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In a 2001 Nissan Frontier truck, the ECM relay can be found inside the fuse panel underneath the dashboard on the driver's side near the gas pedal. This relay is important because it manages the engine control module, which is responsible for regulating various components of the engine such as air, fuel, and spark timing. When the ECM is malfunctioning, you may experience rough running of your vehicle. If the ECM completely fails, your car will not start. In such a situation, it is crucial to inspect the relay to ensure it is not damaged and is working properly.
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The ECM relay for the 2001 Nissan Frontier can be found beneath the dashboard on the right side next to the accelerator pedal.