Maintenance Of The Mcu; Mcu (Motor Control Unit) Self-Diagnostic Function - Yamaha 2006 FJR1300AS Service Manual

The transmission gear display on the multi-function meter fails to indicate the selected gear.
1. Check the gear position sensor.
Refer to "CHECKING THE GEAR
POSITION SENSOR" on page 132
and "ADJUSTING THE GEAR PO-
SITION SENSOR" on page 50.
OK ↓
2. Check the gear position setting.
Refer to "Diagnostic code table (Di-
agnostic code No. Sh_ _65)".
OK ↓
Replace the meter assembly.
ET2D21021

MAINTENANCE OF THE MCU

Checking the MCU
1. Check:
• Terminals "1" of the MCU
Cracks/damages → Replace the MCU.
• Terminals "2" of the MCU couplers
Connection defective, contaminated, come-
off → Correct or clean.
NOTE:
If the MCU couplers are clogged with mud or dirt,
clean with compressed air.
ET2D21028

MCU (motor control unit) SELF-DIAGNOSTIC FUNCTION

The MCU (motor control unit) is equipped with a self-diagnostic function in order to ensure that the
YCC-S system is operating normally. If this function detects a malfunction in the YCC-S system, it im-
mediately operates the system under substitute characteristics and lights the YCC-S indicator and
warning light to alert the rider that a malfunction has occurred in the system. Once a malfunction has
been detected, a fault code is stored in the memory of the MCU (motor control unit). After the engine
has been stopped, the lowest fault code number appears on the odometer/tripmeter/fuel reserve trip-
meter LCD. Once a fault code has been displayed, it remains stored in the memory of the MCU (motor
control unit) until it is deleted.
NOTE:
If the engine trouble indicator "1", YCC-S indicator "2", and engine trouble warning light "3" all come on,
malfunctions have been detected in both the fuel injection system and the YCC-S system. If this occurs,
the fault codes for the fuel injection system take priority over those for the YCC-S system, so only the
fuel injection system fault codes will appear in the multi-function display. The fault codes for the YCC-
S system will be displayed in the multi-function display after all of the fault codes for the fuel injection
system have been deleted using the reinstatement method.
YCC-S (Yamaha Chip Controlled-Shift) SYSTEM
NG →
NG →
– 90 –
Replace the gear position sensor.
Replace the MCU (motor control unit).
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