Troubleshooting Details (Fault Code) - Yamaha YZ 2020 Series Owner's Service Manual

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1. ECU (Engine Control Unit)
2. Lead battery (12 V)
3. Vehicle battery
4. Vehicle
5. Coupler for connecting optional part
6. FI diagnostic tool sub-lead
EAM30286

TROUBLESHOOTING DETAILS (FAULT CODE)

This section describes the measures per fault code number displayed on the Yamaha diagnostic tool.
Check and service the items or components that are the probable cause of the malfunction following
the order given.
After the check and service of the malfunctioning part have been completed, delete the fault codes dis-
played on the Yamaha diagnostic tool according to the reinstatement method.
Fault code No.:
Fault code number displayed on the Yamaha diagnostic tool when the engine failed to work normally.
Diagnostic code No.:
Diagnostic code number to be used when the diagnostic mode is operated. Refer to "DIAGNOSTIC
CODE: SENSOR OPERATION TABLE" on page 9-12.
Parts connected to the ECU
The following parts are connected to the ECU.
When checking for a power short circuit, the couplers must be disconnected from all of the following
parts beforehand.
• Crankshaft position sensor
• Fuel injector
• Ignition coil
• Throttle position sensor
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5 5
• Intake air pressure sensor
• Coolant temperature sensor
• Intake air temperature sensor
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FUEL INJECTION SYSTEM
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7. Sub-harness (included with the Yamaha diag-
nostic tool)
8. Vehicle communication cable (included with
the Yamaha diagnostic tool)
9. Yamaha diagnostic tool