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Home >> GMC >> 1999 >> Forward Control 7.4 J >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P1537-U1193 >> DTC P1673 >> DTC P1673: Engine Hot Light Control Circuit (3.8L "G" Body) >> 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 by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM output (ENGINE HOT light indicator driver circuit) detects an improper voltage level, DTC will set.

Conditions required to set DTC are, ignition is on, an improper voltage level has been detected on ENGINE HOT light indicator driver circuit and conditions are present for at least 20 seconds.