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Home >> Chevrolet >> 1987 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Tests W/Codes - 5.7L) >> Trouble Code Charts >> Code 32, EGR Circuit Error - Models Using Manifold Vacuum, 2-Terminal Solenoid & BACKPRESSURE EGR >> Notes

Code 32, EGR Circuit Error - Models Using Manifold Vacuum, 2-Terminal Solenoid & BACKPRESSURE EGR: Notes

WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.

PCM controls a solenoid regulating vacuum to EGR valve. Normally closed solenoid prevents vacuum from passing until it is energized by PCM. A properly operating EGR will directly affect fuel integrator counts. With EGR valve open, integrator counts will be less than without EGR operation. If monitored integrator counts do not change with EGR commanded, Code 32 will set.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. EGR valve should open when vacuum is applied to solenoid. Vacuum should hold.
  2. When Tech 1 energizes EGR solenoid, vacuum to EGR valve should bleed through a vent in solenoid and EGR valve should close. Vacuum gauge may or may not bleed off vacuum. However, this does not indicate a problem.
  3. Determines if fault lies in electrical control part of system, connector or solenoid.
  4. This system uses a negative backpressure EGR valve. Valve should hold vacuum with engine off.
  5. When engine is started, backpressure should cause vacuum to bleed off and valve should fully close.
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