MotoLogic P0191, P0193, P127C, P127D User Manual

4/9/2021 DTC P0191-P0193, P127C, or P127D - 6.6L L5P • 2017 Chevrolet Silverado - 4WD • MotoLogic

https://www.motologic.com/car/2017_chevrolet_silverado_4wd_100305743/article/2017_chevrolet_silverado_4wd_100305743_061ff5f277d7d06be678

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DTC P0191

DTC P0192

DTC P0193

DTC P127C

DTC P127D

DTC P0191-P0193, P127C, or P127D - 6.6L L5P

Diagnostic Instructions

Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle

Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis

An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

Fuel Rail Pressure Sensor 1 Performance

Fuel Rail Pressure Sensor 1 Circuit Low Voltage

Fuel Rail Pressure Sensor 1 Circuit High Voltage

Fuel Rail Pressure Sensor 2 Circuit Low Voltage

Fuel Rail Pressure Sensor 2 Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit Short to Ground

Open/High

Resistance Short to Voltage

Signal

Performance

5 V Reference

P0193, P06A3,

P127D

P0193, P127D

P0193, P06A3,

P127D

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Fuel Rail Pressure Sensor 1 — Signal P0192 P0193 P0193 P0191

Fuel Rail Pressure Sensor 2 — Signal P127C P127D P127D P0191

Low Reference — P0193, P127D P0193, P127D P0191

Fuel Rail Pressure Sensor 1

Circuit Short to Ground Open Short to Voltage

Operating Conditions: Engine = Running

Parameter Normal Range: 0.4 to 4.5 V

5 V Reference 5 V 5 V 5 V

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4/9/2021 DTC P0191-P0193, P127C, or P127D - 6.6L L5P • 2017 Chevrolet Silverado - 4WD • MotoLogic

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Circuit/System Description

For an overview of the component/system, refer to: Fuel System Description

Conditions for Running the DTC

P0191

DTC P0116-P0119, P0128, P0192, P0193, P111E, P262B = Not set

ECT Sensor = Greater than −40°C (−40°F)

Circuit Short to Ground Open Short to Voltage

Signal 0 V 5 V 5 V

Low Reference — 0.96 V —

Fuel Rail Pressure Sensor 2

Circuit Short to Ground Open Short to Voltage

Operating Conditions: Engine = Running

Parameter Normal Range: 0.4 to 4.5 V

5 V Reference 5 V 5 V 5 V

Signal 0 V 5 V 5 V

Low Reference — 4.06 V —

Circuit Description

5 V Reference Regulated voltage supplied by the control module.

Signal The control module input circuit has an internal resistance connected to 5 V.

Low Reference Grounded through the control module.

Component Description

B47B Fuel Rail Pressure Sensor — Fuel Rail Pressure
Sensor 1

The sensor measures the pressure in the component: Fuel Rail — The
signal voltage increases when the pressure increases.

B47B Fuel Rail Pressure Sensor — Fuel Rail Pressure
Sensor 2

The sensor measures the pressure in the component: Fuel Rail — The
signal voltage decreases when the pressure increases.

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.

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