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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> Proactive Alert Identifier ECF002 >> Circuit/System Description

Circuit/System Description

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Circuit Description
Control The output circuit is switched to 12 V to activate the component.
Low Reference Fuel Pump Low Reference
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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