DTC P0106: Map System Performance: Description

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Manifold Absolute Pressure (MAP) sensor responds to pressure changes in intake manifold. Pressure changes occur based on engine load. MAP sensor has the following circuits: 5-volt reference circuit, low reference circuit and MAP sensor signal circuit. Powertrain Control Module (PCM) supplies 5 volts to MAP sensor on 5-volt reference circuit. PCM also provides a ground on low reference circuit. MAP sensor provides a signal to PCM on MAP sensor signal circuit which is relative to pressure changes in manifold. PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. PCM should detect a high signal voltage at a high MAP, such as ignition is on, engine off, or at a Wide Open Throttle (WOT). MAP sensor is also used to determine Barometric (BARO) pressure. This occurs when ignition switch is turned on, engine off. BARO reading may also be updated whenever engine is operated at WOT. PCM monitors MAP sensor signal for voltage outside of normal range. PCM calculates a predicted value for MAP sensor based on throttle position and engine speed. PCM then compares predicted value to actual MAP sensor signal. DTC P0106 will set if MAP sensor signal is not within predicted range.