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Kohler Command PRO ECV630 Service Manual page 45

Vertical crankshaft
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Code 0351
Component: Ignition Coil
Fault:
Cylinder 1 Ignition Coil Malfunction
Condition:
Broken wire in harness (may not be
visible), shorted connection or faulty
sensor.
Conclusion: Engine Wiring Harness Related
● Connection to ignition or fuse.
● Pin circuit wiring or connectors.
● ECU pin Black 1.
● ECU-to-harness connection problem.
Ignition System Related
● Incorrect spark plug(s) used.
● Poor connection to spark plug.
Code 0352
Component: Ignition Coil
Fault:
Cylinder 2 Ignition Coil Malfunction
Condition:
Broken wire in harness (may not be
visible), shorted connection or faulty
sensor.
Conclusion: Engine Wiring Harness Related
● Connection to ignition or fuse.
● Pin circuit wiring or connectors.
ECU pin Grey 10.
● ECU-to-harness connection problem.
Ignition System Related
● Incorrect spark plug(s) used.
● Poor connection to spark plug.
Code 0562
Component: System Voltage
Fault:
System Voltage Low
Condition:
Faulty voltage regulator, bad fuse or
shorted connection.
Conclusion: Corroded Connections
Bad Stator
Bad Battery
● Low output charging system.
● Poor magnet in flywheel.
● Bad or missing fuse.
Code 0563
Component: System Voltage
Fault:
System Voltage High
Condition:
Faulty voltage regulator or shorted
connection.
Conclusion: Faulty Rectifier-Regulator
Bad Stator.
Bad Battery.
Code 61
Component: End of Code Transmission
24 690 02 Rev. D
Troubleshooting Flow Chart
Following flow chart provides an alternative method
of troubleshooting EFI system. Chart will enable you
to review entire system in about 10-15 minutes. Using
chart, accompanying diagnostic aids (listed chart), and
any signaled fault codes, you should be able to quickly
locate any problems within system.
Flow Chart Diagnostic Aids
Diagnostic Aid #1 SYSTEM POWER
(MIL does not illuminate when key is turned ON)
NOTE: MIL is installed by vehicle OEM. Twelve volt
supply to bulb will be part of vehicle wire
harness. Kohler key switch model will have MIL
on engine with 12V supply to bulb.
Conclusion
● Battery
● Main system fuse
● MIL light bulb burned out
● MIL electrical circuit problem
Pin circuits Grey 3.
● Ignition switch
● Permanent ECU power circuit problem
Pin circuit Black 18.
● Switched ECU power circuit problem
Pin circuit Black 15.
● ECU grounds
● ECU
Diagnostic Aid #2 FAULT CODES
Refer to Diagnostic Fault Code Summary.
Diagnostic Aid #3 RUN/ON
(MIL remains ON while engine is running)*
Condition
NOTE: Either incandescent or LED type bulbs can be
used for MIL as long as they do not draw more
than 0.1 amps. Bulb needs to be rated at 1.4
Watts or less, or needs to have a total resistance
of 140 Ω or more. LEDs typically draw less than
0.03 amps.
All current fault codes will turn on MIL when engine is
running.
Diagnostic Aid #4 CRANKSHAFT POSITION SENSOR
(MIL does not turn off during cranking)
Condition
● Crankshaft position sensor
● Crankshaft position sensor circuit problem, pin circuits
Black 4 and Black 13.
● Crankshaft position sensor/toothed wheel air gap
● Toothed wheel
● Flywheel key sheared
● ECU
Diagnostic Aid #5 FUEL PUMP
(fuel pump not turning on)
Condition
● Main fuse
● Fuel pump circuit problem, pin circuits Black 9 and
Grey 17.
● Fuel pump module
KohlerEngines.com
EFI SYSTEM-ECV
45

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