Checking Map Sensor

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NOTE: For circuit identification and wiring diagram, see WIRING DIAGRAMS article. After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-2 under VERIFICATION TESTS to ensure system is functioning properly.

Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and let it idle. If engine will not idle, maintain a constant RPM above idle. Using scan tool, monitor MAP sensor vacuum. If scan tool reading is within one in. Hg of vacuum gauge reading, test is complete. If scan tool reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor.