The Engine Control Module in the Toyota 4Runner is a component that manages the engine by taking in information from various sensors to keep combustion within safe and efficient limits. The electrical system of the Toyota 4Runner is configured such that the Engine Control Module receives readings for oxygen, throttle, mass air flow, and coolant temperature. The Engine Control Module will adjust the amount of fuel, air, and timing for the ignition while maintaining the proper air-fuel mixture and idle speed to prevent damage to expensive components. By keeping programmed instructions for optimal running conditions, the Engine Control Module can quickly correct the imbalances that its sensors detect. Some units use a PROM chip that holds these instructions. When that chip is replaceable, the function can often be restored by putting a new PROM in rather than a new Engine Control Module. Options for replacement may be brand new or remanufactured, which will fit factory connectors so that it does not require any custom modifications for the Toyota 4Runner. A functional Engine Control Module helps any Toyota 4Runner run smoothly and reliably.
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