P1515, P1516, or P1517 are not set.
^ The engine has been running for a period of time that is determined by start-up coolant temperature. The 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 0.5 percent when engine speed is less than 900 RPM.

CONDITIONS FOR SETTING THE DTC
The MAP sensor signal voltage is more than 4.3 volts for 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM stores the DTC in history after the first failure but will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM records the operating conditions at the time the diagnostic runs and fails. The PCM stores the failure information as Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE DTC
^ 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.

TEST DESCRIPTION

Steps 1-4:

Steps 5-14:

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, by engine torque, and by 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.