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Home >> Oldsmobile >> 1989 >> Cutlass Calais Base, 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.3L PFI Tests W/Codes >> Diagnosis & Testing >> Chart C-1D, Map Output Check

Chart C-1D, Map Output Check

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Checks MAP sensor output voltage to ECM. This voltage, without engine running, represents a barometer reading to ECM.
  2. Applying vacuum to MAP sensor should cause voltage to be 1.2-2.3 volts less than voltage at step 1). Upon applying vacuum to sensor, change in voltage should be instantaneous. A slow voltage change indicates a faulty sensor.
  3. Check vacuum hose to sensor for leaks or restriction. Ensure no other vacuum devices are connected to MAP sensor signal hose.
Fig 1: Chart C-1D Schematic, MAP Output Check
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Fig 2: Chart C-1D, MAP Output Check
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