Yamaha YZ250(W)/W1 Owner's Service Manual page 532

TPS (THROTTLE POSITION SENSOR) SYSTEM
1
2
EC69A000
HANDLING NOTE
cC
Do not loosen the screws {TPS (throttle
position sensor)} except when changing
the TPS (throttle position sensor) due to
failure because it will cause a drop in
engine performance.
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
9 Couplers and leads connection
EC692000
TPS COIL INSPECTION
1. Remove:
9 Carburetor
9 Mixing chamber top
2. Inspect:
1
9 TPS coil resistance
L Y
B
2
Tester (+) lead ¡Blue lead 1
Tester (–) lead ¡Black lead 2
6-10
Rust/ Dust/ Looseness/Short-circuit ¡
Repair or replace.
Refer to "CARBURETOR AND REED
VALVE" section in the CHAPTER 4.
Out of specification ¡ Replace.
TPS coil
resistance
4~6kΩ at
20°C (68°F)
ELEC
Tester selector
position
kΩ × 1