Honda CBR650RA Shop Manual page 107

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ECM-to-COMBINATION METER TWO-WAY SERIAL COMMUNICATION
This motorcycle is equipped with the ECM-to-combination meter two-way serial communication system.
The ECM sends the following information to the combination meter.
– Torque control indicator signal
– Coolant temperature gauge signal
– Engine speed signal
– HISS indicator signal
– MIL signal
– Fuel pulse signal (for fuel mileage meter)
– Gear position indicator signal
– Speed signal
These signals are communicated between the ECM and combination meter via one wire. This wire is called the serial
communication (TXD/RXD) line.
ABS MODULATOR
CPU
REAR WHEEL
FRONT WHEEL
SPEED SENSOR SPEED SENSOR
ECT SENSOR
CKP SENSOR
IMMOBILIZER
RECEIVER
GEAR POSITION
SWITCH
COMBINATION METER INDICATION WHEN THE SERIAL COMMUNICATION LINE IS ABNORMAL
If there is any problem in the serial communication line, the combination
meter shows following:
– MIL [1] and torque control indicator [2] stays on
– Tachometer [3] does not operate (though the engine is running)
– Section A display [4] indicates "–"
– Torque control off indicator [5] does not come on
Serial communication line troubleshooting (page 21-7).
If there is any problem in the serial communication, the ECM stores the
DTC P0600.
– ED, IIED, IIIED, IVED, FO, IIFO, KO, IIKO models (page 4-38)
– MA, IIMA, IN, TH, IITH, U, IIU, BR, IIBR models (page 4-69)
CPU
ECM
SERIAL COMMUNICATION LINE
To COMBINATION METER:
– Torque control indicator signal
– Coolant temperature gauge signal
– Engine speed signal
– HISS indicator signal
– MIL signal
– Fuel pulse signal
– Speed signal
[3]
(All indicators and segments displayed)
PGM-FI SYSTEM
COMBINATION
METER
[2]
[4]
[5]
[1]
4-3