Sensor Test

Fig 25 Sensor Location-Typical:

To perform a complete test of MAP sensor (Fig. 25) and its circuitry, refer to Powertrain Management/Computers and Control Systems/Testing and Inspection.
Testing and Inspection

To test the MAP sensor only, refer to the following:

Fig. 26 Rubber L-Shaped Fitting-Map Sensor-to-Throttle Body:

1. Inspect the rubber L-shaped fitting from the MAP sensor to the throttle body (Fig. 26). Repair as necessary.

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

Fig. 27 Map Sensor Connector Terminals-Typical:

2. Test the MAP sensor output voltage at the MAP sensor connector between terminals A and B (Fig. 27). 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 powertrain control module (PCM) 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 (Fig. 27) 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 PCM wire harness connector. Repair or replace the wire harness as necessary.
5. Test the MAP sensor ground circuit at sensor connector terminal A (Fig. 27) and PCM connector A-4. Repair the wire harness if necessary.