Yamaha MTN1000 2016 Service Manual page 538

Fault code No.
Item
3-8 [For P2228/P2229] Short circuit
Between atmospheric pressure sensor output terminal (pink) "a" of ECU coupler and any other ECU
coupler terminal "b".
If there is continuity, replace the wire harness.
4 Installed condition of atmo-
spheric pressure sensor.
5 Defective atmospheric pressure
sensor.
6 Malfunction in ECU.
7 Delete the fault code and check
that the engine trouble warning
light goes off.
P2228, P2229
[P2228] Atmospheric pressure sensor: ground short circuit
detected.
[P2229] Atmospheric pressure sensor: open or power short circuit
detected.
b
Check for looseness or pinch-
ing.
Improperly installed sensor 
Reinstall or replace the sensor.
Execute the diagnostic mode.
(Code No. 02)
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
At sea level: Approx. 101 kPa
(757.6 mmHg, 29.8 inHg)
1000 m (3300 ft) above sea
level: Approx. 90 kPa (675.1
mmHg, 26.6 inHg)
2000 m (6700 ft) above sea
level: Approx. 80 kPa (600.0
mmHg, 23.6 inHg)
3000 m (9800 ft) above sea
level: Approx. 70 kPa (525.0
mmHg, 20.7 inHg)
Displayed value is incorrect 
Replace the atmospheric pres-
sure sensor.
Replace the ECU.
Refer to "REPLACING THE
ECU (Engine Control Unit)" on
page 8-194.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
8-121
FUEL INJECTION SYSTEM
a
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.
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.
Service is finished.