Okuzeka
Automotive vocabulary · Vehicle Electronics and ADAS

ECU

Meaning in automotive, with examples

/ˌiː siː ˈjuː/abbreviationCore term

In automotive, ECU means: Short for electronic control unit (or engine control unit): a small computer that reads sensors and controls actuators, for example injection timing in an engine. Modern cars have dozens of them.

In Turkish: elektronik kontrol ünitesi, motor kontrol ünitesi, beyin

How it is used

Technicians read, reset, flash (update the software in) and replace ECUs. Engineers talk about ECU software, calibration, inputs and outputs. Some units have their own names, such as ECM, TCM and BCM.

Example sentences

  1. After replacing the ECU, we had to program it with the vehicle's VIN.

  2. The engine ECU limits power when the coolant temperature gets too high.

Common collocations

  • flash the ECU
  • ECU software
  • replace the ECU
  • ECU update
  • sensorA component that measures something, such as temperature, pressure, speed or position, and sends it as an electrical signal to a control unit.
  • actuatorA component that turns an electrical command from a control unit into movement, for example a motor that opens the throttle, moves a valve or locks a door.
  • CAN busThe main in-vehicle network that lets control units share data over a pair of twisted wires (CAN High and CAN Low). CAN stands for Controller Area Network.
  • diagnostic trouble codeA standard code stored by a control unit when it detects a fault, such as P0300. The first letter shows the system: P for powertrain, B for body, C for chassis and U for network.
  • limp modeA protective mode in which a control unit limits engine power, speed or gear selection after detecting a serious fault, so the car can still be driven slowly to a workshop.

More terms: Vehicle Electronics and ADAS

Practise with graded reading

Reading at the right level is the fastest way to make new words stick. Pick free English books by level: