Bosco49 Posted October 7, 2002 Share Posted October 7, 2002 Does anybody know what diagnostic # 26 refers to? The manual says "Quad driver module cirquit" , but then it doesn"t explain how to fix what-ever causes the ( service engine soon) light to come on. 1990 Riviera Link to comment Share on other sites More sharing options...
NTX5467 Posted October 8, 2002 Share Posted October 8, 2002 Hopefully you are looking in a GM Service Manual for 1990 Buicks as those pre-OBD codes could change from year to year for the same malfunction. Having a GM manual is critical in that aspect! Don't rely on some auto supply diagnostics either as they can be faulty.Once you verify the code and its malfunction mode, then you can seek out that circuit and see what sensors are involved with it and what they do. Then, if you had the Tech2 scan tool the dealership guys have, you could watch what the sensors are doing in "real time" instead of having to guess what they are doing. There are some things that unless you have the quality diagnostic tools and expertise, that it's cheaper and quicker to let the dealership guys do the work for you. That might not be the answer you are looking for, but it could well be the most expeditious in getting the car fixed and the Check Engine light extinguished.NTX5467 Link to comment Share on other sites More sharing options...
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