Standard Ignition SC634 Automatic Transmission Input Shaft Speed Sensor

Automatic Transmission Input Shaft Speed Sensor

Standard Ignition SC634 is an automatic transmission input shaft speed sensor built for OE-style fit and signal accuracy. It uses OE-match connectors and terminals to help ensure proper electrical connection, consistent readings, and reliable transmission input speed data for Ford, Lincoln, and Mercury applications.

Fits 2009-2022 Ford EcoSport, Fusion, Transit Connect, Escape, Taurus, Edge, Explorer; 2009-2017 Mercury Mariner; and 2013-2020 Lincoln MKZ, MKC, MKT.

Key Features

• OE-match connectors and terminals for proper fit
• OE-match output signal for accurate transmission speed readings
• Female rectangular plug-in connector with 3 male pin terminals
• Bolt-mount design for installation on the transmission
• 100% environmental, endurance, and end-of-line testing for signal amplitude and polarity
• Precision-manufactured components to support consistent engine and transmission performance

Detailed Description

The Standard Ignition SC634 automatic transmission input shaft speed sensor is engineered to deliver the signal quality needed for precise transmission control. By matching OE connector and terminal design, this sensor helps maintain a secure electrical connection and accurate communication with the vehicle control system. It is a direct-fit style replacement for many Ford Fusion, Ford Escape, Ford Edge, Ford Explorer, Lincoln MKZ, and related applications.

This part cross-references Standard Motor Products (e.g., VSS1168, SN8336) for the same application. The SC634 is a practical choice when replacing a worn or failed input speed sensor on vehicles that rely on accurate shaft speed data for shifting and drivability.

What It Helps Address

• Harsh, delayed, or inconsistent shifting
• Transmission speed signal faults
• Illuminated check engine or transmission warning lights
• Erratic transmission input speed readings
• Driveability issues related to incorrect transmission control data

Installation Notes and Tips

Mounts on the transmission with a bolt-mount design and a single rectangular plug-in connector. Verify connector shape, terminal count, and vehicle application before installation. For best results, inspect the harness and connector terminals for corrosion, damage, or looseness before replacing the sensor.

Quality Assurance

Standard Ignition subjects this sensor to environmental, endurance, and end-of-line testing to verify signal amplitude and polarity. That testing helps support consistent performance across the listed Ford, Lincoln, and Mercury applications. Part number SC634 is built to OE-match specifications for fit and signal output.