Code 32 - EGR System Failure: Notes

The integrated electronic EGR valve is a sealed unit which functions similar to a port valve with a remote vacuum regulator. The internal solenoid is normally open, which causes the vacuum signal to be vented to atmosphere. The EGR valve contains a built-in voltage regulator which modifies ECM signals to provide different amounts of EGR flow by regulating the current to the internal solenoid. The ECM controls EGR by varying a pulsed signal to turn on and off the EGR valve many times a second. This system also contains a pintle position sensor which works similar to a TPS. As EGR flow increases, pintle signal will increase. Code 32 will set if EGR pintle position does not match duty cycle or if coolant temperature is greater than a specified amount and no EGR signal is detected.

1. Whenever the solenoid is de-energized, the solenoid valve should be closed, which should not allow the vacuum to move the EGR diaphragm. If the filter is plugged, however, vacuum applied with the hand-held vacuum pump will cause the diaphragm to move because vacuum will not be vented to the atmosphere.
2. Test determines if EGR filter is plugged or if the EGR itself is faulty. Use care when removing the filter to avoid damaging the EGR assembly.
3. If the valve moves in this test, it is probably due to circuit No. 435 being shorted to ground.
4. Grounding the diagnostic "test" terminal should energize the solenoid, which closes off the vent and allows vacuum to move the diaphragm.
5. The EGR assembly is designed to have some leakage and therefore, 7 in. Hg is all that should be able to be held on the assembly, however, if too much of a leak exists (less than 3 in. Hg holding), the EGR assembly is leaking and must be replaced.