Operation
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6.4.1 ECU OVERRIDE
NOTE: Depending upon system design, the ECU may be powered or unpowered when the
module is in STOP mode. ECU override is only applicable if the ECU is unpowered when in
STOP mode.
When the ECU is powered down (as is normal when in STOP mode), it is not possible to read the
diagnostic trouble codes or instrumentation. Additionally, it is not possible to use the engine
manufacturers’ configuration tools.
As the ECU is usually unpowered when the engine is not running, it must be turned on manually as
follows:
• Select STOP mode on the DSE controller.
• Press and hold the START button to power the ECU. As the controller is in STOP mode,
the engine will not be started.
• Continue to hold the start button for as long as you need the ECU to be powered.
• The ECU will remain powered until a few seconds after the START button is released.
This is also useful if the engine manufacturer’s tools need to be connected to the engine, for instance
to configure the engine as the ECU needs to be powered up to perform this operation.
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