Yamaha YBR 125 workshop manual
Yamaha YBR 125 parts in the USA
Yamaha YBR 125 Throttle position / intake air temp and pressure sensors
all three of these functions are read by the same throttle body unit .
throttle body assembly 5 pin connector
connectors left to right as photoed
V T G M A
these are so easy to test with the FI diagnostics tester , bit more complicated without so here goes .
For more detailed explanation try the Haynes workshop manual as im doing this from memory
Intake air pressure sensorFault code 13 faulty wiring , damaged sensor , faulty ecu
This is a part of the above sensor , first check all wiring , turn on igniton and then test voltage at the
+ positive Pink / white wire , - negative black / blue wire . The voltage should be between 3.75 and 4.25 volts . if this is not correct change the sensor , if still not rectified try replacement ecu .
Intake air pressure sensorFault code 14 blockage or ecu failure
clean out the hole to the sensor to make sure air flows as it should or replace sensor , or replace ecu if this fails .
Intake Air temperature sensor
Check all wiring to the sensor is always a good start , clean out with contact cleaner
and retry .
Using K-ohms scale , + probe to brown/white wire , neg proge to the black / blue and test resistence
should be values of 2007-09 models 2.4 ~ 2.9 K-ohms
and 2010 on 5.7~6.4 K-ohms .
TPS throttle position sensor
Check all wiring fist and clean conectors , it does work , sometimes .
Set multimeter to volts , + positive probe to blue wire , voltage should be 5 volts .
to check the output voltage range , + positive to Yellow/blue wire , - negative to Black/blue wire
voltage closed should be 0.63~0.73 volts , and should increase in voltage as throttle is slowly opened to fully open position .
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