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Yamaha:

Fault code No. 50. ECU memory malfunction (Yamaha YZF-R1 Y(C))

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Fault code No.	50
Symptom	ECU memory malfunction
Fail-safe action	Engine startup: Under certain conditions
Fail-safe action	Riding: Under certain conditions
Diagnostic monitoring code No.
Meter display
Checking method

	Item/components and probable cause	Check or maintenance job	Sensor inspection procedure
1	ECU malfunction	Replace the ECU.	Place the main switch to the ON position. Then, check that no fault code indicated.

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Yamaha YZF-R1Y(C) 7: Fuel injection

Fault code No. 46. Incorrect voltage is supplied to the ECU
Fault code No. 44. An error is detected while reading or writing on EEP-ROM
Fault code No. 43. Incorrect voltage supplied to the fuel injector and fuel pump
Fault code No. 42. Normal signals are not received from the speed sensor
Fault code No. 41. Open or short circuit of lean angle sensor lead
Fault code No. 40. Open or short circuit of secondary injector lead
Fault code No. 39. Open or short circuit of primary injector lead
Fault code No. 36. Ignition coil #4 primary lead malfunction
Fault code No. 35. Ignition coil #3 primary lead malfunction
Fault code No. 34. Ignition coil #2 primary lead malfunction

Fault code No. 59. Open or short circuit of accelerator position sensor lead
Fault code No. 60. Defect Found in YCC-T Drive Type
Fault code No. 66. Open or short circuit of steering damper solenoid lead
Fault code No. 70. Engine has been left idling (The ECU automatically stops the engine after 20 minutes if it is left idling)
Fault code No. Er-1. No signal is received from the ECU
Fault code No. Er-2. No signal is sent from ECU
Fault code No. Er-3. Correct data cannot be received from the ECU
Fault code No. Er-4. No registration data can be received from the meter unit
Fuel pump system — circuit diagram
Fuel pump system — troubleshooting

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