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
To Next Page
Loading...
