5524 690 01 Rev. S KohlerEngines.com
EFI SYSTEM-ELECTRONIC THROTTLE BODY (ETB) ECH
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.
ECU circuit will fl ow small amount of current. This may dimly illuminate LED type bulb. On is bright. Resistor can be
added in series if LED type bulb is used to eliminate glow.
Diagnostic Code Summary
Fault Code MIL Blinks SPN FMI
Code P0031 10/11/15/10 3056 5
NOTE: Codes P0031 and P0032 may have been
mistakenly activated by turning key ON with
oxygen sensor disconnected. If either code
status is inactive, 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 active, 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.
Fault Code MIL Blinks SPN FMI
Code P0032 10/11/15/10 3056 6
NOTE: Codes P0031 and P0032 may have been
mistakenly activated by turning key ON with
oxygen sensor disconnected. If either code
status is inactive, 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 active, refer to
Oxygen Sensor (O2) earlier in this section, to
test and troubleshoot.
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.
Fault Code MIL Blinks SPN FMI
Code P0107 10/10/6/6 102 4
Component: Manifold Absolute Pressure (TMAP)
Fault: MAP Circuit Low Voltage or Open
Condition: Intake manifold leak, open connection or
faulty sensor.
Conclusion: 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.
Fault Code MIL Blinks SPN FMI
Code P0108 10/10/6/6 102 3
Component: Manifold Absolute Pressure (TMAP)
Fault: MAP Circuit High Voltage
Condition: Intake manifold leak, shorted connection
or faulty sensor.
Conclusion: TMAP Sensor Related
● Sensor malfunction.
● Vacuum leaks from loose manifold or
sensor.
Wire Harness Related
● Poor grounding.
● Pin circuit wiring or connectors at Black
11.
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