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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P146B >> 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: Evaporative Emission Control System Description

Component Description
G58 Evaporative Emission Purge Pump The assembly contains the following components:
  • EVAP Purge Pump - The pump is driven by a 12 V DC motor.
  • EVAP Purge Pump Pressure Sensor - The sensor measures the pressure in the component: Evaporative Emission (EVAP) Purge System
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.
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.

This diagnostic tests if the evaporative emission (EVAP) purge pump pressure is greater than or less than a calibrated threshold. The pressure fail threshold is calculated as a function of purge valve duty cycle and barometric pressure.

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