ECM/performance confusion!!! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-28-2008, 04:19 PM   #11
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Here'* the little bit that I know about the Quad drivers. There are two quad drivers & each controls up to 4 devices. The devices are usually solenoids & relays. Possibilities are:
EGR valve
Boost control solenoid
Evap puge solenoid
TCC solenoid & all the shift solenoids

Code 26 is for Quad driver A & code 56 is for Quad driver B. So getting the code number will help narrow this down. You'll need to check the resistance of all 4 devices controlled by that module. IIRC resistance should be in the 20-100 ohm range. If all 4 devices are in the correct range then the PCM is probably bad.
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Old 02-28-2008, 05:38 PM   #12
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The code number that was pulled was P0670. Quad Driver Module, QDM 4 Fault.
I recently had my transmission rebuilt so the sensors may or may not be a problem. It doesn't feel like the problem is in the transmission though because my engine chuggles/stutters. I guess I need to find out what components are related specifically to this driver and check them correspondingly.
Thanks
Josh

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Old 02-28-2008, 11:09 PM   #13
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How about P1670? 0670 doesn't exist.

P1670 QDM4 according to the 95 FSM:

Quote:
Will set when:
Engine is running
PCM detets improper voltage level on a circuit connected to QDM4
Above conditions are met for 5 seconds
Your 4 suspects are:

A/C relay
MIL (service engine soon light)
Low speed fan relay
High speed fan relay

If your MIL (SES) light comes on when it should, rule that out.

Is your AC working?

Do your fans work on high speed when the AC is on?

Does your low speed fan run when it shouldn't?
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Old 02-28-2008, 11:43 PM   #14
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I will check this stuff out first thing on Saturday. When we say high speed and low speed fan... Are we talking about the two fans behind the radiator? If so... I know that I opened my hood about a month ago to find so much snow packed into one of the fans that it was frozen tight. Did that short it out??? And I have noticed that even in some of this cold weather that the car runs about 220 degrees. I think these are the fans we are talking about. How does this cause my miss at WOT?

And one thing about my SES light is that I have that fuse pulled because of the brake warning light for the emergency brake. I used it once and the switch must have broke or gotten stuck so that even when I was driving it would chime and light up. The SES light was always on because or my PRNDL sensor. I tpulled a fault code for it but I didn't see how it affected my gear selection... everything worked fine.

Thank you very much for this information!!!!!!!!!!!!!!!!!!!!

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Old 02-29-2008, 04:51 AM   #15
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Alright... This is what I did tonight. I got the temperature to around 225 degrees and jumped out to see if the fans were running, both of them were. How am I supposed to see if my AC is working when it is cold outside? Is the smaller fan the low speed fan? And the larger one the high speed? How will I tell if they are running on high or low speed when my AC is on?

As said in my previous post, does it matter if I have the SES and other warning lights fuse removed because of the parking brake sensor that is stuck? And I still do not understand why this is messing with my engine performance and causing it to miss.

Thanks again,
Josh
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Old 02-29-2008, 09:01 AM   #16
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Read my post above. Any disruption in that circuit voltage will set that code. Your SES light is part of the circuit it checks.

Turn your AC on. Do the high speed fans come on? Does your AC compressor cycle on and off occasionally?

Sounds like it'* your fuse though. And it probably has nothing to do with how it'* running. That may be an entirely seperate issue.
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