Yamaha YXR70FX Service Manual page 291

Fault code No. 39
Diagnostic code No. d36
Order Item/components and probable
cause
1 Connections
• Injector coupler
• Main wire harness-ECU coupler
• Main wire harness fuel pump
coupler
2 Open or short circuit in the wire
harness.
3 Defective injector.
FUEL INJECTION SYSTEM
Symptom Open circuit detected in a injector.
Injector
Check or maintenance job
• Check the couplers for any pins
that may be pulled out.
• Check the locking condition of
the couplers.
• If there is a malfunction, repair it
and connect the coupler
securely.
• Repair or replace if there is an
open or short circuit.
• Between injector coupler and
ECU coupler.
(red/blue–red/blue)
(red–red)
• Execute the diagnostic mode.
(Code No.d36)
• Replace if defective.
Refer to "CHECKING THE FUEL
INJECTOR".
6 - 21
FI
Reinstatement
method
Cranking the
engine. (Con-
nect the fuel
injector cou-
pler.)