Safety
Service and Repair Manual
Prevent property damage
2.9 Prevent property damage
2.9.1 Safety instructions for engine control unit (ECU)
NOTICE
Improper installation or misuse of the engine leads to ECU damage.
Property damage due to non-compliant installation or operation.
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Ensure the connection to power supply before starting the engine.
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It is prohibited to disconnect the electrical power supply during operation.
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Ensure the connection of the ECU before starting the engine.
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Using a rapid charging device to start the engine is prohibited. Only jump start with separate
batteries is allowed.
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Electrical welding in the vicinity of the engine is forbidden, especially near the ECU.
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Switch off the electrical system before connecting or disconnecting the ECU. Apply to the
prescribed tightening torque to tighten the fixing screws of the interface plugs. The manufacturer
of the machinery has to provide an electrical disconnect.
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Reversing the polarity of supply voltage results in the ECU destruction.
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Apply to the prescribed torque to tighten the connections to the injection system.
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Extreme engine compartment temperatures will damage the ECU. Please refer to the technical
data sheet for temperatures values.
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Use suitable test cables to ensure the measures at plug connectors.
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Connecting the sensors or actuators individually to or between external voltage sources for
testing purposes is prohibited. Risk of destruction or malfunction of the engine. Connect the
sensors or actuators to the ECU.
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Mount and fix the mating connectors to protect the ECU against dust and moisture. When the
mating connectors are dismounted, ensure protection of the ECU against dust and moisture by
protective covers.
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Using mobile phones and wireless devices in the vicinity of the engine is prohibited. Risk of
malfunction of the ECU and the engine.
2.9.2 Alarm conditions
CAUTION
Property damage and/or injuries due to neglect of fault codes.
Neglecting the fault code may lead to engine failure (for example, overspeed) and could result in
minor or moderate injuries (for example, ejection of parts) by hazards from related actions.
The engine is equipped with an engine control unit, which monitors the engine and itself (self-diag-
nosis). After assessment of an identified fault, the following actions are automatically initiated:
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Issue of a fault message with a fault code.
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In combination with the machinery diagnosis system, the fault code is shown via a display.
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Switch over to appropriate backup/emergency functions for additional, restricted operation of
the engine (for example, constant limp-home speed).
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Make sure that the faults are immediately repaired.
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© 2021 by Kohler Co. All rights reserved.
KD83V16 33525088901_2_1 EN_US
2021-07
