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Does Replacing the Car Body Control Module Require Matching?

1 Answers

WillowRose

07/29/25 9:18pm

Replacing the car body control module definitely requires matching. Introduction to the Control Module: The car engine control module (ECM) is one of the most important automotive electronics. Early ECMs required three printed circuit boards, composed of 12 LSIs and dozens of SSIs. Today, ECMs based on microcontrollers have been realized, requiring only a single printed circuit board. Functions of the Control Module: The engine control module can provide 5V or 12V voltage to various sensors or switches, achieved through feedback resistors connected to the internal regulated power supply of the engine control module. In some cases, ordinary voltmeters used in repair shops may give inaccurate readings due to their low impedance. Therefore, a digital multimeter with an input impedance of at least 10 MΩ is required to ensure accurate voltage readings.

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