Evinrude E-tec 75 HP, Service Manual, Page: 111 / 344

111
SYSTEM ANALYSIS
SPECIALIZED TEST PROCEDURES
5
Ignition System Output
Use the timing light to monitor each spark plug
lead for a consistent flash. The strobe should indi-
cate one flash per revolution. Intermittent output
or multiple flashes per revolution indicate
improper ignition control.
Test ignition system grounds, primary circuit resis-
tance, and
EMM
output voltages prior to replacing
any components.
Fuel Injector/Oil Injection Pump Activation
Use the timing light to monitor each fuel injector or
the oil injector pump lead(s). The strobe of the
light indicates current in the circuit.
Test all grounds, circuit resistance(s), and circuit
voltages prior to replacing
EMM
for faulty injector
or pump control function.
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.
Engine Monitoring Information
Use the
Evinrude
Diagnostics Software program
to access the engine
Monitor
screen. This screen
display provides engine information as it is occur-
ring. Circuits are monitored for actual voltages or
the condition of the circuit. Switch and sensor cir-
cuits, battery voltage (12 V), system voltage
(55 V), and ignition voltage
are continuously moni-
tored.
IMPORTANT:
The engine
Monitor
screen of the
diagnostics program does not offer voltage infor-
mation for all circuits.
1. Timing light pick-up
2. Spark plug lead
005081
2
1
Engine Monitor Screen 006307