4954677
Speed Sensor
Cummins®

Introduction

The Cummins 4954677 Speed Sensor is a vital component in commercial trucks, providing accurate wheel speed data to the vehicle’s electronic control unit (ECU) ³. This data is essential for the proper functioning of various vehicle systems, ensuring optimal performance and safety.

Basic Concepts of Speed Sensors

Speed sensors measure the rotational speed of components like wheels or shafts, converting mechanical action into an electrical signal ¹. They are crucial in automotive systems for monitoring and controlling functions. These sensors often operate on principles such as magnetic induction, where changes in the magnetic field generate an electrical signal proportional to the speed of rotation.

Purpose of the Cummins 4954677 Speed Sensor

This Cummins part measures wheel rotational speed and transmits this data to the vehicle’s ECU. The ECU uses this information to adjust systems such as the transmission, braking, and cruise control, ensuring efficient and safe truck operation ³.

Key Features

The 4954677 is designed with features that enhance performance and reliability. It is constructed from durable materials to withstand harsh commercial trucking conditions. The sensor ensures accurate and consistent data transmission, with specifications tailored for heavy-duty applications ².

Benefits of Using the Cummins 4954677 Speed Sensor

Utilizing this sensor offers advantages such as improved vehicle performance through precise data for real-time ECU adjustments. It enhances safety features by providing accurate speed information to systems like the anti-lock braking system (ABS). Additionally, it contributes to increased fuel efficiency by optimizing transmission operation ³.

Integration with Vehicle Systems

The 4954677 seamlessly integrates with various vehicle systems. It works with the ABS to prevent wheel lock-up, with the transmission control to optimize gear changes, and with the cruise control to maintain consistent speeds. This integration ensures peak efficiency and safety ³.

Common Issues and Troubleshooting

Speed sensors, including the 4954677, can face issues like signal interference, physical damage, or electrical faults. Diagnosing these problems involves checking the sensor’s output signal, inspecting for damage, and ensuring no electromagnetic interference. Troubleshooting steps may include cleaning the sensor, repairing wiring, or replacing the sensor if faulty ¹.

Maintenance Tips

Regular maintenance is recommended for the longevity and optimal performance of the 4954677. This includes inspecting for wear or damage, cleaning to remove dirt or debris, and ensuring secure and corrosion-free electrical connections ².

Cummins: A Brief Overview

Cummins Inc. is a global leader in designing, manufacturing, and distributing engines, filtration, and power generation products. With over a century of history, Cummins has a strong reputation in the commercial truck industry for reliable and high-performance components ³.

Cummins Speed Sensor 4954677 Compatibility

The 4954677 is designed for seamless integration with various Cummins engine models. It is crucial for maintaining optimal engine performance by providing accurate speed data to the ECU ³.

QSV91-G4 CM558/CM700 V102

The 4954677 is compatible with the QSV91-G4 CM558/CM700 V102 engines, known for their robust design in heavy-duty applications. The sensor connects to the transmission or differential, ensuring precise speed readings for the ECU ³.

QSV91G

The 4954677 is also compatible with the QSV91G engine, part of the Cummins QSV series recognized for reliability and performance. The sensor integrates into the QSV91G engine, connecting to the same points as in the CM558/CM700 V102 engines, ensuring accurate speed data for optimal engine operation ³.

Role of Part 4954677 Speed Sensor in Engine Systems

The 4954677 is integral in modern engine systems, working with the Engine Control Module (ECM) for optimal performance and efficiency ³.

Interaction with the Engine Control Module (ECM)

The Speed Sensor monitors the rotational speed of engine components, sending real-time data to the ECM. The ECM uses this information to adjust fuel injection, ignition timing, and other parameters, maintaining engine performance under varying conditions ³.

Enhancing Fuel Efficiency and Emissions Control

By providing accurate speed data, the 4954677 enables the ECM to fine-tune the air-fuel mixture, resulting in more efficient combustion and reduced emissions. This is crucial for meeting environmental regulations ³.

Supporting Transmission Operations

In vehicles with automatic transmissions, the Speed Sensor interacts with the Transmission Control Module (TCM), providing data for determining the appropriate gear, ensuring smooth and efficient gear changes ³.

Facilitating Diagnostic Functions

The 4954677 is vital for onboard diagnostics, helping the ECM identify engine performance irregularities like misfires or abnormal RPM fluctuations, allowing for timely interventions ³.

Contribution to Vehicle Stability and Safety

The Speed Sensor contributes to vehicle stability and safety systems by providing essential data for systems like Traction Control and Electronic Stability Control, enabling split-second adjustments for enhanced driver safety ³.

Conclusion

The Cummins 4954677 Speed Sensor plays a multifaceted role in modern engine systems, interacting with the ECM to optimize performance, efficiency, and safety. Its integration with various vehicle systems ensures that commercial trucks operate at peak efficiency and safety standards.