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Home >> Buick >> 1991 >> Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Locations >> Quad Driver Module

Quad Driver Module

The Quad Driver Modules (QDM's) are hard wired inside the ECM.

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