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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P2635 >> 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.
Low Reference Grounded through the control module.
Component Description
A7 Fuel Pump and Level Sensor Assembly Pump Motor 
The fuel pump has a DC motor that is controlled by a PWM signal to achieve the desired fuel pressure.
Sensor 
A float in the fuel tank is attached to a potentiometer-type variable resistor. The voltage drop over this resistor is used by the fuel gauge in the instrument cluster.
K111 Fuel Pump Driver Control Module The control module contains a microprocessor used to process input data to control outputs.
The control module communicates with the engine control module via serial data.

When the ignition is turned On, the ECM sends a 12 V signal to the control module K111 to enable the fuel pump. If the engine is not started, the control module K111 turns the fuel pump Off after 6 s.

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