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Test NF-5A - 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-II, read vacuum gauge. If DRB-II vacuum reading is within one in. Hg of teed-in vacuum gauge, test is complete. If DRB-II vacuum reading is not within one in. Hg of teed-in vacuum gauge, go to next step.
  2. Turn engine off. Disconnect vacuum gauge from MAP sensor vacuum hose. Connect an auxiliary vacuum pump to MAP sensor. Apply 5 in. Hg vacuum to MAP sensor. 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 vacuum from voltage recorded at 5 in. Hg vacuum.
  3. If difference is 2.3-2.9 volts, repair restriction in vacuum hose to MAP sensor. Perform VERIFICATION TEST VER-2  . If voltage difference is not 2.3-2.9 volts, replace MAP sensor. Perform VERIFICATION TEST VER-2  .
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