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Once repairs are completed, the technician clears or “resets” the DTCs, turning off the CEL. While the DTC does not tell an auto repair technician what to replace, it can lead them in the right direction to make a repair. If the check engine light comes on, one or more of some 10,000 DTCs might be stored in ECM memory.
RESET IAC USING NISSAN DATA SCAN 2 CODE
At the same time, the ECM stores a diagnostic trouble code (DTC) in memory. If the ECM detects a problem, such as sensor data out of sync or air flow readings that don’t “make sense,” it will turn on the check engine light, also known as the malfunction indicator lamp or service engine soon light (CEL, MIL, or SES). Using this data, it can fine-tune actuators to deliver more power when needed and reduced emissions whenever possible. Using dozens of sensors, such as those that measure engine coolant temperature or transmission output shaft speed, the ECM monitors engine and transmission function. Physically, the ECM and TCM may be located anywhere in the vehicle, such as in the trunk, under the dash, or under the hood. The two main computers we usually worry about are the engine or powertrain control module (ECM or PCM) and the transmission control module (TCM). Fast-forward 130 years: Dozens of computers control everything from wiper blades and power windows to the internal combustion engine and transmission. When the automobile was first invented, it was a purely mechanical creation.