Yamaha YZF-R125 Service Manual: Troubleshooting method
The engine operation is not normal and the engine trouble warning light comes on.
1. Check:
- Fault code number
a. Check the fault code number displayed on the FI diagnostic tool.
b. Identify the faulty system with the fault code.
Refer to "Self-Diagnostic Function table".
c. Identify the probable cause of the malfunction.
Refer to "Diagnostic code table".
2. Check and repair the probable cause of the
malfunction.
3. Perform fuel injection system reinstatement action.
Refer to "Reinstatement method" of table in "TROUBLESHOOTING DETAILS" on page 8-41.
4. Set the main switch to "OFF" and back to "ON", and then check that no fault code number is displayed.
NOTE:
If other fault codes are displayed, repeat steps (1) to (4) until no fault code number is displayed.
5. Erase the malfunction history in the diagnostic mode. Refer to "Sensor operation table (Diagnostic code No. 62)".
NOTE:
Setting the main switch to "OFF" will not erase the malfunction history.
The engine operation is not normal but the engine trouble warning light does not come on.
1. Check the operation of the following sensors
and actuators in the diagnostic mode. Refer
to "Sensor operation table" and "Actuator operation
table".
If a malfunction is detected in the sensors or actuators, repair or replace all faulty parts.
If no malfunction is detected in the sensors and actuators, check and repair the inner parts of the engine.
Self-diagnostic function table
If the ECU detects an abnormal signal from a sensor while the vehicle is
being driven, the ECU illuminates
the engine trouble warning light and provides the engine with alternate
operating instru ...
Diagnostic mode
It is possible to monitor the sensor output data or check the activation of
actuators with the FI diagnostic
tool connected to the vehicle and set to the normal mode or the diagnostic
monitoring ...
Other materials:
Troubleshooting
Any of the following fail to light: headlight, high beam indicator light,
taillight, license plate light, auxiliary
light or meter light.
NOTE:
Before troubleshooting, remove the following part(s):
1. Seats
2. Fuel tank
...
Cleaning the air filter element
NOTE:
There is a check hose "1" at the bottom of the air
filter case. If dust and/or water collects in this
hose, clean the air filter element and air filter
case.
1. Remove:
Rider seat
Refer to "GENERAL CHASSIS" on page 4-1.
2. Remove:
Fuel tank
Refer to "FUEL TANK" on page ...
Checking the throttle body joint and air filter case joint
1. Remove:
Right lower side cowling
Left lower side cowling
Refer to "GENERAL CHASSIS" on page 4-1.
2. Check:
Throttle body joint "1"
Air filter case joint "2"
Cracks/damage Replace.
3. Install:
Right lower side cowling
Left lower side cowling
Refer to "GENERAL CHAS ...