Yamaha YZF-R1 Series Service Manual page 692

• Short circuit check
TIP
Disconnect the ECU related connectors before checking.
Refer to "PARTS CONNECTED TO THE ECU" on page 9-3.
Ground short circuit check "A"
Between relay unit coupler "2" and ground
Between handlebar switch (right) coupler "4" and
ground
Lines short circuit check "B"
Relay unit coupler
Handlebar switch (right) coupler
ECU coupler "5"
A
2
Br/W L/W R/W
L/R L/W R/W L/B L/Y Sb B/Y Sb/W
4
Is resistance ∞ Ω?
YES
→ Go to step 5.
NO
a. Replace the wire harness.
b. Start the engine and let it idle for approximately 5 seconds.
c. Check the condition of the DTC using the malfunction mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 8, and complete the service.
NO
→ Go to step 5.
5. Defective relay unit.
• Execute the diagnostic mode. (Code D50)
• Check the operating sound of the relay.
B
2
L R/L
4
9-195
brown/white–ground
blue/white–ground
red/white–ground
red/blue–ground
red/white–ground
brown/white–any other coupler terminal
blue/white–any other coupler terminal
red/white–any other coupler terminal
red/blue–any other coupler terminal
red/white–any other coupler terminal
red/blue–any other coupler terminal
blue/white–any other coupler terminal
Br/W L/W R/W L R/L
L/R L/W R/W L/B L/Y Sb B/Y Sb/W
5
P0657
Y/R P/W P/B O/G Gy/G O Gy/R
Lg/R L/R L/B O/B R/B G/B B
R/L G/Y Br/R Br/Y Br/B W/L Sb/W B
R/G Y/B L/W Y/L Sb R/L B/W B/W