Yamaha MTN850-A 2017, Service Manual, Page: 414 / 560

FUEL INJECTION SYSTEM
8-57
1 Installed condition of O
2
sensor. Check for looseness or pinch-
ing.
Improperly installed sensor

Reinstall or replace the 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 7 and finish the service.
Condition is “Detected”

Go to
item 2.
2 Connection of O
2
sensor cou-
pler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
Improperly connected

Con-
nect the coupler securely or
replace the wire harness.
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 3.
3 Connection of wire harness
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).
Improperly connected

Con-
nect the coupler securely or
replace the wire harness.
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 4.
4 Wire harness continuity. Open or short circuit

Properly
connect or replace the wire har-
ness.
Between O
2
sensor coupler and
joint connector.
black/blue–black/blue
Between joint connector and
ECU coupler.
black/blue–black/blue
Between O
2
sensor coupler and
ECU coupler.
gray/green–gray/green
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 5.
5 Defective O
2
sensor. Check the O
2
sensor.
Defective

Replace the O
2
sensor.
Refer to “ENGINE REMOVAL”
on page 5-3.
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 7 and finish the service.
Condition is “Detected”

Go to
item 6.
6 Malfunction in ECU. Replace the ECU.
Refer to “REPLACING THE
ECU (Engine Control Unit)” on
page 8-157.
7 Delete the fault code and check
that the engine trouble warning
light goes off.
Confirm that the fault code has
a condition of “Recovered”
using the Yamaha diagnostic
tool, and then delete the fault
code.
Fault code No. P0132
Item
O
2
sensor: short circuit detected (power short circuit).