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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 ECF004 >> Circuit/System Description

Circuit/System Description

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Circuit Description
5V Reference Regulated voltage supplied by the control module.
Signal The control module input circuit has an internal resistance connected to ground.
Low Reference Grounded through the control module.
Component Description
B47 Fuel Pressure Sensor When the fuel pressure is low, the signal voltage is low. When the fuel pressure is high, the signal voltage is high.
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

The control module uses the fuel pressure sensor to constantly adjust the fuel pump's feed rate so that the ideal pressure is permanently maintained in the low pressure section (between the fuel pump and the high pressure fuel pump) by means of a closed loop control.

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