Throttle Control System - Yamaha EF1000iS Service Manual

THROTTLE CONTROL SYSTEM

ENGINE DOES NOT START, ENGINE STARTS BUT STALLS, ENGINE SPEED
DOES NOT INCREASE, OR ENGINE SPEED IS UNEVEN.
Check AC output.
GOOD
Rotate the shaft of the throttle control motor to check
if it turns smoothly with slight resistance.
GOOD
Measure the coil resistance between 3-1, 3-2, 3-4,
and 3-5 of the throttle control motor.
(Tester range: Ω × 1)
Coil resistance:
250 Ω ± 20% at 20 °C (68 °F)
SPECIFICATION
Check the connections of the wire harness connectors
and couplers, and the wires for an open circuit or short
circuit.
GOOD
Replace the control motor.
THROTTLE CONTROL SYSTEM
NO GOOD
NO GOOD
OUT OF SPECIFICATION
NO GOOD
Refer to "GENERATOR SYSTEM" in
CHAPTER 5.
Replace the throttle control motor.
Replace the throttle control motor.
Correct or replace.
6-6
TRBL