Yamaha MBK MW125 2014 Service Manual

FUEL INJECTION SYSTEM8-503 Air leak in intake air passages. Check the intake air passagesfor air leaks.Start the engine and let it idlefor approximately 10 seconds.Fault code number is not dis-played → Service is finished.Fault code number is displayed→ Go to item 4.4 Throttle valve is not fully closed. Check the throttle body.Check the throttle cable.Refer to “CHECKING THETHROTTLE GRIP OPERA-TION” on page 3-24.Start the engine and let it idlefor approximately 10 seconds.Fault code number is not dis-played → Service is finished.Fault code number is displayed→ Go to item 5.5 Installed condition of ISC valve. Check for looseness or pinch-ing.Improperly installed ISC valve→ Reinstall or replace the ISCvalve.Refer to “CLEANING THE ISC(IDLE SPEED CONTROL)UNIT AND THROTTLE BODY”on page 7-9.Start the engine and let it idlefor approximately 10 seconds.Fault code number is not dis-played → Service is finished.Fault code number is displayed→ Go to item 6.6 Installed condition of throttlebody sensor assembly.Check for looseness or pinch-ing.Start the engine and let it idlefor approximately 10 seconds.Fault code number is not dis-played → Service is finished.Fault code number is displayed→ Go to item 7.7 Defective throttle body sensorassembly.Execute the diagnostic mode.(Code No. D03)When engine is stopped: Atmo-spheric pressure at the currentaltitude and weather conditionsis indicated.At sea level: Approx. 101 kPa1000 m above sea level: Ap-prox. 90 kPa2000 m above sea level: Ap-prox. 80 kPa3000 m above sea level: Ap-prox. 70 kPaWhen engine is cranking: Makesure that the indication valuechanges.The value does not changewhen engine is cranking → Re-place the throttle body.Execute the diagnostic mode.(Code No. D01).When throttle is fully closed: Avalue of 14–20 is indicated.When throttle is fully open: Avalue of 92–102 is indicated.If the indication is outside ofrange → Replace the throttlebody.Start the engine and let it idlefor approximately 10 seconds.Fault code number is not dis-played → Service is finished.Fault code number is displayed→ Go to item 8.Fault code No. 79ItemEngine speed is high when the Engine is idling.Deceleration is poor when the vehicle is ridden.Bad condition of engine or sensor.