Yamaha PZ50W Service Manual page 299

Is self-diagnosis code 15, 16, or 42 displayed?
YES
NO
Has throttle body icing occurred or is foreign
material stuck in the throttle body?
YES
NO
Is the throttle switch malfunctioning?
YES
NO
Is the throttle cable free play out of specification?
YES
NO
Was the engine revved with the V-belt removed?
YES
NO
Is the throttle position sensor, speedometer unit, or
speed sensor installed incorrectly?
YES
NO
Correct the connection and/or replace the
speedometer unit and/or ECU.
2
1
7
8
9
T.O.R.S. OPERATES.
3
5
6
8-5
IGNITION SYSTEM
Check the affected item(s).
Perform throttle body maintenance.
Repair or replace the throttle switch.
Adjust the throttle cable free play.
Refer to "THROTTLE CABLE FREE PLAY
ADJUSTMENT" in CHAPTER 2.
When the engine is revved with the V-belt
removed, the speed sensor is diagnosed as mal-
functioning and T.O.R.S. operates.
Install correctly.
1 Crankshaft position sensor
2 Engine speed
3 ECU (engine control unit)
4 Ignition
4
5 Throttle position sensor
6 Throttle switch
7 Speed
8 Speed sensor
9 Speedometer unit
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ELEC