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Test NTC-9: Checking Manifold Absolute Pressure (Map) Sensor

  1. Ensure engine is off. Install vacuum "T" fitting and vacuum gauge at vacuum source on intake manifold. Start engine and allow engine to idle. If engine will not idle, maintain a constant RPM above idle.
  2. Note engine vacuum on vacuum gauge. Using scan tool, read MAP sensor vacuum. If MAP sensor vacuum is within one in. Hg of engine vacuum on vacuum gauge, MAP sensor is operating properly. Test is complete. If MAP sensor vacuum is not within one in. Hg of engine vacuum on vacuum gauge, replace MAP sensor. On 4.7L, MAP sensor is located on front of intake manifold. See Figure . On 5.2L and 5.9L, MAP sensor is located on side of throttle body. See Figure . On all models, perform TEST VER-5  .
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