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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1646 - Boost Control Solenoid 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 boost control solenoid, by supplying ground to device PCM is commanding on. ODMs can diagnose each circuit individually. If ODM "A" output 5 (boost control solenoid driver circuit) detects an improper voltage level, DTC is set.

Conditions for setting DTC: