: A break in the wiring harness or a corroded connector between the ECU and the turbo actuator.

Before replacing expensive components, follow this systematic diagnostic approach. Always wear appropriate PPE, disconnect the battery when checking resistance, and consult your specific Doosan machine's service manual for pinout details.

The ECT sensor uses a thermistor to alter electrical resistance based on coolant temperature. Constant heat cycling can cause internal components to crack or degrade, resulting in an infinite internal resistance reading that the ECU interprets as an open circuit. Drastic Coolant Loss

Compare your reading against the factory specification outlined in your model's specific Doosan service manual (typically between

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