Honda CBR650F Service Manual page 93

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PGM-FI SYSTEM
SERVICE INFORMATION
GENERAL
• This section covers electrical system service of the PGM-FI system. For other service and fuel supply system, see Fuel System
section (page 7-2).
• The PGM-FI system is equipped with the self-diagnostic system. When performing the troubleshooting, read "PGM-FI
Troubleshooting Information" carefully (page 4-5), and inspect and troubleshoot according to the DTC.
• A faulty PGM-FI system is often related to poorly connected or corroded connectors. Check those connections before
proceeding.
• Use a digital tester for PGM-FI system inspection.
• If the ECM is replaced, perform the Key Registration Procedures (page 22-3).
• The following color codes are used throughout this section.
Bl = Black G = Green
Br = Brown Gr = Gray
Bu = Blue Lb = Light Blue
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.
– High coolant temperature indicator signal
– Engine speed signal
– MIL signal
– HISS indicator signal
– Fuel pulse signal (for fuel mileage meter)
– Neutral position signal
The combination meter sends the vehicle speed signal information to the ECM.
These signals are communicated between the ECM and combination meter via one wire. This wire is called the serial
communication (TXD/RXD) line.
ECT SENSOR
CKP SENSOR
IMMOBILIZER
RECEIVER
NEUTRAL
SWITCH
4-4
Lg = Light Green
O = Orange
P = Pink
SERIAL COMMUNICATION LINE
To COMBINATION METER:
– High coolant temperature indicator signal
– Engine speed signal
– MIL signal
– HISS indicator signal
– Fuel pulse signal
ECM
– Neutral position signal
To ECM:
– VS sensor signal
R = Red Y = Yellow
V = Violet
W = White
COMBINATION
METER
VS SENSOR