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Test NTC-6A - Checking Map Sensor Calibration

  1. Turn engine off. Install vacuum "T" in MAP sensor vacuum hose. Install vacuum gauge. Start engine, and let it idle. Using DRB, read MAP gauge. If reading is within one in. Hg of vacuum gauge reading, MAP sensor is functioning properly. Test is complete. If reading is not within one in. Hg of vacuum gauge reading, turn engine off.
  2. Disconnect vacuum gauge from MAP sensor vacuum hose. Connect an auxiliary vacuum pump to MAP sensor. Apply 5 in. Hg to MAP sensor. Using DRB, read and record MAP sensor voltage. Increase vacuum to 20 in. Hg. Read and record MAP sensor voltage. Subtract voltage recorded at 20 in. Hg from voltage recorded at 5 in. Hg.
  3. If difference is 2.3-2.9 volts, repair restriction in vacuum hose to MAP sensor. Perform TEST VER-2. If voltage difference is not 2.3-2.9 volts, replace MAP sensor. Perform TEST VER-2.
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