BRP E 250 L HO AG B, Service Manual

Page: 108 / 460

System Analysis
Dynamic Tests
108
Dynamic Tests
Cylinder Drop Tests
Use the Evinrude Diagnostics software Dynamic
Tests to momentarily disable one cylinder while
the outboard is running.
•
The Dynamic Ignition test disables the ignition
and fuel injection circuits to a cylinder.
•
The Dynamic Fuel test momentarily disables
one fuel injector circuit.
By dropping one cylinder, RPM and running qual-
ity changes can be compared for each cylinder.
IMPORTANT:
Test the outboard at the RPM
where the problem is occurring. Use the test pro-
cedures to identify inconsistencies in voltages and
cylinder performance. Once a circuit has been
identified as malfunctioning, inspect all related wir-
ing and connections. Check all voltage inputs and
grounds; and perform resistance tests for all cir-
cuits before replacing any suspect components.
Dynamic Tests can be used with:
•
A timing light to determine how other cylinders
are affected by one cylinder being “dropped”; or
•
A digital multimeter to check voltage changes
on electrical circuits.
IMPORTANT:
DO NOT misinterpret tests run at
IDLE. The idle speed controller in the EMM com-
pensates to maintain a constant IDLE speed. The
Dynamic Tests screen includes a function to tem-
porarily disable the idle controller.
Fuel Control Adjustment
Use this test is to help identify a cylinder that may
be too rich or too lean. This feature should not be
used by itself to identify a faulty injector.
Evinrude Diagnostics software allows temporary
adjustments to the fuel flow characteristics of the
injectors. Factory fuel flow settings are restored
when power to the
EMM is returned to OFF.
Test the outboard at the RPM where the problem
is occurring.
If the outboard run quality improves with a fuel
control adjustment, eliminate other possibilities
before replacing an injector:
•
Refer to Fuel System Tests on p. 160.
•
Refer to Running Fuel System Tests on
p. 160.
IMPORTANT:
DO NOT misinterpret tests run at
IDLE. The idle speed controller in the EMM com-
pensates to maintain a constant IDLE speed.
Dynamic Tests Screen 009124
009294