Yamaha MT-09 2021 Service Manual page 527

3. Connection of ECU coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
→ Go to step 4.
NO
a. Connect the coupler securely or replace the wire harness.
b. Start the engine and let it idle for approximately 1 minute.
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 4.
4. Wire harness continuity.
• Disconnect the O
2
• Open circuit check
Between O sensor coupler "1" and ECU cou-
2
pler "2"
Between O sensor coupler "1" and ignition fuse
2
1 holder "3"
3
*. MTN890
**. MTN890D
Is resistance 0 Ω?
YES
→ Go to "Short circuit check".
NO
a. Replace the wire harness.
b. Start the engine and let it idle for approximately 1 minute.
c. Check the condition of the DTC using the malfunction mode of the YDT.
sensor coupler "1", ECU coupler "2" and ignition fuse 1 "3".
2
1
Y/R
Lg/R
R P/B
R/L
Gy/G B/L
R/G Y/R
gray/green–gray/green
pink/black–pink/black
black/blue–black/blue
red–red
P/B O/G Gy/R O
L/B G/B R/B B
G/Y B
Y/B L/W R/L B/W B/W
9-97
P00D1, P2195
*
2
L/B Y/L P/W P V
L/W B/Y Gy/G Br/W
L/Y L/W G/W G/W
**
2
L/B Y/L O/W Lg/L P/W P V
L/W B/Y Br/L G/L Gy/G Br/W
L/Y L/W Lg/B G/W G/W
L L Gy
B/L B/L
W/G W/Y
L L Gy
B/L B/L
W/G W/Y