Code 28 on my 94
Thread Starter
Racer
Joined: Nov 2012
Posts: 263
Likes: 3
From: Philadelphia Pa
Code 28 on my 94
I have a code 28 coming up when i did a diagnostic on my car. It comes up as quad driver module number 3. Does anybody know what that is exactly? And my transmission isn't shifting right. Are the two problems connected?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
A quad driver turns on relays and solenoids. Usually you get a quad driver fault when something is shorted to ground.
You need to find out which relays and solenoids are associated with that quad driver and investigate.
You need to find out which relays and solenoids are associated with that quad driver and investigate.
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Don't know if this makes any sense:
Air conditioning Clutch relay and/or cooling fan relays. Check with digital Ohm meter, replace if less than 18 Ohms. If relays OK, potential ECM failure.
From this link:
http://www.corvettephotographs.com/c4vettes/ecm.htm
Air conditioning Clutch relay and/or cooling fan relays. Check with digital Ohm meter, replace if less than 18 Ohms. If relays OK, potential ECM failure.
From this link:
http://www.corvettephotographs.com/c4vettes/ecm.htm
