Yamaha YZF-R1 Series Service Manual page 795

EAS20670
90_ABS
EAS33300
TROUBLESHOOTING
Item
CAN communication (between ECU and hydraulic unit assembly)
Procedure
1. Defective coupler between the ECU and the hydraulic unit assembly
• Check the coupler for any pins that may be pulled out.
• Check the locking condition of the coupler.
TIP
Turn the main switch to "OFF" before disconnecting or connecting a coupler.
Is check result OK?
YES
→ Go to step 2.
NO
→ If there is a malfunction, repair it and connect the coupler securely.
2. Wire harness continuity.
• Disconnect the ECU coupler "1", joint coupler "2" and ABS ECU coupler "3".
• Open circuit check
Between ECU coupler and joint coupler
Between joint coupler and ABS ECU coupler
1
L/B
L/W
*. Joint coupler for YZF-R1
**. Joint coupler for YZF-R1M
Is resistance 0 Ω?
YES
→ Go to "Short circuit check".
P/W P V L L/R Gy
B/Y Gy/G Br/W B/L W W/B
L/Y L/W Gy/Y G/W G Gy/B W/L
2
*
L/W L/W L/W L/W L/W L/W L/B L/B L/B L/B L/B L/B
**
L/W L/W L/W L/W L/W L/W L/W
L/B L/B L/B L/B L/B L/B L/B
9-298
blue/white–blue/white
blue/black–blue/black
blue/white–blue/white
blue/black–blue/black
3
Gy/B L Y G R/B B L/W
L/W
R/W
G/O W/L L B W W L/B
90_ABS
B/W
B