Code 32 - EGR System Failure (1988 Models): Notes

The ECM operates a solenoid to control the EGR valve. This solenoid is normally closed. By providing a ground path, ECM energizes solenoid, allowing vacuum to pass to the EGR valve. The ECM monitors EGR effectiveness by occasionally de-energizing the EGR control solenoid, shutting off vacuum to the EGR valve diaphragm. With EGR valve closed, manifold vacuum will be greater than it was during normal EGR operation. This change will be relayed to ECM by the MAP sensor. Code 32 will be set if the change is not within the calibrated window and vehicle speed is greater than 50 MPH, engine vacuum is between 8-13 in. Hg and no change in throttle position occurs while test is being run.

1. Checks for solenoid stuck open.
2. Checks for solenoid always energized.
3. Grounding ALDL "test" terminal should energize solenoid and vacuum should drop.
4. Negative backpressure valve should hold vacuum with engine off.
5. When engine is started, exhaust backpressure should cause vacuum to bleed off and valve to fully close.