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24 690 31 Rev. D
KohlerEngines.com
Propane EFI System
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
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.
Code 0032
Component: Oxygen Sensor Heater
Fault:
O2S Heater Circuit High Voltage
Condition:
System voltage too high, shorted
connection or faulty sensor.
Conclusion: Oxygen Sensor Related
● Sensor connector or wiring problem.
● Sensor damaged.
● Pin circuit wiring or connectors at Black
7.
ECU Related
● ECU-to-harness connection problem.
Code 0107
Component: Manifold Absolute Pressure (MAP or
TMAP) Sensor
Fault:
MAP or TMAP Circuit Low Voltage or
Open
Condition:
Intake manifold leak, open connection or
faulty sensor.
Conclusion: MAP or TMAP Sensor Related
● Sensor malfunction.
● Vacuum leaks from loose manifold or
sensor.
Wire Harness Related
● Poor grounding or open circuit.
● Wire harness and connectors loose,
damaged or corroded.
● Pin circuit wiring or connectors at Black
10, 11 and 16.
Bad TPS Learn.
