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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0231, P0232, or P023F >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

For an overview of the component/system, refer to: Fuel System Description

Circuit Description
Control The output circuit is switched to 12 V to activate the component.
The output is PWM controlled.
Low Reference Grounded through the control module.
Component Description
G12 Fuel Pump The fuel pump has a DC motor that is controlled by a PWM signal to achieve the desired fuel pressure.
K111 Fuel Pump Driver Control Module The control module K111 monitors the fuel system for any condition which may adversely affect emissions. If a condition is detected it sets a DTC and sends a serial data message to the engine control module which then sets DTC P069E.

The control module K111 supplies the fuel pump with a PWM signal in order to achieve the desired fuel line pressure.

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