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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (1 Of 5)) >> Diagnostic Information and Procedures >> DTC P0186, P0191-P0193, P127C, or P127D >> 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
5 V Reference - Terminal 1 Regulated voltage supplied by the control module.
Signal - Terminal 2 The control module input circuit has an internal resistance connected to 5 V.
The fuel rail pressure sensor 2 uses the same signal circuit as the fuel rail temperature sensor.
Signal - Terminal 4 The control module input circuit has an internal resistance connected to 5 V.
Low Reference - Terminal 3 Grounded through the control module.
Component Description
B47B Fuel Rail Pressure Sensor The pressure sensor generates an analog signal output proportional to a pressure input and the reference voltage.
The sensor is equipped with two sensors. The primary output of the sensor is used for pressure, while the second output has two functions pressure & temperature.
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.