DTC P0108 - MAP SENSOR CIRCUIT HIGH 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 pressure changes within intake manifold to indicate engine load. MAP sensor is mounted on top of intake manifold. MAP sensor has a 5-volt reference circuit, ground and a signal circuit.

MAP sensor voltage (depending on altitude) can range from 1.0-1.5 volts at idle (high vacuum) to 4.0-4.9 volts at wide open throttle (low vacuum). When PCM senses a signal voltage higher than normal operating range of sensor, DTC will set.

DTC will set when following conditions are present

1. DTCs P0122 or P0123 not set.
2. Engine operating.
3. With engine speed less than 1000 RPM, TP sensor angle zero percent.
4. With engine speed more than 1000 RPM, TP sensor angle less than 3 percent.
5. MAP voltage more than 4.2 volts.
6. Conditions met for 3 seconds.