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Old 03-22-2004, 12:23 AM   #1
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Default QDM Fault, what tha?

My SES light has been coming on and off constantly going down the road but will not stay on. whenever my son goes to scan my car, it shows no current codes but in the history codes it says that there is a QDM fault. What is that and how can i fix this and get my light to go off. i guess Jeff could undo my battery like usual but i was hoping for some good input here!!!
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Old 03-22-2004, 12:59 AM   #2
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What is the code number?
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Old 03-23-2004, 08:20 PM   #3
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code 26 QDM Fault
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Old 03-23-2004, 08:45 PM   #4
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That'* Quad-Driver A. On the 93 it applies to the charcoal canister purge solenoid, high temperature lamp, low speed fan relay, brake switch, and the torque converter clutch apply solenoid. The PCM is detecting improper voltage on one of those circuits.
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Old 03-23-2004, 11:02 PM   #5
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how would one go about checking all that stuff????????!!!!!!!
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Old 03-23-2004, 11:38 PM   #6
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I would look at the wiring to each of those devices to see if it looks broken anywhere. Other than that the diagnostic is pretty complicated, and you need a dealer service manual for it.

Sometimes you can identify the problem by paying attention to the devices to see if they are functioning properly.
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