Background
Background: A 2020 YAMAHA ZY125T-15 motor, its instrument warning light is on and engine speed is a little bit high after washing throttle. DTC ID shows P0507 with description of 【[For FID/ISC valve]FID/ISC valve(stuck fully open)[For ETV]ldling failure】.
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F1/CgAGe2DrzCSALOVjAAFnR7ZOSmg315.png)
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F1/CgAGe2DrzCaAKV4MAAGX6Uu0s70294.png)
Maintenance Tips
Maintenance Tips:
It needs to learn about idle speed control after any maintenance below.
●Uninstall and install throttle
●clear throttle
●change throttle
●uninstall and install Idle speed controller
Solutions
Solutions: Using MS80 to operate on follow test:
【(54)ISC(idle speed control)valve/FID(fast idle solenoid)】
【(67)ISC correction value erasure】
【(87)Air-fuel control learning data erasure】
Detail Steps:
①Connect MS80 to Motorcycle, enter into【Moto Diag】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F2/CgAGe2DrzIuARncVAAxUD7BpJTU283.png)
②Click【All】, input letters such“YAM”in search bar, click【YAMAHA】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F2/CgAGe2DrzNiAUO50AAHgxKny25I530.png)
③Click the newest YAMAHA edition;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F3/CgAGe2DrzQKAAS0IAADKrEpkrHE797.png)
④Click【Select from system】,【Auto Scan】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0RCAM-xhAAC7ZaDcOsc095.png)
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0RGAPRhnAAC0poK-dEs803.png)
⑤Turn off the ignition, click【Enter】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0TiAKnXAAACA3Hyhr8Y443.png)
⑥Turn on the ignition, click【Enter】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0VSAQZuZAAB_jzVGpZA980.png)
⑦Turn off the ignition, click【Enter】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0TiAKnXAAACA3Hyhr8Y443.png)
⑧Turn on the ignition, click【Enter】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0VSAQZuZAAB_jzVGpZA980.png)
⑨Turn off the ignition, click【Enter】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0Z2Ac8m2AAB_yBtZwYY424.png)
⑩Turn on the ignition, click【Enter】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0bmAZxx5AAB-iHrhwP0246.png)
⑪Click【Engine Control Unit】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0dmAWE_LAADFTdKAtc4560.png)
⑫Click【Special Function】, 【ldle speed learning】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0fGAe2LtAAD0FvQdMk4599.png)
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F7/CgAGe2Dr0gKAeRsQAADIGTw2VaI401.png)
⑬Click【(54)ISC(idle speed control)valve/FID(fast idle solenoid)】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0iOACZIWAAELCzySvPc327.png)
⑭Click【Actuator Check】three times in 5 seconds;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0jCACRJIAAKXzcUW1Qk996.png)
⑮Operation successful, it shows 0;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0keABww_AAKYpC-uX3w688.png)
⑯Click【(67)ISC correction value erasure】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0m2AZn0dAAEJW3cuBUQ487.png)
⑰Click【Actuator Check】three times in 5 seconds, then ISC correction value will be erased;
Notes:
00:the ISC correction value has been erased;
01:no need to erase the ISC correction value;
02:erase the ISC correction value.
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0ouAPYqkAAHBObvY890872.png)
⑱After ISC correction value erasure, it shows 0;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0qKAQwSQAAHC-bSufDg620.png)
⑲Click【(87)Air-fuel control learning data erasure】;
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0ryACG_iAAELsCltM68385.png)
⑳Click【Actuator Check】three times in 5 seconds to erase the air-fuel control learning data.
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0tGAAhMfAAGLT55FAhw127.png)
㉑After air-fuel control learning data erasure, it shows 0.
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/F8/CgAGe2Dr0uqALRG5AAGNGh12C6M339.png)
㉒Engine speed shows normal value. It has no fault after clearing all faults. With its instrument warning light off, the problem got resolved.
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/FA/CgAGe2Dr1viAU4LWAAGWsHY-MTY831.png)
![【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL 【SPECIAL FUNCTION】2020 YAMAHA ZY125T IDLE SPEED CONTROL](https://0.rc.xiniu.com/g2/M00/5A/FA/CgAGe2Dr1wqAWA7PAAVBlbbbtz8546.jpg)
Summary
If Motorcycle has idle speed instability or a little bit high after uninstalling and installing, clearing, changing throttle, operate on erasure of ISC correction value and air-fuel control learning to solve the problems.