Yamaha MTN850-A 2017 Service Manual page 447

Fault code No.
Item
4 Defective lean angle sensor.
5 Malfunction in ECU.
6 Delete the fault code and check
that the engine trouble warning
light goes off.
Fault code No. P1606, P1607
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 2 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).
P1604, P1605
[P1604] Lean angle sensor: ground short circuit detected.
[P1605] Lean angle sensor: open or power short circuit.
Refer to "CHECKING THE
LEAN ANGLE SENSOR" on
page 8-165.
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.
P1606, P1607
[P1606] Intake air pressure sensor 2: ground short circuit detected.
[P1607] Intake air pressure sensor 2: open or power short circuit
detected.
Able to start engine
Able to drive vehicle
04
Displays the intake air pressure 2.
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.
Improperly connected  Con-
nect the coupler securely or
replace the wire harness.
8-90
FUEL INJECTION SYSTEM
Turn the main switch to "ON",
then to "OFF", and then back to
"ON".
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 6 and finish the service.
Condition is "Detected"  Go to
item 5.
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.
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.
pletion