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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 216 (Engine Control System (DTC/Circuit Diagnosis) (CUMMINS 5.0L) (4 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0691-00: Cooling Fan >> DTC Description >> Notes

DTC Description: Notes

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.

The fan control circuit is a device used by the engine to control the fan operation. When the Engine Control Module (ECM) energizes the fan control circuit, the engine fan is engaged. The fan control circuit utilizes a Pulse Width Modulated (PWM) signal. A PWM signal is a pulsed voltage signal between 0V and system voltage. The frequency of the pulsed voltage signal is dependent on the application requirement.

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