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Troubleshooting the power unit
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Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, or limited
engine speed.
Symptom 2
Cause
Checking step
See
page
Spark plug does not
spark (some cylinders)
Spark plug malfunction
Check the ignition spark.
Check the spark plug.
Short, open, or loose connec-
tion in ignition coil circuit
Measure the ignition coil input voltage.
Check for wiring continuity between the
ignition coil and engine ECM.
Check for wiring continuity between the
ignition coil and main relay.
Ignition coil malfunction
Exchange the ignition coil with a different
one, and then check the ignition spark.
—
Engine ECM malfunction
Replace the engine ECM.
Fuel pressure is low
—
Measure fuel pressure.
Fuel leakage
Check the fuel leakage.
Pressure regulator malfunction Check the pressure regulator.
Clogged fuel filter
Check the fuel filter for dirt and obstruc-
tions.
High-pressure fuel pump mal-
function
Measure the high-pressure fuel pump
resistance.
Fuel not supplied (some
cylinders)
Fuel injector malfunction
Check the fuel injector operation using
the YDIS.
Measure the fuel injector resistance.
Short, open, or loose connec-
tion in fuel injector circuit
Measure the fuel injector input voltage.
Check for wiring continuity between the
fuel injector and main relay.
Check for wiring continuity between the
fuel injector and engine ECM.
Clogged fuel injector filter
Replace the fuel injector.
Engine ECM malfunction
Replace the engine ECM.
Compression pressure
is low
—
Measure the compression pressure.
Improper valve timing
Check the valve timing.
Check the timing belt.
Compression leakage
Check the valve for bends and sticking.
Check the piston and piston rings for
damage.
Check the cylinder for scratches.
Содержание F225F
Страница 1: ...SERVICE MANUAL 6CE 28197 3N 11 F L 225F F L 250D F L 300B ...
Страница 4: ......
Страница 54: ...1 31 SPEC Specification MEMO ...
Страница 89: ...2 34 Lower unit 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Страница 116: ...3 25 RIG GING Rigging information SET MENU CANCEL a b b c c c D q e E p v w o v C m h A B D D A B D D D F B ...
Страница 218: ...5 55 ELEC Electrical system 2 Connect the Y COP coupler a Y COP input voltage Red R Ground 12 0 V battery voltage R B a ...
Страница 254: ...6 19 FUEL Fuel system 3 Install the blowby hose f 4 Connect the air temperature sensor coupler a f a ...
Страница 263: ...6 28 Canister 0 1 2 3 4 5 6 7 8 9 10 A j k f b ...
Страница 267: ...6 32 Low pressure fuel pump 0 1 2 3 4 5 6 7 8 9 10 A 11 Fasten the vapor gas hoses p and q using the holder r q r p ...
Страница 296: ...7 13 Power unit POWR 21 Install the tube retainer H and then fasten it using the plastic tie I I H H ...
Страница 319: ...7 36 Shift actuator 0 1 2 3 4 5 6 7 8 9 10 A Shift actuator bolts d 19 N m 1 9 kgf m 14 0 ft lb c b d d a ...
Страница 477: ...8 98 Shimming counter rotation model 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Страница 493: ...9 14 Upper case and mount 0 1 2 3 4 5 6 7 8 9 10 A Lower mount bracket bolt o 55 N m 5 5 kgf m 40 6 ft lb t u v t v u o ...
Страница 537: ...9 58 PTT cylinder 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Страница 562: ...A 1 MEMO ...
Страница 565: ......
Страница 566: ...May 2010 1 ABE E_1 YAMAHA MOTOR CO LTD ...
Страница 576: ...A 13 ...