Yamaha MBK MW125 2014 Service Manual page 320

3. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the meter assembly or head-
light assembly.
The coolant temperature fails to come on.
1. Check the coolant temperature sen-
sor.
Refer to "CHECKING THE COOL-
ANT TEMPERATURE SENSOR"
on page 8-67.
OK ↓
2. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the meter assembly or ECU.
Refer to "REPLACING THE ECU (en-
gine control unit)" on page 8-59.
The fuel meter fails to come on.
1. Check the fuel sender.
Refer to "CHECKING THE FUEL
SENDER" on page 8-66.
OK ↓
2. Check the entire signaling system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-19.
OK ↓
Replace the meter assembly or ECU.
Refer to "REPLACING THE ECU (en-
gine control unit)" on page 8-59.
The speedometer fails to operate.
1. Check the speed sensor.
Refer to "CHECKING OF THE
SPEED SENSOR AND SENSOR
ROTOR" on page 4-29.
OK ↓
NG →
Properly connect or replace the wire har-
ness.
NG →
Replace the thermostat assembly.
NG →
Properly connect or replace the wire har-
ness.
NG →
Replace the fuel pump.
NG →
Properly connect or replace the wire har-
ness.
NG →
Replace the speed sensor.
8-23
SIGNALING SYSTEM