Kohler Command PRO EFI ECV980 [77/172] Efi system
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Kohler Command PRO EFI ECV980 [77/172] Efi system

Kohler Command PRO EFI ECV940 [77/172] Efi system
77
EFI SYSTEM
62 690 05 Rev. F KohlerEngines.com
Fault Code Connection or Failure Description
0230 Fuel Pump Module Circuit Low Voltage or Open
0232 Fuel Pump Module Circuit High Voltage
0336 Crankshaft Position Sensor Noisy Signal
0337 Crankshaft Position Sensor No Signal
0351 Cylinder 1 Ignition Coil Malfunction
0352 Cylinder 2 Ignition Coil Malfunction
0562 System Voltage Low
0563 System Voltage High
1693 Tach Output (ECU) Low
1694 Tach Output (ECU) High
61 End of Code Transmission
ECU continuously monitors engine operation against
preset performance limits. If operation is outside limits,
ECU activates MIL, if equipped, and stores a diagnostic
code in its fault memory. If component or system
returns to proper function, ECU will turn off MIL. If MIL
stays illuminated, it warns customer a fault is currently
happening, and dealer service is required. Upon receipt,
dealer technician can access fault code(s) to help
determine what portion of system is malfunctioning.
Codes are accessed through key switch and displayed
as blinks or fl ashes of MIL. Access codes as follows:
1. Check that battery voltage is above 11 volts.
2. Start with key switch OFF.
3. Turn key switch to ON and OFF, then ON and OFF,
then ON, leaving it on in third sequence. Do not start
engine. Time between sequences must be less than
2.5 seconds.
4. MIL will blink a series of times. Number of times MIL
blinks represents a number in blink code.
5. A sequence of four digits make up a fault code.
There is a one (1) second pause between blinks of a
fault code. There is a three (3) second pause
between separate fault codes. After fault code(s) are
blinked a two digit 61 is blinked to indicate program
has completed.
a. It’s a good idea to write down codes as they
appear, as they may not be in numerical
sequence.
b. Code 61 will always be last code displayed,
indicating end of code transmission. If code 61
appears immediately, no other fault codes are
present.
After problem has been corrected, fault codes may
be cleared by following ECU Reset and TPS Learn
Procedures.
Diagnostic Fault Code Summary lists fault codes, and
what they correspond to. Diagnostic Code Summary
is a list of individual codes with an explanation of what
triggers them, what symptoms might be expected, and
probable causes.
A MIL may not be provided with engine. If equipment
manufacturer has not added a MIL to equipment, one
can be added easily for quick diagnostics. Main engine
to vehicle connection will have a tan wire which is
ground for MIL. 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. Attach
+12 volts to positive terminal of bulb and attach ground
terminal of bulb to tan wire.
Diagnostic Code Summary
Code 0031
NOTE: Codes 0031 and 0032 may have been
mistakenly activated by turning key ON with
oxygen sensor disconnected. If either code
status is historic, that code may have set during
assembly or a previous repair and may not be
related to current event. Clear codes and retest
to confi rm. If code status is current, refer to
Oxygen Sensor (O2) earlier in this section, to
test and troubleshoot.
Component: Oxygen Sensor Heater
Fault: O2S Heater Circuit Low Voltage
Condition: System voltage too low, open connection
or faulty sensor.
Conclusion: Engine Wiring Harness Related
● Pin circuit wiring or connectors.
ECU black pin 7 or broken wire.
Oxygen Sensor Related
● Sensor connector or wiring problem.
Poor system ground from ECU to engine
or battery to engine.

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