Your vehicle's MAP sensor plays a crucial role in keeping it performing at its best. Here's how it works and the warning signs that it might be failing.

Test for voltage at the plug connector as indicated in the photos and captions, and make sure the vacuum line to the MAP sensor isn't kinked, crushed, or leaking.

To test for proper signal voltage with a DVOM, the MAP sensor must be connected to the wiring harness. This test is best performed with the key in the On (engine off) position and a vacuum pump ...