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Home >> Oldsmobile >> 1998 >> Silhouette GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1651 - Fan 1 Relay Control Circuit >> Circuit Description
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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. If ODM "B" output 1 (fan 1 relay driver circuit) detects an improper voltage level, P1651 is set.

Conditions required to set DTC are:

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