Code 32, W Body, EGR System Error Using Tech I
Digital EGR valve controls EGR flow through 2 different sized orifices which are normally closed by pintles held down by springs. Orifice No. 1 is smaller than No. 2. Independent solenoids lift the pintles off of the seats when ECM allows current to flow through solenoids by providing a ground for the solenoid windings. Electric circuit problems should result in a Code 26 setting. ECM test EGR operating by quickly opening the EGR pintles during stable idle conditions and monitoring changes in the MAP sensor vacuum signal. If change does not occur, this test is repeated several times before setting Code 32. Test occurs so quickly that it should not be noticeable to driver.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Code 26 indicates an electrical problem is likely. This can be diagnosed using Code 26 chart.
- This step actuates each solenoid and should result in a momentary drop in RPM or engine roughness if EGR flows at idle. The No. 2 solenoid should have a greater effect than the No. 1 solenoid.