Yamaha MTN850-A 2017 Service Manual page 397

Fault code No.
Item
4 Defective O sensor heater.
2
5 Malfunction in ECU.
6 Delete the fault code and check
that the engine trouble warning
light goes off.
Fault code No. P0107, P0108
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of intake air pres-
sure sensor 1 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).
P0030
O sensor heater: defective heater controller detected.
2
Replace the O
2
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-157.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
P0107, P0108
[P0107] Intake air pressure sensor 1: ground short circuit detected.
[P0108] Intake air pressure sensor 1: open or power short circuit
detected.
Able to start engine
Able to drive vehicle
03
Displays the intake air pressure 1.
Operate the throttle while pushing the "
switch. (If the display value changes, the performance is OK.)
Maintenance job
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
8-40
FUEL INJECTION SYSTEM
sensor. Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered"  Go
to item 6 and finish the service.
Condition is "Detected"  Start
the engine, and then check the
condition of the fault code.
Condition is "Recovered"  Go
to item 6 and finish the service.
Condition is "Detected"  Go to
item 5.
TIP
For this check, also set the
start/engine stop switch to "ON".
Service is finished.
" side of the start/engine stop
Confirmation of service com-
Turn the main switch to "ON",
and then check the condition of
the fault code using the mal-
function mode of the Yamaha
diagnostic tool.
Condition is "Recovered"  Go
to item 7 and finish the service.
Condition is "Detected"  Go to
item 2.
pletion