Note. For circuit reference, see WIRING DIAGRAMS article.
Circuit Description
Manifold Absolute Pressure (MAP) sensor measures changes in intake manifold pressure (vacuum). A low voltage signal, 2 volts, is sent to PCM on signal circuit at closed throttle (high vacuum). A high voltage signal, 4 volts, is sent at wide open throttle (low vacuum). DTC will set when PCM detects a MAP signal voltage that is excessively high.
For duplication of DTC, ensure no TP sensor related DTCs are present, engine is running, throttle position is less than 2 percent, engine speed is less than 3000 RPM, and MAP sensor signal voltage is greater than 4.3 volts.