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Home >> Pontiac >> 1998 >> Firebird Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - 3.8L >> Diagnostic Trouble Codes >> DTC P1651 - Fan 1 Relay Control Circuit >> Circuit Description

Circuit Description

Output Driver Modules (ODM) are used by PCM to turn on current-driven devices needed to control various engine and transaxle functions. Each ODM can control up to 7 outputs, including fan 1 relay, by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually.

Conditions required to set DTC are: