Evinrude E-tec 75 HP - Electrical and Ignition

85
SYSTEM ANALYSIS
FUEL DELIVERY TESTS
5
Results:
No injectors actuate:
• Use the Monitor screen of the diagnostics soft-
ware to make su re volt age is present on the
system voltage circuit.
• Refer to Running Fuel System Tests on p. 85.
Some injectors actuate; some do not:
• For non-working injectors, test the resistance of
injector circuit between the injector connector
and injector control wire at the EMM.
• See Fuel Injector Resistance Test on p. 139.
All injectors actuate:
• Refer to Running Fuel System Tests on p. 85.
Running Fuel System Tests
Run or crank the outboard.
Use the Evinrude Diagnostics sof tware Monitor
screen to check syste m voltage. If vo ltage is low,
or drops as RPM increases, refe r to Stator Volt-
age Output Test on p. 97.
Use an inductive timing light to monit or the injec-
tor control wire (connector pin 2) for each injector.
Make sure the pickup is attached to only one wire.
Flashes on th e timing light indicate current in the
circuit is being switche d by the EMM. The
Dynamic Tests screen allows the contr ol 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 oper-
ation of the timing light.
Results:
No light activation on any injector wires (outboa rd
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 lig ht activa tion o n some in jector
wires:
• Test the resistance of individual injector circuits
between the injector connector and injector con-
trol wire at the EMM.
• Check battery cable connections.
• Make sure all grounds are clean and tight.
• See Fuel Injector Resistance Test on p. 139.
Steady light activation o n all in jector wire s an d
consistent voltage readings, EMM injector contro l
function is good:
• Use the diagnostics software Dynamic Fuel Test
to isolate a faulty cylinde r. See DYNAMIC
TESTS on p. 76.
• Refer to Fuel Injector Pressure Test on p. 138.
• Refer to Fuel System Pressure Test on p. 137.
Dynamic Tests Screen 008570A