How to check Map sensor
1. After locating the MAP sensor (using a service manual if necessary), disconnect its wiring harness
2. To test the MAP sensor, run jumper wires between its terminals and wiring harness per the service manual's instructions. Turn the ignition to the ON position and take a voltage reading. Spec for this MAP is about 4.5-5.0 volts.
3. With the engine running and warmed up, take another voltage reading. It should differ from the non-running number and fluctuate when the engine is revved. If not, verify that the vacuum line isn't damaged or blocked.
4. the vacuum line checks out, the sensor is likely faulty. Replace the bad MAP with a new one by connecting the vacuum hose and wiring harness, then securing the sensor to its factory location.
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