DTC P0108 - MAP SENSOR CIRCUIT HIGH VOLTAGE GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Manifold Absolute Pressure (MAP) sensor measures changes in intake manifold pressure (vacuum). A low voltage signal, 1.0-1.5 volts, is sent to VCM on signal circuit at closed throttle (high vacuum). A high voltage signal, 4.0-4.5 volts, is sent at wide open throttle (low vacuum).

Conditions for setting DTC

1. No TP sensor related DTCs are set.
2. TP angle is not greater than 0.4 percent when engine speed is less than 1200 RPM.
3. TP angle is not greater than 20 percent when engine speed is greater than 1200 RPM.
4. MAP is 4.9 volts or greater.