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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Tests W/Codes - 5.2L CNG) >> Self-Diagnostic Tests >> Test NTC-7A - Checking Map Sensor Calibration

Test NTC-7A - Checking Map Sensor Calibration

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and operate at idle. If engine will not idle, maintain a constant RPM more than idle. Using scan tool, read Manifold Absolute Pressure (MAP) sensor vacuum.
  2. Compare scan tool vacuum reading with vacuum gauge reading. If readings are not within one in. Hg of each other, replace MAP sensor. Perform TEST VER-2. If readings are within one in. Hg of each other, MAP sensor is okay. Test is complete.
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