Yamaha Motorcycle FI Light On — What It Means

What Does This Error Mean?

Yamaha motorcycle FI warning light means the ECU has stored a fuel injection fault code. Yamaha uses a blink code system similar to Honda — count the flashes to identify the specific error code without a scan tool.

Affected Models

Yamaha YZF-R Series
Yamaha MT Series
Yamaha FZ Series
Yamaha Tenere
Yamaha XSR Series
Yamaha TMAX Scooter

Common Causes

Throttle position sensor fault (Code 12)
Sidestand switch fault (Code 19)
Intake air temperature sensor fault (Code 30)
Lean angle sensor fault (Code 46)
Injector fault
Crankshaft position sensor fault

How to Fix It

Read the Yamaha diagnostic blink codes.

Turn the ignition ON (engine off). The FI warning light will blink in a pattern. Count slow blinks (tens digit) and fast blinks (units digit). For example: 1 slow + 2 fast = Code 12 (TPS fault). Record the number.
Look up the blink code.

Common Yamaha FI codes: 12 (TPS), 13 (TPS), 19 (sidestand switch), 22 (intake air pressure sensor), 30 (IAT sensor), 33 (fuel injector), 41 (lean angle sensor), 46 (lean angle sensor). The specific code tells you exactly which sensor or component to inspect.
Inspect the sensor or component indicated.

Check the connector for the specified sensor — corrosion, moisture, and loose connectors are responsible for a large proportion of Yamaha FI codes. Clean with contact cleaner, dry, and reconnect firmly.
Clear the code and test ride.

Disconnect the battery for 30 seconds to clear stored codes, then reconnect. Ride for 15–20 minutes and confirm the FI light does not return.

When to Call a Professional

If the FI light is on and the bike is running rough, losing power, or stalling, read the blink code before riding further. If the indicated fault is in the fuel injector or ECU, a Yamaha dealer can diagnose and replace the part with proper equipment.