Pcm-To-Combination Meter Two-Way Serial Communication (Nc700Xd/Sd) - Honda NC700XA Service Manual

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PCM-to-COMBINATION METER TWO-WAY SERIAL COMMUNICATION (NC700XD/SD)

This motorcycle is equipped with the PCM-to-combination meter two-way serial communication system.
The PCM sends the following information to combination meter:
– High coolant temperature indicator signal
– Engine oil pressure indicator signal
– Engine speed signal
– MIL signal
– HISS indicator signal
– Gear position indicator signal
Combination meter sends the ignition switch OFF time information (elapsed time after the ignition switch is turned OFF) to the
PCM. The PCM uses this information for the EOP switch line open circuit detection with the VS sensor signal.
These signals are communicated between the combination meter and PCM via one wire. This wire is called the TXD/RXD line
(serial communication line).
ECT SENSOR
EOP SWITCH
CKP SENSOR
TR SENSOR
IMMOBILIZER
RECEIVER
WHEN THE SERIAL COMMUNICATION IS ABNORMAL
If there is any problem in the TXD/RXD line, the combination meter shows
following:
– MIL [1] and engine oil pressure indicator [2] stay on.
– Shift indicator "–" [3] is blinking.
– Tachometer, high coolant temperature indicator and HISS indicator do
not come on.
TXD/RXD line troubleshooting (page 22-11)
If there is any problem in the serial communication, the PCM stores the
DTC 86-1. Read the DTC (page 4-12).
DTC troubleshooting (page 4-40)
MIL troubleshooting (page 4-60)
To COMBINATION METER:
– High coolant temperature indicator signal
– Engine oil pressure indicator signal
– Engine speed signal
– HISS indicator signal
– MIL signal
– Gear position indicator signal
PCM
To PCM:
– Ignition switch OFF time information
GENERAL INFORMATION
TXD/RXD LINE
[1]
COMBINATION
METER
[2]
[3]
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