Questions and Answers
Saturn EGR Testing
Q. Mr. Ciulla: I find the information you provide on the web to be very informative. I was just reading a reply you gave to a fellow about how to replace his EGR Valve. Sounds simple enough, in fact I've done most of the repair work on my cars, so I know my way around pretty well.
I was wondering if you could explain how to test the EGR valve to verify if it is in fact faulty. I was getting a SES light and when I pull the codes out I got a 32, and a couple others 26 (Quad driver) and 42 (bypass circuit) which I will also have to address, but I figured I'd tackle the EGR first. Anyway, the Chilton's repair manual doesn't really get into great detail about the trouble codes and how to diagnose the problem.
Hoping you could shed a little light down on me.
Thanks,
JohnA. General Motors uses a Linear EGR (LEGR) system that is, in my opinion, much more complicated then it has to be. Obviously the engineers who designed this system have never heard of the K.I.S.S. principle.
Basically a DTC 32 will set if the L-EGR pintle position voltage is ever below 0.10 volts and if the actual voltage does not closely match desired voltage after 25 seconds (10% or 26 counts.) Coincidentally the DTC 26 is related to this.
The best way to test the L-EGR is to replace it with a known good valve, clear the codes and trying it. Otherwise you will need a scan tool and a very long diagnostic flow chart to pinpoint the problem.
Additional Information provided courtesy of ALLDATA
