Digital Distributorless Ignition System (Ddis) - MerCruiser GM4 Service Manual

Digital Distributorless Ignition System (DDIS)

Is spark normal?
NO
Is spark plug wire good?
YES
Is the ignition amplifier power
supply normal when the
ignition switch is turned on ?
YES
Is the ignition coil normal?
(Check the primary and
secondary resistor insulation
resistance.)
YES
Is the motion sensor
normal? (Check resistance
of motion sensor.)
YES
Is the shift interrupter
switch normal?
YES
Index
1C- 8 - TROUBLESHOOTING
THE ENGINE FAILS TO START.
YES
Is the spark plug normal?
NO
NO
Is the engine harness
power supply normal?
NO
NO
NO
NO
YES
Replace spark plug wire.
The engine harness, battery
NO
ignition key, ignition amplifier
ground, or other parts are
defective.
YES
Replace the motion sensor.
Repair or replace the
shift interrupter switch.
The ignition amplifier
is defective.
Replace the spark plug.
Parts other than the
DDIS are defective.
The ignition amplifier
is defective.
Replace the ignition coil.
90-816462 2-695