6C5-8591A-35-00 Yamaha ECU 50HP 60HP | Genuine Used Part

🔧 Product Description

Genuine Yamaha F50 / F60 ECU / Engine Control Unit - Part Number: 6C5-8591A-35-00

A genuine Yamaha engine control unit used on F50, F60 and T60 / FT60 four-stroke EFI applications. This ECU manages fuel injection, ignition timing, idle speed, sensor monitoring and engine-protection functions on compatible 50HP and 60HP Yamaha outboards.

⚙️ Key Features

• Genuine Yamaha ECU / engine control unit
• Correct Yamaha part number 6C5-8591A-35-00
• Sometimes listed as 6C5-8591A-35.-00; correct Yamaha formatting is 6C5-8591A-35-00
• Used on F50 / F60 / T60 / FT60 four-stroke EFI electrical-system applications
• Exact model code, market code, serial number and ECU label must be confirmed

🚤 Compatibility

Commonly used on

• Yamaha F50 / F60 / T60 / FT60 EFI four-stroke engine-management systems

Typically suits

• Engine models:
• Yamaha F50FEHT 2014 electrical-system applications
• Yamaha F50FET 2014 electrical-system applications
• Yamaha F60CEHT 2014 electrical-system applications
• Yamaha F60CET 2014 electrical-system applications
• Yamaha FT60DET 2014 electrical-system applications
• Yamaha F60L 2015-2016 electrical-system applications
• Yamaha F60LH 2015-2016 electrical-system applications
• Yamaha T60L 2015-2016 electrical-system applications
• Yamaha T60X 2015-2016 electrical-system applications
• Yamaha F60L 2021-2024 electrical-system applications
• Yamaha F60LH 2021-2022 electrical-system applications
• Yamaha T60L 2021-2024 electrical-system applications
• Yamaha T60X 2021-2024 electrical-system applications
• HP Range: 50HP - 60HP
• Engine Type: Yamaha EFI four-stroke outboard
• Year Range: 2014, 2015-2016, and 2021-2024 catalogue applications where 6C5-8591A-35 is specified
• Fitment Note: ECU calibration must be matched to the exact Yamaha model suffix and market code

🔌 Function

The ECU controls EFI fuel injection, ignition timing, idle speed, diagnostic output, warning functions and engine-protection response.

⚠️ Common Signs of Failure

• No-start with confirmed fuel supply, ignition input and ECU power
• No injector pulse or unstable injector command
• No diagnostic communication
• Intermittent stalling or limp mode
• Persistent ECU or sensor fault codes after wiring checks
• Rough running, rich condition or lean condition after mechanical checks
• ECU failure caused by voltage spike, corrosion or water ingress

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 6C5-8591A-35-00 current Yamaha ECU reference
• 6C5-8591A-30-00 earlier ECU reference superseded to 6C5-8591A-35-00
• 6C5-8591A-31-00 / 6C5-8591A-32-00 / 6C5-8591A-33-00 related F50 / F60 ECU calibration references

OEM / Related Numbers

• 6C5-8591A-35-00
• 6C58591A3500
• 6C5-8591A-35
• 6C5-8591A-30-00
• 6C5-8591A-31-00
• 6C5-8591A-32-00
• 6C5-8591A-33-00
• Related F50 ECU family reference: 6C1-8591A series
• Related rectifier / regulator reference: 68V-81960-10-00
• Related ignition coil damper reference: 6C5-82317-01-00

Aftermarket / Verified Equivalents

• No aftermarket equivalent

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated