Yamaha MT-09 2021 Service Manual page 552

3. Wire harness continuity.
• Disconnect the coolant temperature sensor coupler "1" and ECU coupler "3".
• Remove the joint coupler cap "2".
• Open circuit check
Between coolant temperature sensor coupler
"1" and ECU coupler "3"
Between coolant temperature sensor coupler
"1" and joint coupler "2"
Between joint coupler "2" and ECU coupler "3"
1
G/W B
2
L/W W L/W W B
B B/L B B B B B
*. MTN890
**. MTN890D
Is resistance 0 Ω?
YES
→ Go to step "Short circuit check".
NO
a. Replace the wire harness.
b. Turn the main switch to "ON", and then check the condition of the DTC using the malfunction
mode of the YDT.
Is it in the "Recovered" condition?
YES
→ Go to step 7, and complete the service.
NO
→ Go to step "Short circuit check".
• Short circuit check
TIP
Disconnect the ECU related connectors before checking.
Refer to "PARTS CONNECTED TO THE ECU" on page 9-4.
*
3
L/B Y/L P/W
L/W B/Y Gy/G
L/Y L/W
B L/B L/B Y/B Y/B
B/L L/R L/R L/R L/R
[P0117, P0118] green/white–green/white
[P0118] black–black
[P0118] black/blue–black/blue
P V L L Gy
Br/W B/L B/L
G/W G/W W/G W/Y
9-122
P0117, P0118
**
3
L/B Y/L O/W P/W P V
L/W B/Y Br/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