4-Pin 6098-4978 Sumitomo Waterproof Connector – Japanese OEM Automotive Harness

Direct-fit replacement for Sumitomo OEM part number 6098-4978, a 4-pin waterproof connector from the Sumitomo connector series used across Toyota, Honda, Nissan, and other Japanese OEM vehicle harnesses. Sumitomo Electric is the primary connector supplier for Toyota and Honda – the 6098-4978 is a high-quality OEM-grade replacement for sensor and actuator harness applications.

Key Specifications

• OEM Part Number: 6098-4978
• Pin Count: 4
• Waterproof Rating: IP68
• Wire Gauge: 18 AWG (0.5 mm²)
• Wire Length: 5.5 inches (140 mm)
• Housing Material: PA66 glass-filled nylon
• Terminal Material: Copper alloy, tin-plated
• Current Rating: Up to 13A per pin
• Operating Temperature: -40°C to +125°C

Applications

• Toyota engine sensor harness – camshaft, crankshaft, and throttle position sensors
• Honda fuel injector and O2 sensor harness connectors
• Nissan transmission sensor wiring
• Mazda and Subaru shared Sumitomo harness applications
• General-purpose 4-pin waterproof sensor harness repair

Sumitomo 6098 Series – Technical Notes

The Sumitomo 6098 series is a widely deployed waterproof connector family in Japanese OEM harnesses. Key characteristics:

• OEM-grade quality: Sumitomo connectors are manufactured to the same specifications as the original harness components
• Not compatible with Yazaki: Despite similar appearances, Sumitomo and Yazaki terminals use different crimp geometries and are not interchangeable
• Terminal retention: The 6098 series uses a dual-lock terminal retention system – ensure both the primary terminal lock and secondary TPA (Terminal Position Assurance) are fully engaged after installation

Frequently Asked Questions

Q: Is 6098-4978 a Sumitomo or Yazaki connector?
A: 6098-4978 is a Sumitomo part number. The 6098-XXXX series is Sumitomo's standard waterproof connector family. Do not confuse with Yazaki 6188/6189 series – they are not interchangeable.

Q: What vehicles use the 6098-4978 connector?
A: The 6098-4978 is used across multiple Toyota and Honda platforms. Cross-reference your vehicle's OEM service manual to confirm fitment by part number.

Q: What crimping tool is needed for Sumitomo terminals?
A: Use a ratchet crimper for 0.5mm² (18 AWG) Sumitomo terminals – the Hozan P-706 or Engineer PA-09 are commonly used. Sumitomo terminals require a specific crimp height – use a ratchet crimper to ensure consistent results.

Package Contents

1 × 4-Pin Connector (6098-4978) with 18 AWG wire and terminal insert