Yamaha Fault Code

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Code 46

Engine Stalls / Battery Light

Variant 1

System

Electrical

Symptom

Engine Stalls / Battery Light

Diagnosis & fix steps

LOGIC: Power Supply Error (Abnormal Voltage). ACTION: Check the Rectifier/Regulator (RR) output and battery terminals for tightness.

Red Seal field insights

Specs: Charging should be 14.0V - 14.5V at 5k RPM. PRO-TIP: Often caused by "aftermarket accessories" overloading the stator.

Variant 2

System

Electrical

Symptom

No Start / Low Idle

Diagnosis & fix steps

LOGIC: FI Power Supply Abnormal. ACTION: Load test battery; check Rectifier (R/R) plug for burnt pins.

Red Seal field insights

PH Pop: Huge for NMAX/Mio. FIX: Usually a failing charging system.

Variant 3

System

Electrical

Symptom

No Start / Battery Drain

Diagnosis & fix steps

LOGIC: Power Supply to the FI System is abnormal. ACTION: Inspect the stator output and the regulator/rectifier plug for melted terminals.

Red Seal field insights

Logic: Popular in the Philippines; the regulator cannot maintain 14V. FIX: Replace the regulator and verify stator AC output is 14-20V at idle.

Variant 4

System

Electrical

Symptom

Engine Quits / No Start

Diagnosis & fix steps

LOGIC: Abnormal power supply to the FI system. ACTION: Inspect the rectifier/regulator and stator output.

Red Seal field insights

PRO-TIP: Check the 3-pin stator connector for melting; it’s a high-heat failure point.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

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Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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