Yamaha FX SVHO Code 63: Intake System Reports Irregular Intake Air

Code 63 means on the FX SVHO that the control unit sees irregular intake air. On a supercharged engine that is a case for hose and gasket. M-JET DIAGNOSTIC helps with classification.

How to proceed

• Read the fault memory, note code 63 and accompanying codes (23, 29)
• Compare intake pressure and atmospheric pressure at standstill
• Watch intake pressure at idle and under load
• Visual check: hoses, clamps, gaskets on the intake path

Typical causes

A slipped clamp, a porous hose or a leaking joint in the intake path creates false air and implausible pressure values. With supercharging this has a particular effect because the pressure is used for mixture and ignition. If you find nothing visible, the pressure sensor itself is to be checked. Only clear the memory after the repair and check on a test ride that the message stays away.

Related topics

• Yamaha FX SVHO Won't Start or Dies Immediately
• Yamaha FX SVHO: Not Enough Power, Check Boost Pressure
• Yamaha WaveRunner Intake Air and Intake Pressure Sensor Fault
• Diagnostics and fault codes for your Yamaha model
• All Yamaha WaveRunner diagnostics topics

Everything runs via app over Bluetooth, for Yamaha WaveRunners from model year 2002 to today. Learn more about the M-JET DIAGNOSTIC for Yamaha WaveRunner.