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E
TRBL
ANLS
YAMAHA DIAGNOSTIC SYSTEM
• Fuel injector
A voltage is applied to the injector of
the selected cylinder, the injector is
activated, and then the fuel system is
checked. The fuel is injected 20 items
within two seconds.
• Electric fuel pump
A voltage is applied to the electric fuel
pump, the electric fuel pump is oper-
ated for ten seconds.
• Electric oil pump
The electrical oil pump is operated by
a signal sent from the ECM for six sec-
onds. Enables to check if oil has been
spurted out from the electrical oil
pump
(5) Active Test
The ignition and fuel are cut for each
cylinder, one at a time, and the engine
speed is checked for changes to deter-
mine whether or not the cylinder is mal-
functioning. (If there is no change in the
engine speed, the cylinder is faulty.)
The ignition signal and the fuel injec-
tion are paused for five seconds.
(6) Data Logger
Two out of six items (engine speed, fuel
pressure, battery voltage, oxygen den-
sity sensor, throttle position, and water
temperature), are selected and 13 min-
utes of their recorded data are dis-
played on a graph. The operating time
as compared to the engine speed and
the total operating time are also dis-
played.
(7) ECM No.
The ECM part number is read from the
outboard engine’s ECM and is dis-
played.
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