Yamaha MTN850-A 2017 Service Manual page 418

Fault code No.
Item
4 Wire harness continuity.
5 Malfunction in ECU.
6 Delete the fault code and check
that the engine trouble warning
light goes off.
Fault code No. P0335
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of crankshaft posi-
tion sensor coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
2 Connection of ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
P0203
Fuel injector #3: malfunction in fuel injector #3.
Open or short circuit  Replace
the wire harness.
Between fuel injector coupler
and ECU coupler.
blue/black–blue/black
Between fuel injector coupler
and relay unit coupler.
red/blue–red/blue
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-157.
Start the engine and let it idle for
approximately 5 seconds.
Confirm that the fault code has
a condition of "Recovered"
using the malfunction mode of
the Yamaha diagnostic tool, and
then delete the fault code.
P0335
Crankshaft position sensor: no normal signals are received from
the crankshaft position sensor.
Unable to start engine
Unable to drive vehicle
—
—
—
Maintenance job
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
8-61
FUEL INJECTION SYSTEM
Execute the diagnostic mode.
(Code No. 38)
Operating sound  Go to item
6.
No operating sound  Go to
item 5.
Confirmation of service com-
Crank the engine, and then
check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 2.
Crank the engine, and then
check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 3.
pletion