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Posted

crucial for what? everything works just fin in my car, every one says replace the ecm but no one can tell me what the quad driver circuit is. (I am thankful for the advice and any help anyone can give me)

Posted

The Quad driver in the ECM has 4 drivers and will bring up a code 26 when the ECM sees a problem in any of the following circuits. Canister purge, SES light, Low speed fan, high speed fan, A/C relay, Hot light, TCC solenoid or any of the 3 EGR solenoids. This is a simplistic answer for what the Quad driver does. There are 4 pages of diagnostics for this code in the shop manual.

My car also is occasionally bringing up this code and I also will have to look into it one day.

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