Yamaha F200B Service Manual page 124

TRBL
SHTG
Symptom 1: High engine idle speed.
Symptom 2
—
Symptom 1: Engine stalls, unstable engine idle speed, or poor acceleration.
Symptom 2
Improper intake cam
timing
Symptom 1: Limited engine speed (approximately 2000 r/min).
Symptom 2
Buzzer comes on,
Overheat alert
indicator comes on
Buzzer comes on,
oil pressure alert
indicator comes on
4-23
Troubleshooting
Cause
Air leakage (throttle valve–
cylinder head)
Throttle cable is not adjusted
properly
Cause
Stuck OCV spool valve
Clogged OCV filter
Clogged oil passage
Stuck VCT
Cause
Clogged cooling water inlet
Water pump malfunction
Clogged cooling water
passage
Thermostat malfunction
Insufficient engine oil
—
Engine oil pressure decrease
Checking step
Check the gaskets of the intake
manifolds, surge tank, and throttle
body.
Adjust the throttle cable.
Checking step
Check the OCV operation using the
YDIS.
Check the OCV spool valve.
Replace the OCV filter.
Check the oil passage.
Replace the VCT assembly.
Checking step
Check the cooling water inlet.
Check the impeller.
Check the Woodruff key.
Check the water pump housing.
Check the insert cartridge.
Check the outer plate cartridge.
Check the cooling water passage.
Check the thermostat.
Check the engine oil level.
Check the engine oil leakage.
Check the valve seals and valves.
Check the piston rings.
Measure the oil pressure.
Check the oil pump.
Check the oil strainer.
Check the oil passage (power unit and
oil pump).
Replace the oil filter.
See
page
6-15
6-26
3-8
See
page
5-37
5-37
10-12
2-16
7-46
See
page
10-8
8-9
8-9
8-9
8-9
8-9
2-17
7-85
10-5
2-16
7-58
7-86
7-1
7-77
9-24
2-16
10-10