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98 Lumina 3.1 - P1671 Driver 4 Line 1, code?94Z28Conv. 12-01-2008, 04:05 PM Does anyone know what this code is caused by, the car has no change in the running when this code trips. Thank You all in advance Blue Bowtie 12-01-2008, 10:41 PM I tried to find schematics for the 16196285 PCM, but failed. The trouble code is indicating that an output module is in fail mode, most likely due to a shorted output/load. It may be for something which does not directly affect engine operation, such as a purge solenoid, O² heater, some relay driver such as A/C compressor, or similar. A good schematic will show the intended use of that output on your particular vehicle. vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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