(28) Quad driver fault. How do I fix it?
Thread Starter
Burning Brakes
Joined: Nov 1999
Posts: 807
Likes: 0
From: Fort Wayne IN
(28) Quad driver fault. How do I fix it?
I get a check engine light and when I hook the diacom up to it I get a (28) Quad driver fault trouble code. What is it and how do I fix it? I think it has to do with the tranny. I have had it before as a trouble code but it never turned on the check engine light before??? Also I have a new 383 in it so it could be anything.
This is on a 93 6 speed vette
Thanks
Brad
[Modified by fstvette, 1:00 AM 9/21/2001]
This is on a 93 6 speed vette
Thanks
Brad
[Modified by fstvette, 1:00 AM 9/21/2001]
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: (28) Quad driver fault. How do I fix it? (fstvette)
I don't know code 28 nor do I have any data on it. Since an L98 ECM uses quad drivers to fire the fuel injectors and your injectors are batch fire too, I assume it works that way on your LT1.
I suggest you measure resistance of each injector to see if any are shorted or way off the 15Ohm value.
I suggest you measure resistance of each injector to see if any are shorted or way off the 15Ohm value.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Re: (28) Quad driver fault. How do I fix it? (65Z01)
Quad drivers are used to drive several high power devices under the hood. You really need to get the GM manual for this one since you will need to review the circuit for the particular quad driver in question. I get this error code occasionally on my daughter's Bonneville. I believe the TCC lock-up solenoid is actuated by a quad driver, but to be sure you need to get the manual. Maybe someone with a manual can chime in here with the diagnosis chart.
Thread Starter
Burning Brakes
Joined: Nov 1999
Posts: 807
Likes: 0
From: Fort Wayne IN
Re: (28) Quad driver fault. How do I fix it? (Ramrod92)
yes the 1-4 is disconnected, but I have the resistor which I thought was suppose to trick the computer?. I will stop by the chevy dealer and see what they say. thanks everyone. If anyone else has anymore suggestions please reply.
Thanks
Brad
Thanks
Brad
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: (28) Quad driver fault. How do I fix it? (fstvette)
I have had the 28 and I think it was due to a poor connection at the optispark. Check the wiring.
Melting Slicks
Joined: Jul 1999
Posts: 2,875
Likes: 0
From: Olive Branch (Memphis suburb) MS
Cruise-In II Veteran
Re: (28) Quad driver fault. How do I fix it? (fstvette)
Brad, the code 28 involves the #3 circuit which involves the A/C clutch relay and the 2 cooling fan relays. Might want to check those. :confused:
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Burning Brakes
Joined: May 2001
Posts: 790
Likes: 2
Re: (28) Quad driver fault. How do I fix it? (Ramrod92)
I'm having exactly the same problem with my 92. If you find out what it is, please to drop me a line at dslater@email.com. I was told by the chevy dealer that there are 5 relays that can cause it and that one of them has overloaded the ecm circuit and that I may need a new ECM...but only after I figured out what caused it in the first place.
