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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 03-22-2004, 10:55 PM   #1
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Does anyone have any circuit information on what the ECM quad driver QDM3 controls on a '95 SE?

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Old 03-22-2004, 11:48 PM   #2
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I don't see a number 3 driver in the book. What code number are you getting?
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Old 03-22-2004, 11:58 PM   #3
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It'* not a code, per se -- I'm looking at the ALDL data itself (mode 1, message 0 ECM response). Byte 57 is the "IOD port A input mode word," and bit 6 apparently corresponds to QDM3 normal/fail. It isn't throwing an error code, so I'm just curious if I'm misinterpreting the data, if this particular error doesn't throw a code, or what.

But all the datastreams specs I've seen list it as QDM3 -- they list 5 of them altogether, from 1 to 5.

Maybe it'* called QDM C instead of 3?

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Old 03-23-2004, 12:09 AM   #4
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There may be five, but the dealer manual says that the Tech 1 tool only recognizes QDM 1, 2, and 4.
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Old 03-23-2004, 12:15 AM   #5
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Then I'll ignore 3 and 5 Solves that problem rather nicely.

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Old 03-23-2004, 12:30 AM   #6
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Oh, for future reference -- what do QDMs 1, 2, and 4 control?

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