See Figure 1
The Manifold Absolute Pressure (MAP) sensor measures the pressure in the intake manifold and sends a variable frequency signal to the Engine Control Module (ECM). When the ignition is ON and the engine OFF , the MAP sensor will indicate the barometric pressure in the intake manifold.
- Connect MAP/BARO tester to the sensor connector and sensor harness connector. With ignition ON and engine OFF , use DVOM to measure voltage across tester terminals. If the tester's 4-6V indicator is ON, the reference voltage input to the sensor is okay.
- If the DVOM voltage reading is as indicated in the table, the sensor is okay.