LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hyundai >> 2021 >> Sonata Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - 1.6L (Except HEV) >> Engine Control Module (ECM) >> Repair Procedures >> Removal
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Repair Procedures: Removal

NOTE:
  • If you replace the PCM, you must perform oil pressure characteristics back up & input (TCU Replacement). (Refer to Automatic Transaxle System - "INSTALLATION ")
CAUTION:
  • When replacing the ECM, the vehicle equipped with the immobilizer must be performed procedure as below.

[In the case of installing used ECM] 

  1. Perform "ECM Neutral mode" procedure with diagnostic tool.

    (Refer to Body Electrical System - "IMMOBILIZER SYSTEM ")

  2. After finishing "ECM Neutral mode", perform "Key teaching" procedure with diagnostic tool.

    (Refer to Body Electrical System - "IMMOBILIZER SYSTEM ")

[In the case of installing new ECM] 

(Refer to Body Electrical System - "IMMOBILIZER SYSTEM ")

CAUTION:
  • When replacing the ECM, the vehicle equipped with the smart key system (Button start) must be performed procedure as below.

[In the case of installing used ECM] 

  1. Perform "ECM Neutral mode" procedure with diagnostic tool.

    (Refer to Body Electrical System - "SMART KEY ")

  2. After finishing "ECM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position.

    Then the ECM learns the smart key information automatically.

[In the case of installing new ECM] 

  1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  2. Disconnect the ECM Connector (A).
    G14625657Courtesy of HYUNDAI MOTOR AMERICA
  3. Release the fixing hook (A), and then removing the ECM (B).
    G14625658Courtesy of HYUNDAI MOTOR AMERICA
  4. Remove the ECM (A) from the bracket after loosening mounting bolt (B).

    ECM Mounting bolt: 

    6.9 - 8.3 N.m (0.7 - 0.85 kgf.m, 5.1 - 6.1 lb.ft)

    G14625659Courtesy of HYUNDAI MOTOR AMERICA