This article will show you a very accurate way to diagnose a Manifold Absolute Pressure (MAP) Sensor Diagnostic Trouble Code P0108, P0109 or a bad MAP Sensor with a multimeter and a Vacuum Pump.. The MAP Position Test is divided into three parts, and so to help you navigate this article, here are the contents of this article at a quick glance: MAP SENSOR TEST 1 MAP SENSOR TEST 2 MAP SENSOR TEST 3 MAP Code Will Not Go Away Symptoms of a BAD MAP How the MAP Sensor Works Also, this articles covers vehicle from Chrysler, Dodge, Plymouth, Eagle and Mitsubishi (2.0L, 2.4L, 2.5L, 3.3L, 3.8L) and to see if this article applies to your specific vehicle take a look at the Applies To container on the column on the left. If you need the Chrysler 4 wire MAP Sensor Test, go here: 4-wire MAP Sensor Test. You’ll find several Chrysler ‘How to Test’ articles by checking out the: Chrysler Index of Articles.