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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P0451-P0454 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to: Evaporative Emission Control System Description

Circuit Description
5 V 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
B150 Fuel Tank Pressure Sensor The pressure sensor is a 3 wire piezo-resistive pressure transducer.
The sensor measures the pressure in the component: Fuel Tank
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.
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