Yamaha F115 AETL [678/709] Trbl anls

Yamaha FL115A [678/709] Trbl anls
9-9
E
TRBL
ANLS
TROUBLE SHOOTING FOR ELECTRIC FUEL
INJECTION
3. Erratic engine
speed
1. The engine is started, but will not run smoothly. The engine speed
drops during acceleration.
1. Check the high-pressure fuel lines.
2. Check the ignition system.
3. Check the ignition timing.
Items Symptoms
1) Check for fuel line
leaks
2) Check the fuel
pressure
3) Check the operation
of the fuel injector
4) Check the diagnosis
cord
Fuel pressure is
out of specification
1 Check the 20-A fuse
2 Check the main relay
3 Check the high-pres-
sure fuel pump opera-
tion
4 Check the main relay
drive’s ECM output
5 Check the pressure
regulator
1) Check the wire harness
2) Check the ignition spark
3) Check the ignition coil
4) Check the ECM output peak
voltage
5) Check the pulser coil output
peak voltage
1) Check the diagnosis
cords
1 Check the pulser coil
diagnosis cord
2 Check the engine cooling
water temperature sen-
sor diagnosis cord
3 Check the intake air tem-
perature sensor diagno-
sis cord

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