Sensor Test

Fig 57 Manifold Absolute Pressure Sensor:

1. Inspect the rubber L-shaped fitting from the Manifold Absolute Pressure (MAP) sensor to the throttle body. Repair as necessary.

CAUTION: When testing the MAP sensor, be sure that the harness wires are not damaged by the test meter probes.

Fig 58 Rubber L-Shaped Fitting -- MAP Sensor-to-Throttle Body:

Fig 33 MAP Sensor Connector Terminals -- Typical:

2. Test the MAP sensor output voltage at the MAP sensor connector between terminals A and B. With the ignition switch ON and the engine OFF, output voltage should be 4-to-5 volts. The voltage should drop to 1.5-to-2.1 volts with a hot, neutral idle speed condition.
3. Test Jeep/Truck Engine Controller (JTEC) cavity A-27 for the same voltage described above to verify the wire harness condition. Repair as necessary.
4. Test MAP sensor supply voltage at sensor connector between terminals A and C with the ignition ON. The voltage should be approximately 5 volts (+/- 0.5V). Five volts (+/- 0.5V) should also be at cavity A-17 of the JTEC wire harness connector. Repair or replace the wire harness as necessary
5. Test the MAP sensor ground circuit at sensor connector terminal-A and JTEC connector A-4. Repair the wire harness if necessary.