Yamaha FI Code 17: EXUP Servo Motor Circuit — Fix
On Yamaha motorcycles and scooters, FI fault code 17 means an open or short circuit in the EXUP servo-motor circuit. EXUP is Yamaha’s exhaust valve (fitted to sport models such as the R1, R6, MT-09) that boosts mid-range power.
- Applies to
- Yamaha motorcycles
- Est. repair cost
- $30 – $250
- Time to fix
- 30–90 minutes
What it means
Check the EXUP servo connector and wiring, the servo motor, and the valve cables. This is a generic Yamaha fuel-injection (FI) fault code, so it applies across Yamaha FI models — scooters and underbones like the Mio, NMAX, Aerox, and Sniper, plus YZF-R and MT motorcycles. Yamaha shows the code as a number on the diagnostic/odometer display, and the engine-warning light comes on. Once the fault is repaired and the ECU no longer detects it, the code clears; cycling the ignition (or using a Yamaha diagnostic tool) may be needed to confirm.
Symptoms
- FI code 17 with warning light on
- Flat spot or reduced mid-range power
- On models with an EXUP exhaust valve
How to fix it
- 1
Inspect the servo connector and wiring
1. Locate the EXUP servo motor (near the exhaust/under the seat). 2. Reseat the connector and check the wiring.
- 2
Check the servo and cables
1. Confirm the servo and its cables move the exhaust valve freely. 2. Replace a failed servo, then clear the code.
Frequently asked questions
What is EXUP?
EXUP (Exhaust Ultimate Power valve) is a butterfly in the exhaust that Yamaha opens and closes to broaden the power band on sport models. Code 17 is an electrical fault in its servo circuit.
Last updated July 16, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.