Yamaha YZF-R1 Series Service Manual page 731

→ Go to step 4.
NO
a. Connect the coupler securely or replace the wire harness.
b. Execute the diagnostic mode. (Code D41)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to step 4.
4. Wire harness continuity.
• Disconnect the secondary injector #2 coupler "1", ECU coupler "2" and relay unit coupler "3".
• Open circuit check
Between secondary injector #2 coupler and ECU
coupler
Between secondary injector #2 coupler and relay
unit coupler
2
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
Is resistance 0 Ω?
YES
→ Go to "Short circuit check".
NO
a. Replace the wire harness.
b. Execute the diagnostic mode. (Code D41)
Is it hear operating sound?
YES
→ Go to step 6.
NO
→ Go to "Short circuit check".
• 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 secondary injector #2 coupler "1" and
ground
Lines short circuit check "B"
Secondary injector #2 coupler
sky blue/white–sky blue/white
red/blue–red/blue
1
Sb/WR/L
sky blue/white–ground
red/blue–ground
sky blue/white–any other coupler terminal
red/blue–any other coupler terminal
9-234
P21D0
3
Br/W L/W R/W L R/L
L/R L/W R/W L/B L/Y Sb B/Y Sb/W