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Home >> Dodge and Ram >> 1992 >> Dakota 4WD V8-318 5.2L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Manifold Pressure/Vacuum Sensor >> Testing and Inspection
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Manifold Pressure/Vacuum Sensor: Testing and Inspection


MAP Sensor Test:






NOTE:
To perform a complete test of MAP sensor and its circuitry, refer to appropriate Powertrain Diagnostic Chart. To test the MAP sensor only, refer to the following:


PROCEDURE

1. Inspect the rubber nipple (fitting) from the 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.

2. Test the MAP sensor output voltage at the MAP sensor connector terminal 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 Engine Controller (terminal/pin-5) for the same voltage described above to verify the wire harness condition. Repair as necessary.

4. Test MAP sensor supply voltage at sensor connector terminal C with the ignition ON.

^ The voltage should be approximately 5 volts (±O.5V). Five volts (±0.5V) should also be at terminal 6 of the Engine Controller wire harness connector. Repair or replace the wire harness as necessary.

5. Test the MAP sensor ground circuit at sensor connector terminal A and Engine Controller connector terminal/pin-4. Repair the wire harness if necessary.

6. Test the MAP sensor ground circuit at the Engine Controller connector between terminal/pin-4. and terminal/pin-11 with an ohmmeter.

^ If the ohmmeter indicates an open circuit, inspect for a defective sensor ground connection. If the ground connection is good, replace the Engine Controller. If terminal/pin-4. has a short circuit to 12 volts +, correct this condition before replacing the Engine Controller.
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