IGNITION
90-855347R1 JANUARY 1999 Page 2A-7
Flywheel
24 teeth under the flywheel ring gear provide engine rpm and crankshaft position informa-
tion to the ECM through the crank position sensor.
Ignition Coils
Inductive type ignition coils are used on the DFI engines.
Ignition Coil Ohm Test
Connect meter leads between primary terminal (GRN/Striped)
and ground (Black) terminal pin.
0.38 - 0.78
Connect meter leads between spark plug wire/high voltage
tower and ground terminal pin.
8.1 - 8.9 k
Crank Position Sensor
Senses 24 teeth located on flywheel under ring gear. Supplies the ECM with crank posi-
tion information and engine speed. If sensor should fail, the engine will stop running.
Throttle Position Sensor (TPS)
Two (2) Throttle Position Sensors are used in conjunction with one another. If one sensor
should fail, the dash mounted CHECK ENGINE light will light and the warning horn will
sound. RPM will be limited to 3000 rpm. If both TPS’s should fail, rpm will be reduced to
idle by the ECM. TPS settings are not adjustable. TPS settings can be monitored with the
Digital Diagnostic Terminal through the ECM.
Charging System Alternator
Battery charging system is contained within the belt driven alternator, including the regu-
lator. At cranking speeds, electrical power for the engine is provided by the boat battery
– minimum recommended size is 750 CCA, or 1,000 MCA, cold cranking amperes. Above
550 RPM, all electrical power is provided by the alternator. Should engine rpm drop below
550 RPM, the alternator is not capable of providing sufficient output and the battery be-
comes the primary source of electrical power.
Alternator output (when hot) to the battery @ 2000 RPM is approximately 33 - 38 am-
peres.
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