Code 32, EGR Circuit Error - "C" & "K" Series M/T: Notes

ECM controls a solenoid regulating vacuum to EGR valve. Normally closed solenoid prevents vacuum from passing until it is energized by ECM. 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.

1. When test terminal "B" of ALDL connector is grounded, EGR solenoid should be energized, allowing vacuum to EGR valve. Vacuum should hold.
2. SERVICE ENGINE SOON light should flash while ALDL test terminal is grounded. If light does not flash, this may be an indication that quad-driver has been damaged by low resistance in the TCC circuit.
3. When jumper wire is removed from terminal "B", 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.
4. Determines if fault lies in electrical control part of system, connector or solenoid.
5. This system uses a negative backpressure EGR valve. Valve should hold vacuum with engine off.
6. When engine is started, backpressure should cause vacuum to bleed off and valve should fully close.