DTC P1107 - MAP SENSOR CIRCUIT INTERMITTENT LOW 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 5-volt reference 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. Engine is running.
2. TP is zero percent or greater when engine speed is not greater than 800 RPM.
3. TP is 12.5 percent or greater when engine speed is greater than 800 RPM.
4. No TP sensor DTCs are set.