Yamaha F115A - TROUBLE SHOOTING FOR ELECTRIC FUEL INJECTION

9-7
E
TRBL
ANLS
TROUBLE SHOOTING FOR ELECTRIC FUEL
INJECTION
TROUBLE SHOOTING FOR ELECTRIC FUEL INJECTION
9
Items Symptoms
1. Poor starting/
Engine will
not start
1. No firing. The starter motor cranks the engine, but no firing is
generated in the cylinder.
2. The firing is generated in the cylinder, but the engine soon stops.
3. Start-up time is too long. The engine will not start-up easily.
1. Check the high-pressure fuel lines.
2. Check the ignition system.
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