Yamaha VMX12 2001 Service Manual page 433

2. Engine stop switch
• Check the engine stop switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the engine stop switch OK?
YES
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?
YES
NO
Replace the right
handlebar switch.
NO
Replace the diode
assembly.
SIGNALING SYSTEM
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?
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.
8 - 41
ELEC
YES
The wiring
from the main switch
to the tachometer
coupler is faulty and
must be repaired.
YES
Replace the engine
oil level switch.
– +
".
NO
circuit
NO