if a diagnostic test shows quad driver failure?

  • Thread starter Thread starter Linda S
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Linda S

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on a 1996 pontiac bonneville does this mean that it is the computer/electronic control module is bad or does n e one know where the quad driver is located or if it is part of the computer
Please help.......
i ask the mechanic and he never really gave a straight answer that is one reason i am asking on here and i am trying to make sure that i am not being taken advantage of as a female...as that seems to happen quite often
 
The quad driver has 4 outputs that controls various elctromechanical devices. Normally there are at least two quad drivers controlling 8 devices. The quad driver is part of the PCM/ECM module. Because of the possibility of a solenoid to short internally, the quad driver is the internal protection to prevent damage to the PCM/ECM.

Code 26 is very common with a quad driver failure. It could be one of several relays, sensors or solenoids or even the PCM. However, normally the faillure is caused by one of the devices controlled and not the quad driver.

It could be A/C relay, coolant fan relay, EGR valve solenoid, evaporative purge solenoid, TCC solenoid, etc. Basically you will need to troubleshoot the respective electrical component(s) in any of those given circuits. To start I'd check into the EGR valve.

I am moving this thread back to the Achieva subforum. Good luck!
lilrogue78
 
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