Yamaha MTN850-A 2017 Service Manual page 395

Parts connected to the ECU
The following parts are connected to the ECU.
When checking for a power short circuit, the couplers must be disconnected from all of the following
parts beforehand.
• Crankshaft position sensor
• Fuel injector #1
• Fuel injector #2
• Fuel injector #3
• Ignition coil #1
• Ignition coil #2
• Ignition coil #3
• Throttle position sensor
• Accelerator position sensor
• Intake air pressure sensor 1
• Intake air pressure sensor 2
• Coolant temperature sensor
Fault code No. P0030
TIP
• If fault code numbers "P0030" and "P0112" are both indicated, take the actions specified for fault code
number "P0112" first.
• If fault code numbers "P0030" and "P0113" are both indicated, take the actions specified for fault code
number "P0113" first.
• If fault code numbers "P0030" and "P0122" are both indicated, take the actions specified for fault code
number "P0122" first.
• If fault code numbers "P0030" and "P0123" are both indicated, take the actions specified for fault code
number "P0123" first.
• If fault code numbers "P0030" and "P0222" are both indicated, take the actions specified for fault code
number "P0222" first.
• If fault code numbers "P0030" and "P0223" are both indicated, take the actions specified for fault code
number "P0223" first.
• If fault code numbers "P0030" and "P2135" are both indicated, take the actions specified for fault code
number "P2135" first.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
• Intake air temperature sensor
• O
• Lean angle sensor
• ABS ECU (electronic control unit)
• Air induction system solenoid
• Throttle servo motor
• Relay unit
• Headlight assembly
• Radiator fan motor relay
• Meter assembly
• Immobilizer unit
• Shift switch
P0030
O sensor heater: defective heater controller detected.
2
Able to start engine
Able to drive vehicle
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—
—
Maintenance job
8-38
FUEL INJECTION SYSTEM
sensor
2
Confirmation of service com-
pletion