Yamaha Z200N Service Manual page 388

TRBL
ANLS
Items
3. Erratic engine
speed
TROUBLE SHOOTING FOR HIGH-PRESSURE
DIRECT INJECTION
1. The engine is started, but will not run smoothly. The engine speed
drops during acceleration.
1. Check the medium/high-pressure fuel lines.
1) Check for fuel line leaks
2) Check the fuel pressure
(vapor separator and
mechanical fuel pump)
3) Check the operation of
the fuel injector
4) Check the injector
driver
5) Check the diagnosis
cord
6) Check the oxygen
density sensor
2. Check the ignition system.
1) Check the wire harness
2) Check the ignition spark
3) Check the ignition coil
4) Check the CDI unit output
peak voltage
3. Check the ignition timing.
1) Check the diagnosis
cords
Symptoms
Fuel pressure is
out of specification
5) Check the pulser coil output
peak voltage
6) Check the rectifier/regulator
output peak voltage
7) Check the lighting coil
output peak voltage
1 Check the pulser coil diagnosis cord
2 Check the crank position sensor
diagnosis cord
3 Check the engine cooling water
temperature sensor diagnosis cord
4 Check the fuel pressure sensor
diagnosis cord
5 Check the shift position switch
diagnosis cord
9-9
1 Check the fuses
2 Check the electric
fuel pump operation
3 Check the main relay
4 Check the driver relay
5 Check the pressure
regulator
6 Check the mechani-
cal fuel pump
E