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 quality changes can be compared for each cylinder.
IMPORTANT: Test the outboard at the RPM where the problem is occurring. Use the test procedures to identify inconsistencies in voltages and cylinder performance. Once a circuit has been identified as malfunctioning, inspect all related wiring and connections. Check all voltage inputs 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 voltmeter to check voltage changes on electrical circuits.
Dynamic Tests Screen
IMPORTANT: DO NOT misinterpret tests run at IDLE. The idle speed controller in the EMM compensates to maintain a constant IDLE speed. The Dynamic Tests screen includes a function to temporarily 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 Pressure Test on p. 178.
Refer to Running Fuel System Tests on p. 123.
IMPORTANT: DO NOT misinterpret tests run at
IDLE. The idle speed controller in the EMM compensates to maintain a constant IDLE speed.
Inductive Amp Meter Test
Use an inductive amp meter to monitor battery charging and current flow. Identifying erratic amperage in a circuit can be used to isolate a problem component.
