LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Problems....need help what is this

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Old Jun 22, 2010 | 11:10 AM
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Default Problems....need help what is this

93 and just ran codes and got 28

fault Quad-Driver Module (QDM) #3 circuit
applies to:
- fan control relays
- a/c relay

What does this mean and why would fan relays cause this or is it the tranny?

thanks guys

Last edited by 93FireBirD; Jun 22, 2010 at 12:26 PM.
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Old Jun 22, 2010 | 11:18 AM
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You got that off my site. One column is for 94-95 and the right column is 93 only.

The quad driver is for your 93-not the transmission code. Check your fan relays/circuits and a/c relay/circuit.
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Old Jun 22, 2010 | 11:20 AM
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yes I did and I didnt know that, awesome. So it can be fan relays, a/c relays only correct?
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Old Jun 22, 2010 | 11:24 AM
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when I ran the codes it sounded like both fans were on and running hard/loud.

This dont really explain why my car runs like crap though. When I get on the car it feels very sluggish
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Old Jun 22, 2010 | 12:05 PM
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check your fuses if the fans are always on the car goes in safe mode thats why it may feel sluggish
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Old Jun 22, 2010 | 12:25 PM
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Originally Posted by old93camaro
check your fuses if the fans are always on the car goes in safe mode thats why it may feel sluggish
fans are not always on, I only heard them when I was running the codes. But I havent checked them while the car is running to make sure they function properly.
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