Yamaha YZF-R125, Service Manual

Page: 311 / 356

FUEL INJECTION SYSTEM
8-40
Actuator operation table
Communication error with the FI diagnostic tool
Diag-
nostic
code
No.
Item Actuation Checking method
30 Ignition coil
When the “MODE” button is
pressed, the ignition coil is
actuated five times at one-
second intervals.
Illuminates the “WARNING”
LED on the FI diagnostic
tool.
Check the spark five times.
• Connect an ignition
checker.
36 Fuel injector
When the “MODE” button is
pressed, the fuel injector is
actuated five times at one-
second intervals.
Illuminates the “WARNING”
LED on the FI diagnostic
tool.
Check the operating sound
of the injector five times.
51 Radiator fan motor relay
Actuates the radiator fan mo-
tor relay for five cycles every
five seconds (on 2 seconds,
off 3 seconds).
Illuminates the engine trou-
ble warning light.
Check the operating sound
of the radiator fan motor re-
lay five times.
52 Headlight relay
Actuates the headlight relay
for five cycles of five sec-
onds. (ON 2 seconds, OFF 3
seconds)
Illuminates the “WARNING”
LED on the FI diagnostic
tool, the engine trouble warn-
ing light and headlight.
Check the operating sound
of the headlight relay five
times.
54 FID (fast idle solenoid)
When the “MODE” button is
pressed, the FID (fast idle so-
lenoid) is actuated five times
at one-second intervals.
Illuminates the “WARNING”
LED on the FI diagnostic
tool.
Check the operating sound
of the FID five times.
LCD Display Symptom Probable cause of malfunction
Waiting for con-
nection.... No signals are received
from the ECU.
• Improper connection in connecting lead.
• The main switch is set to “OFF”.
• Malfunction in the FI diagnostic tool.
• Malfunction in the ECU.
ERROR 4
Commands from the FI di-
agnostic tool are not ac-
cepted by the ECU.
• Set the main switch to “OFF” once, and then
set the FI diagnostic tool to the CO adjustment
mode or diagnostic mode.
• Vehicle battery is insufficiently charged.
• Malfunction in the FI diagnostic tool.
• Malfunction in the ECU.
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