FUEL DELIVERY TESTS
FUEL DELIVERY TESTS
Protect against hazardous fuel spray.
Before starting any fuel system service, carefully relieve fuel system pressure.
Refer to Relieving Fuel System Pressure on p. 143.
Check the Evinrude Diagnostics software Occurred Faults screen for current service codes
before troubleshooting. Correct any problems and clear the codes FIRST.
Inspect all fuel hoses, filters, and connections.
Check quality of fuel supply.
Fuel Pump Static Test
Use the Evinrude Diagnostics software Fuel Pump test to activate the electric fuel pump. If the pump runs, t he EMM a nd fuel pump circuit are not at fault.
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Static Tests Screen
If the pump does not run:
- The EMM controls power to the fuel pump (purple/black wire). Check voltage at p in 1 of fuel pump connector. Voltage should be 12 V when KEY is first ON, when fuel pump test activated, or when outboard is cranking or running.
- Use an ohmmeter to check continuity bet ween pin 2 of fuel pump connector and ground.
- Refer to Circulation Pump Resistance Test on p. 141.
If the pump runs:
• Refer to Fuel System Pressure Test on p. 139.
• Refer to Running Fuel System Tests on p. 86.
Fuel Injector Static Test
Use the Evinrude Diagnostics software Fuel Injector Static Test to activate each fuel injector. Listen for an audible click from each injector when it is actuated. If the injector activates, the EMM and injector circuits are not at fault.
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Static Tests Screen
IMPORTANT: This test is operating the injectors with 30 V on the system voltage (55 V) circuit. The start assist circuit (SAC) of the EMM converts battery voltage (12 V) to 30 V of system voltage. Battery must be fully charged and connections must be clean and tight. Injector activation should be carefully confirmed.
Results:
No injectors actuate:
• Use the Monitor screen of the diagnostics software t o make su re volt age is present on the system voltage circuit.
• Refer to Running Fuel System Tests on p. 86.
Some injectors actuate; some do not:
• For non-working injectors, test the resistance of individual injector circuits
between the injector connector and injector control wire at the EMM.
• See Fuel Injector Resistance Test on p. 141.
All injectors actuate:
• Refer to Running Fuel System Tests on p. 86.
Running Fuel System Tests
Run or crank the outboard.
Use the Evinrude Diagnostics software Monitor screen to check system voltage. If voltage is low, or drops as RPM increases, refer to Stator Voltage** Output Test on p. 96.
Use an inductive timing light to monitor the injector control wire (connector pin 2) for each injector. Make sure the pickup is attached to only one wire. Flashes on the timing light indicate current in the circuit is being switched by the EMM. The Dynamic Tests screen allows the control signal to be turned off to a particular injector.
IMPORTANT: Some timing lights may not flash consistently at cranking speeds. Always check the orientation of the timing light pickup and the operation of the timing light.
Results:
No light activation on any injector wires (outboard cranks and starter turns flywheel):
- Check stator input to EMM, CPS operation, and all grounds and wiring connections.
- Eliminate all other possibilities to isolate a faulty EMM.
Irregular or n o light activation o n some injector wires:
- Test the resistance of individual injector circuits between the injector connector and injector control wire at the EMM.
- Check battery cable connections.
- Make sure all grounds are clean and tight.
• See Fuel Injector Resistance Test on p. 141.
Steady light activation o n all injector wires and consistent voltage readings, EMM injector control function is good:
• Use the diagnostics software Dynamic Fuel Test to isolate a faulty cylinder.
See DYNAMIC TESTS on p. 77.
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Dynamic Tests Screen
• Refer to Fuel Injector Pressure Test on p. 140.
• Refer to Fuel System Pressure Test on p. 139.
