Troubleshooting - Yamaha VMX12H Supplementary Service Manual

TROUBLESHOOTING

TroubleshootingChart (1)
Fuel pump fails to operate after engine is
started.
I
t
Start the engine and the fuel pump input
voltage (Blue/Black lead).
Check ignitor unit output voltage condition
(Orange lead) by testing No. 1 (rear)
cylinder minimum spark gap. (Refer to
Ignition System Troubleshooting)
I
I
Measure ignitor unit input voltage
(Red/White lead).
I
Check engine stop/main switch, main
fuse and battery.
Replace faulty parts and/or charge battery.
FUEL PUMP SYSTEM
, More than 11V
Less than 11V
O K
NO
1 2 v
I
No voltage
1
Faulty and/or discharge
Check fuel pump, replace if necessary.
Check fuel pump relay ground lead.
Replace ignitor unit.
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I
NO
7-54