What is a Quad driver?
Safety Car
Joined: Feb 1999
Posts: 3,504
Likes: 4
From: Mexico Beach FL
The Quad Drivers are part of the ECM in a '92.
They are not serviced separately from the ECM.
These drivers are essentially electronic amplifiers designed to be able to drive certain loads.
Tom Piper
They are not serviced separately from the ECM.
These drivers are essentially electronic amplifiers designed to be able to drive certain loads.
Tom Piper
Pro
Joined: Jul 2005
Posts: 741
Likes: 37
From: Athens, GA
Quad Driver
Here's a link to some general information about quad drivers ...
http://www.onsemi.com/pub/Collateral/NCV7601-D.PDF
Steven
http://www.onsemi.com/pub/Collateral/NCV7601-D.PDF
Steven
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
Originally Posted by quickcat
If I am getting a Quad Driver code would that indicate an ECM failure or is there a way to repair it.
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Originally Posted by quickcat
If I am getting a Quad Driver code would that indicate an ECM failure or is there a way to repair it.
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Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
My 93 got a code 28, then a 26, quad driver 3 & 1. You have to replace the ECM and trace down which sensor is sending a bad signal or is shorted. They are called quad drivers, because each one monitors 4 sensors. I had bad wiring to 2 sensors, hence the 2 codes.
Team Owner
Joined: Sep 2003
Posts: 25,295
Likes: 4
From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Getting a Quad Driver code does not mean the ECM is failing. I could just be the system that the QDM controls is failing. Most likley it is not an ECM failure. You need to get a service manual and look up the code.
Melting Slicks
Joined: Nov 2004
Posts: 2,799
Likes: 2
From: Cape Coral FL
QDM (quad driver module) faults are typically the result of one of the controlled circuits failing, which in a lot of cases does smoke the QDM in the ECM. Typical failures include solenoids shorting out, or a short to ground on the solonoid's circuit, which of course will kill the QDM. The best way to fix this is to have a factory service manual, with the appropriate high-impedence DVOM (digital volt/ohm meter) to properly diagnose the circuit in question before destroying a new ECM. This isn't a case of "throw an ECM at it" to fix it.
YMMV
YMMV
Thread Starter
Burning Brakes
Joined: Mar 2006
Posts: 891
Likes: 18
From: Dayton Ohio
That driver supplies the ground for both fan relays and the A/C clutch control relay. Check to see that these items are working.
They seem to be working fine, but I will do a more accurate test this afternoon.
Team Owner
Joined: Sep 2003
Posts: 25,295
Likes: 4
From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Originally Posted by quickcat
28 Quad Driver 3
