Code P0108, Map Sensor CKT - "S" & "T" Series 4.3L (VIN W): Notes

Manifold Absolute Pressure (MAP) sensor responds to changes in manifold pressure (vacuum). Control module receives this information as a signal voltage that varies from 1-1.5 volts at idle to 4-4.6 volts at full throttle. If MAP sensor fails, control module will substitute a fixed MAP value and use throttle position sensor to control fuel delivery.

1. Rough, unstable or incorrect idle and low manifold vacuum must be corrected before using chart.
2. This simulates conditions for Code P0108. If control module recognizes change, control module and circuits are okay.