Fail-Safe System; Troubleshooting - Yamaha XSR 900 2022 Service Manual

Storing DTC
Once an abnormality has been detected, a pending DTC is stored in the memory of the ECU. Then, if
the abnormality is detected in the next two driving cycles, the MIL comes on and the DTC and FFD are
stored. If the vehicle is judged to be operating normally for three consecutive driving cycles, the MIL
goes off. However, the DTC, pending DTC, and FFD will not be deleted even if a battery terminal is dis-
connected.
Reproduction test
Operate the vehicle according to the engine speed, vehicle speed, and gear position in the FFD. Con-
firm the operating time in the conversion table of steady driving time according to the engine speed in
the FFD. Do not accelerate or decelerate excessively during the reproduction test. Continue to operate
the vehicle even if the vehicle cannot be operated at a constant speed due to the operating environ-
ment.
EWA20860
WARNING
When test riding the vehicle, always comply with local traffic regulations.
EAS33154

FAIL-SAFE SYSTEM

• Able/Unable to start engine (depending on the situation)
• Able/Unable to drive vehicle (depending on the situation)
EAS32820

TROUBLESHOOTING

TIP
• If more than one DTC is detected at the same time, perform troubleshooting of DTCs listed below first
DTC except P0300, P0301, P0302, P0303
• If more than one misfire DTC has been detected at the same time, open each FFD and check the total
ECU energization time at the time of failure or event, and refer to the latest FFD.
• How to identify the most recent FFD.
Total energization time of 00:25:30 is newer than 00:10:55 of FFD.
1. Connect the YDT and check the DTC stored in the ECU.
DTC is displayed
→ Check the engine speed, vehicle speed and gear position of FFD.
Delete DTC, then go to step 2.
Pending DTC is displayed
→ Confirm the engine speed, vehicle speed and gear position to the customer when the customer
feels an abnormality.
Delete pending DTC, then go to step 2.
DTC and pending DTC are not displayed.
→ Confirm the engine speed, vehicle speed and gear position to the customer when the customer
feels an abnormality
Go to step 2.
2. Perform the reproduction test under the following conditions, then go to step 3.
ECA26950
NOTICE
If the MIL flashes during the reproduction test, immediately decelerate or reduce the engine
speed. Otherwise, the catalyst could be damaged.
P0300, P0301, P0302, P0303
9-150