Standard Ignition S3109 Engine Coolant Temperature Sending Unit Switch Connector

Engine Coolant Temperature Connector for Toyota and Lexus

Standard Ignition S3109 is an engine coolant temperature sending unit switch connector built for direct replacement on a wide range of Toyota and Lexus applications. It features a weatherproof sealed oval housing, a male connector with a female blade terminal, and 18-gauge single-wire construction for a secure electrical connection.

Key Features

• Standard Ignition S3109 engine coolant temperature sending unit switch connector
• Oval connector shape with male connector and female blade terminal
• 18-gauge wire with 43 cm harness length for service replacement
• Weatherproof sealed design
• Single-wire, single-terminal configuration
• Compatible With Toyota Tacoma, 4Runner, Tundra, Camry, Corolla, and Lexus GX470 applications

Detailed Description

This Standard Ignition S3109 connector is used at the engine coolant temperature sending unit switch connection point, where a stable electrical signal is needed for accurate temperature reporting. The 1-inch housing length and 430 mm harness length support a clean replacement on vehicles such as the Toyota Tacoma, Toyota 4Runner, Toyota Camry, and Lexus GX470. This part cross-references OE-style numbers such as 9098011428 and EC3137 for the same application.

Built with a weatherproof sealed connector body, the S3109 helps maintain a dependable connection in engine-bay conditions. It is a direct-fit electrical connector for many Toyota and Lexus models from 1993 through 2006, including Toyota Land Cruiser, Sequoia, Tundra, Avalon, Sienna, Solara, Supra, and Lexus ES300, LS400, SC400, and LX470.

What It Helps Fix

• Broken or heat-damaged coolant temperature sensor connector
• Intermittent temperature signal at the sending unit switch
• Corroded or loose blade-terminal connection
• Cracked connector housing or damaged wire lead
• Electrical faults at the engine coolant temperature circuit

Installation Notes and Tips

Verify connector shape, terminal style, and wire configuration against the original part before installation. This connector uses a single 18-gauge wire and a female blade terminal, so matching the OE layout is important for proper fitment. Confirm vehicle application by year, make, and model before service on Toyota Tacoma, Toyota 4Runner, Toyota Tundra, Toyota Camry, and related Lexus applications.

Quality Assurance

Standard Ignition replacement electrical connectors are built to meet service-replacement requirements for common import applications. S3109 is a practical choice for restoring a secure coolant temperature sensor connection on Toyota and Lexus vehicles.