Yamaha YZ250N Owner's Service Manual page 512

TPS (THROTTLE POSITION SENSOR) SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
9Couplers and leads connection
Rust/ Dust/ Looseness/Short-circuit
Repair or replace.
EC692000
TPS COIL INSPECTION
1. Remove:
9Carburetor
9Mixing chamber top
Refer to "CARBURETOR AND REED
VALVE" section in the CHAPTER 4.
2. Inspect:
9TPS coil resistance
Out of specification
Tester (+) lead Blue lead 1
Tester (–) lead Black lead 2
TPS coil
resistance
4~6kΩ at
20°C (68°F)
3. Inspect:
9TPS coil variable resistance
Check that the resistance in increased as
the lever 1 is moved from the full close
position to the full open position.
Out of specification
Tester (+) lead Yellow lead 2
Tester (–) lead Black lead 3
TPS coil variable
resistance
Full closed
Zero~2kΩ at
20°C (68°F)
6-9
ELEC
Replace.
Tester selector
position
kΩ × 1
Replace.
Tester selector
position
Full opened
kΩ × 1
4~6kΩ at
20°C (68°F)