P0115; Troubleshooting - Yamaha MT-09 2021 Service Manual

EAS20424

P0115

EAS32843

TROUBLESHOOTING

Item
Coolant temperature sensor: signal stuck
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
TIP
• Perform this procedure when the engine is cold.
• If more than one DTC is detected at the same time, perform troubleshooting of DTC listed below first.
• P0116, P0117, P0118, P0335, P0500, P2122, P2123, P2127, P2128, P2138
1. Defective coolant temperature sensor.
• Measure and note the coolant temperature sensor resistance at ambient temperature.
• Start the engine and warm-up the vehicle.
• Measure the coolant temperature sensor resistance at engine warmed-up, then compare the noted
resistance at ambient temperature.
Is the resistance change?
YES
→ Go to step 2.
NO
a. Allow the engine to cool to ambient temperature, then replace the coolant temperature sensor.
b. Turn the main switch to "ON", then start the engine and warm-up the vehicle.
c. Check the condition of the DTC using the malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 3, and complete the service.
NO
→ Go to step 2.
2. Malfunction in ECU.
• Replace the ECU, and complete the service.
Refer to "REPLACING THE ECU (Engine Control Unit)" on page 8-56.
3. Delete the DTC and check that the MIL goes off.
• Confirm that the DTC has a condition of "Recovered" using the YDT, and then delete the DTC.
9-117
P0115