Yamaha WR125R 2009, Service Manual

Page: 326 / 372

FUEL INJECTION SYSTEM
8-41
Communication error with the FI diagnostic tool
D36 Fuel injector
When the “MODE” button is
pressed, the fuel injector is
actuated five times at one-
second intervals, and the
“WARNING” LED on the FI
diagnostic tool comes on
each time the injector is actu-
ated.
Check the operating sound
of the injector five times.
D51 Radiator fan motor relay
When the “MODE” button is
pressed, the radiator motor
relay is actuated five times at
five-second intervals (2 sec-
onds on, 3 seconds off), and
the “WARNING” LED on the
FI diagnostic tool comes on
each time the relay is actuat-
ed.
Check the operating sound
of the radiator fan motor re-
lay five times.
D52 Headlight relay
When the “MODE” button is
pressed, the headlight relay
is actuated five times at five-
second intervals (2 seconds
on, 3 seconds off), and the
“WARNING” LED on the FI
diagnostic tool, the high
beam indicator light, and the
headlight come on each time
the relay is actuated.
Check the operating sound
of the headlight relay five
times.
D54 FID (fast idle solenoid)
When the “MODE” button is
pressed, the FID (fast idle so-
lenoid) is actuated five times
at one-second intervals, and
the “WARNING” LED on the
FI diagnostic tool comes on
each time the FID is actuat-
ed.
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.
• Connecting lead is not connected properly.
• The main switch is set to “OFF”.
• Malfunction in wire harness ECU coupler.
• Malfunction in the FI diagnostic tool coupler.
• Open or short circuit in wire harness.
• Malfunction in the FI diagnostic tool.
• Malfunction in the ECU.
Diag-
nostic
code
No.
Item Actuation Checking method