Yamaha VMX12 2001, Service Manual

Page: 433 / 454

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ELEC
SIGNALING SYSTEM
YES NO
YES NO
YES
NO
YES
NO
2. Engine stop switch
• Check the engine stop switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the engine stop switch OK?
Replace the right
handlebar switch.
3. Diode assembly
• Disconnect the diode assembly coupler
from the wire harness.
• Connect the pocket tester (
Ω ×
1) to the
diode assembly coupler as shown.
• Measure the resistor resistance.
Positive tester probe
→
green
1
Negative tester probe
→
black/red
2
Resistor resistance
8.2
Ω
at 20 °C
• Is the resistor resistance within specifica-
tion?
Replace the diode
assembly.
4. Voltage
• Connect the pocket tester (DC 20 V) to the
tachometer coupler (wire harness side) as
shown.
Positive tester probe
→
red/black
1
Negative tester probe
→
ground
• Set the main switch to “ON”.
• Set the engine stop switch to “
”.
• Measure the voltage (12 V) of brown
1
at
the tachometer coupler.
• Is the voltage within specification?
The wiring circuit
from the main switch
to the tachometer
coupler is faulty and
must be repaired.
5. Engine oil level switch
• Check the oil level warning light bulb and
socket for continuity.
• Are the oil level warning light bulb and
socket OK?
• Drain the engine oil and remove the engine
oil level switch from the oil pan.
• Check the engine oil level switch for conti-
nuity.
Refer to “CHECKING THE SWITCHES”.
• Is the engine oil level switch OK?
This circuit is OK. Replace the engine
oil level switch.