Yamaha MTN850-A 2017 Service Manual page 408

Fault code No. P0122, P0123, P0222, P0223, P2135
TIP
If a fault code other than No. P2135 (P0122/P0123/P0222/P0223) is detected, perform troubleshooting
first.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
01
Procedure
Tool display
13
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of throttle position
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).
3 Wire harness continuity.
P0122, P0123, P0222, P0223, P2135
[P0122] Throttle position sensor: ground short circuit detected.
[P0123] Throttle position sensor: open or power short circuit
detected.
[P0222] Throttle position sensor: ground short circuit detected.
[P0223] Throttle position sensor: open or power short circuit
detected.
[P2135] Throttle position sensor: output voltage deviation error.
Able/Unable to start engine
Able/Unable to drive vehicle
01, 13
Throttle position sensor signal 1
• 11–21 (fully closed position)
• 96–106 (fully open position)
• Check with throttle valves fully closed.
• Check with throttle valves fully open.
Throttle position sensor signal 2
• 9–23 (fully closed position)
• 94–108 (fully open position)
• Check with throttle valves fully closed.
• Check with throttle valves fully open.
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.
Open or short circuit  Replace
the wire harness.
8-51
FUEL INJECTION SYSTEM
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 8 and finish the service.
Condition is "Detected"  Go to
item 2.
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 8 and finish the service.
Condition is "Detected"  Go to
item 3.
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 8 and finish the service.
Condition is "Detected"  Go to
item 4.
pletion