Evinrude E-tec 75 HP, Service Manual

Page: 118 / 344

118
SYSTEM ANALYSIS
IGNITION OUTPUT
Ignition Primary Circuit
Resistance Test
Disconnect the battery cables at the battery.
Calibrate ohmmeter to low ohms scale.
With key switch OFF, remove the
EMM
J1-B con-
nector and measure resistance of each primary
circuit. Note resistance reading between each pri-
mary wire and ground. Refer to engine wiring dia-
gram.
IMPORTANT:
A reading of less than 2 ohms is
acceptable. Make sure meter is calibrated to read
1 ohm or less.
Results:
Primary circuit resistance reading is higher than
5
Ω :
•
Repair primary circuit wiring or coil grounds as
needed and retest.
•
Replace faulty coils or wiring.
Primary circuit resistance reading less than 5
Ω
or
within specification and
EMM
ignition output volt-
age is 130 V or higher:
•
Refer to Secondary Winding Resistance Test
on p. 128. Repair high tension spark plug lead
or replace ignition coil and/or high tension spark
plug lead assembly.
Crankshaft Position Sensor (CPS)
Test
Use the
Evinrude
Diagnostics Software program
to check RPM reading. An RPM display higher
than zero indicates a CPS signal to the
EMM
.
Cranking RPM is typically 200 RPM or higher.
Observe Engine RPM and Power ON Time dis-
play fields of the engine
Monitor
screen. “ON
Time” should be continuous and should not reset
unless the key switch is turned OFF or power to
the
EMM
is interrupted.
Check CPS resistance (560
Ω
± 10%). Make cer-
tain ohmmeter is calibrated properly. Refer to
Crankshaft Position Sensor (CPS) Test on
p. 127.
Ignition Primary Circuit Resistance
0.090 ± 0.005 Ω .
1. Ohmmeter
2. J1-B
EMM
connector
3. Red meter lead, with pin adapter
4. Black meter lead to ground
002433
Engine Monitor Screen, Engine RPM display 006307