Component Test

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR TEST

Fig. 25 Sensor Location:

To perform a complete test of Manifold Absolute Pressure (MAP) sensor (Fig. 25) and its circuitry refer 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 rubber L-shaped fitting from MAP sensor to 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 MAP sensor output voltage at MAP sensor connector between terminals A and B (Fig. 27). With ignition switch ON and 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 same voltage described above to verify wire harness condition. Repair as necessary.

4. Test MAP sensor supply voltage at sensor connector between terminals A and C (Fig. 27) with 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 wire harness as necessary

5. Test the MAP sensor ground circuit at sensor connector terminal-A (Fig. 27) and PCM connector A-4. Repair wire harness if necessary.

Refer Wiring Diagrams for cavity locations.