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Home >> GMC >> 1989 >> Forward Control 4.8 T, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Code 32 - EGR System Failure (1 Of 2) >> Test Description

Test Description

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. With ignition on, engine off, solenoid should not be energized and vacuum should not flow to EGR valve. Grounding test terminal will energize the solenoid and vacuum should flow to EGR valve.
  2. Checks for plugged EGR passages. If passages are plugged, engine may have severe detonation on acceleration.
  3. The EGR solenoid will not be energized in Park or Neutral positions. This step will determine if the P/N switch input is being received by the ECM.
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