Evinrude E-Tec 40 HP, Service Manual

Page: 78 / 426

76
SYSTEM ANALYSIS
DYNAMIC TESTS
DYNAMIC TESTS
Cylinder Drop Tests
Use the
Evinrude Diagnostics
sof tware
Dynamic
Tests
to moment arily disable one cylinder while
the outboard is running.
•
The Dynamic Ig nition test disables the ignition
and fuel injection circuits to a cylinder.
•
The Dynamic Fuel te st mome ntarily disable s
one fuel injector circuit.
By dropping one cylinder, RPM and running qual-
ity changes can be compared for each cylinder.
IMPORTANT:
Test the out board at the RPM
where the problem is occurring. Use the test pro-
cedures to identify inconsistencies in voltages and
cylinder perfo rmance. On ce a circuit has been
identified a s malfu nctioning, inspect all rela ted
wiring and connections. Check all vo ltage in puts
and grounds; and perform resistance tests for all
circuits 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 mult imeter to check volt age change s
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 fun ction 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 allo ws temporary
adjustments to the fuel flo w characteristics of t he
injectors. Factory fuel flow settings are restore d
when power to the
EMM
is returned to OFF.
Test the outboard at the RPM where the problem
is occurring.
If th e outbo ard run q uality improves with a fue l
control adjustment, eliminate ot her possibilities
before replacing an injector:
•
Refer to
Fuel System Pressure Test
on p. 137.
•
Refer to
Running Fuel System Tests
on p. 85.
IMPORTANT:
DO NOT misinterpret tests run at
IDLE. The idle speed controller in the
EMM
com-
pensates to maintain a constant IDLE speed.
Inductive Amp Meter Test
Use a n ind uctive amp me ter to monito r battery
charging and current flow . Ident ifying erratic
amperage in a circuit c an b e used to isolate a
problem component.
Dynamic Test Screen
008570A
008575A