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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1568 (Engine Controls Diagnostic (DTC P0172 To DTC P0455) -- 5.7L) >> Diagnosis >> DTC P0412 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Voltage is supplied to the secondary air injection (AIR) solenoid by the ignition 1 voltage circuit. The powertrain control module (PCM) supplies the ground path to the solenoid by an internal integrated circuit called an output driver module (ODM). One of the ODM output circuits is configured to operate as a low side driver for the solenoid. The low side driver also incorporates a fault detection circuit, which is continuously monitored by the PCM. When the PCM completes the ground circuit to the solenoid, engine vacuum is applied to the AIR shut-off valve. If the PCM detects a low voltage on the control circuit when the solenoid is commanded OFF, or a high voltage when the solenoid is commanded ON, DTC P0412 sets.

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