Technician Handbook ! 673 Electronic & Computer Controlled Systems Initialization ECUs may need to be initialized when: • A new ECU is installed • Key components related to the ECU’s operation have been replaced • Loss of power erases critical memory settings. Initializing an ECU simply means preparing it for operation. If an ECU is not initialized when required: • The system may be inoperable or operate incorrectly • Some system features may be disabled. Why Initialize? When an ECU is installed, it becomes part of a system of interconnected components. Many ECUs are designed to work in systems with optional components in sometimes varying configurations.
Before the ECU can begin operation, it must learn the configuration of the system it’s connected to, and sometimes obtain data from other components. This takes place during initialization. When initialization is completed, the ECU has acquired the information it needs to begin performing its function. In quite a few vehicle systems, ECUs control motors , such as power window motors and power back door motors. These systems require initialization in particular so the ECU can synchronize itself with the motor to control the opening and closing function properly. In systems with jam protection , this feature may be inoperable until the ECU has been initialized.
NOTE Before determining an ECU is faulty, first verify that it doesn't just need to be initialized. Technical Training 21