Yamaha YZF-R125 Service Manual page 311

YamahaR125.COM
Actuator operation table
Diag-
nostic
code
No.
30 Ignition coil
36 Fuel injector
51 Radiator fan motor relay
52 Headlight relay
54 FID (fast idle solenoid)
Communication error with the FI diagnostic tool
LCD Display
Waiting for con-
nection....
ERROR 4
Item
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.
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.
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.
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.
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.
Symptom
No signals are received
from the ECU.
Commands from the FI di-
agnostic tool are not ac-
cepted by the ECU.
FUEL INJECTION SYSTEM
Actuation
Probable cause of malfunction
• Improper connection in connecting lead.
• The main switch is set to "OFF".
• Malfunction in the FI diagnostic tool.
• Malfunction in 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.
8-40
Checking method
Check the spark five times.
• Connect an ignition
checker.
Check the operating sound
of the injector five times.
Check the operating sound
of the radiator fan motor re-
lay five times.
Check the operating sound
of the headlight relay five
times.
Check the operating sound
of the FID five times.