Transcript DC CDI Troubleshooting

DC CDI Troubleshooting
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DC CDI
Troubleshooting
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Objectives
The participants will identify components
and testing procedures for a Sea Doo Battery
Powered Ignition system. This will be
demonstrated by the participants completing
a written exam with 80 percent accuracy.
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Systematic Approach
To insure an efficient and accurate diagnosis, the
following systematic approach must be used:
1. Battery inspection
2. MPEM advanced diagnostic test
3. Spark test
4. MPEM CDI Output Test
5. Trigger Coil Output Test
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1. Battery Inspection
 The first step is to insure that the craft has a
fully charged battery .
 Battery service should begin with a thorough
visual inspection:
 Check for cracks in the battery case and
broken terminals.
 Check for cracked or broken cables.
 Check for loose battery cable connections.
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Battery Inspection (cont’d)
 Visual inspection (cont’d):
 Check the electrolyte fluid level.
 Check for cloudy or discolored electrolyte
caused by overcharging or vibration.
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Battery Load Test (cont’d)
 The next step is to
perform a battery load
test.
 A battery load tester
provides important
information consisting
of open battery
voltage, voltage under
load and internal
resistance.
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Battery Load Test (cont’d)
 Battery Load Testing procedures:
 Install the load tester in parallel with the
battery.
 Load the battery by turning the load
increase control until the ammeter reads 3
times the amp-hour rating of the battery.
 Maintain the load for 15 seconds, and note
the voltmeter reading.
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Battery Load Test (cont’d)
If the voltmeter
reading during 15
second test is:
• 9.6 volts or
higher, the
battery is good.
• 9.5 volts or
lower, the
battery is
defective and
needs
replacement.
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2. MPEM advanced diagnostic test
 The next
step is the
MPEM
diagnostic
test.
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2. MPEM advanced diagnostic test
 Start by
removing
the safety
lanyard
from DESS
post.
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2. MPEM advanced diagnostic test
 Press 5 times on the
watercraft
start/stop button.
 1 short beep and 1
long beep must be
heard (they validate
beginning of
diagnostic mode).
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MPEM advanced diagnostic test
 Install safety lanyard on watercraft DESS post.
 Press the watercraft start/stop button again.
 If everything is correct, the engine will start.
 Otherwise, refer to the following chart.
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MPEM advanced diagnostic test
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MPEM advanced diagnostic test
 If no beeps occur and the engine does not start
or crank over, then test for battery voltage at
the MPEM.
 Meter connection:
 Positive meter lead to Amphenol connecter
number 3, pin 26
 Negative meter lead to Amphenol connecter
number 3, pin 24
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Disconnect Amphenol Connector #3
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Amphenol Connector #3
Pin #24
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Pin #26
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Amphenol Connector #3
Pin #24
Pin #26
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Meter reading should be near battery voltage
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MPEM advanced diagnostic test
 If battery voltage is not present at the
Amphenol connector, then test the main
battery fuse.
 If the main battery fuse checks okay, then use
a test light to trace the wire for an open.
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3. Spark Test
 The next step is to
test for strong,
quality spark that
will fire the spark
plugs under
compression.
 A neon spark tester
should be used for
this test.
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3. Spark Test (cont’d)
 Install the neon
testers in series
with the high
tension leads.
 While cranking
the engine,
observe for
spark on both
cylinders.
Observe for spark in the neon spark testers
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3. Spark Test (cont’d)
 If spark occurs in both cylinders then the
ignition system is operating properly and no
other tests are needed.
 If spark does not occur in either cylinder, then
an ignition system failure is present.
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Direct Voltage Adapters
 The input or output voltages of the remaining
ignition system tests are pulse voltages.
 Ignition pulse voltages increase and decrease
within extremely short periods of time and can
not be tested with a typical volt meter.
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Peak Voltage Adapters (cont’d)
 Rather than using an expensive oscilloscope,
which is suitable for measuring short-length
pulses, the marine industry utilizes a direct
voltage adapter (DVA).
 The DVA must be used with a commercially
available digital multimeter (impedance
10M/DCV minimum).
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Peak Voltage Adapters (cont’d)
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Peak Voltage Adapters (cont’d)
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4. MPEM CDI Output Test
 The 4th step is to check for CDI output.
 The CDI output of the MPEM should be 100
volts or higher at engine cranking speeds.
 CDI output is checked at the ignition coil.
 Proper connection to the ignition coil is
imperative, the correct polarity must be
observed.
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Proper connection
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Positive DVA lead to white wire at ignition coil
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Negative DVA lead to chassis ground
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While cranking the
engine the meter reading
should be 100 volts or
more
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MPEM CDI Output Test (cont’d)
 If the peak voltage is lower than 100 volts,
reverse the meter leads and recheck the peak
voltage.
 If the peak voltage is still lower than
specifications, disconnect the ignition coil’s
primary leads and test again.
 If the peak voltage is still lower than
specification, reverse the meter leads again.
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MPEM CDI Output Test (cont’d)
 If the voltage reading is 100 volts or more,
then the ignition system from the MPEM
back is operating properly, and the problem
is in the ignition coil area.
 If the voltage reading is 100 volts or more
only with the MPEM disconnected from the
ignition coil, then the problem is in the
ignition coil area.
 If the voltage reading is less than 100 volts,
then the MPEM is defective and must be
replaced.
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5. Trigger Coil Output Test
 The last step in the systematic
troubleshooting procedures is testing the
output of the trigger coil.
 The output of the Trigger coil is .2 volts or
higher at engine cranking speeds
 In order to test trigger coil output a 6-pin
break-out harness is needed
 The 6-pin break-out harness is connected in
series with the magneto Deutsch connector
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6-pin break-out harness
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Magneto Deutsch connector
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6-pin break out harness
Magneto Deutsch connector
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Trigger Coil Output Test (cont’d)
 Proper meter connection to the trigger coil is
imperative (see next slide).
 The output of the Trigger coil should be .7
volts or higher at engine cranking speeds.
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Sea Doo 6-pin break out harness
DVA Meter Leads
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While cranking the engine,
the meter reading should .7
volts or higher.
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Trigger Coil Output Test (cont’d)
 If the peak voltage is lower than .7 volts,
reverse the meter leads and recheck the peak
voltage.
 If the peak voltage is still lower than
specifications, disconnect the trigger coils
leads and test again.
 If the peak voltage is still lower than
specification, reverse the meter leads again.
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Trigger Coil Output Test (cont’d)
 If the voltage reading is between .7 volts, or
higher then the trigger coil is operating
properly.
 If the voltage reading is .7 volts or higher
only with the trigger coil disconnected, then
the problem is in the MPEM.
 If the voltage reading is less than .7 volts,
then the trigger coil is defective.
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