DTC P1107 - MAP SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE Pontiac Firebird IV

Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .

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 5-volt reference circuit at closed throttle (high vacuum). A high voltage signal, 4 volts is sent at wide open throttle (low vacuum).

Conditions required to set DTC are

1. No TP sensor DTCs set.
2. Ignition on.
3. TP angle steady and greater than 6 percent with engine speed greater than 1000 RPM.
4. MAP sensor intermittently indicates MAP at less than 2.8 psi (0.20 kg/cm 2 ).