Code 32: EGR System Error: Notes

ECM controls a solenoid that regulates vacuum to the EGR valve. Solenoid is normally closed, preventing vacuum from passing until it is energized by ECM. A properly operating EGR will directly affect the MAP sensor signal. If EGR is commanded by the ECM and noticeable MAP sensor signal change is not observed, ECM will set a Code 32.

1. When test terminal "B" of the ALDL connector is grounded, EGR solenoid should be energized, allowing vacuum to the EGR valve. Vacuum should hold.
2. When jumper is removed from terminal "B", vacuum to the EGR valve should bleed through a vent in the solenoid. EGR valve should close. Vacuum gauge may or may not bleed off vacuum, however, this does not indicate a problem.
3. Determines if the electrical control part of the system is at fault or if connector or solenoid is at fault.
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.