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Home >> Hyundai >> 2014 >> Sonata Hybrid >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (HEV) >> Engine Control Module (ECM) >> Repair Procedures >> Removal
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Repair Procedures: Removal

NOTE: When replacing the ECM, the vehicle equipped with the smart key must be performed the procedure as below.

[In the case of installing used ECM] 

  1. Perform "Neutral mode" procedure with GDS. (Refer to TEACHING MODE PROCEDURE DESCRIPTION (STEP BY STEP) )
  2. Turn the ignition ON and OFF position after completing "ECM neutral mode". Then the ECM key register process is completed automatically.

[In the case of installing new ECM] 

Turn the ignition ON and OFF position after completing "ECM neutral mode".

Then the ECM key register process is completed automatically.

NOTE: This ECM is a PCM type that includes a Transaxle Control Module (TCM).

Threfore TCM must be performed TCM learning procedure after replacing or re-installing a TCM. (Refer to "AUTOMATIC TRANSAXLE CONTROL SYSTEM ")

  1. Shut off the High Voltage circuit. Refer to "HIGH VOLTAGE SHUTOFF PROCEDURE "
  2. Turn ignition switch OFF and disconnect the negative (-) battery cable.
  3. Disconnect the ECM Connector (A).
    Fig 1: Identifying ECM Connector
    G00546579Courtesy of HYUNDAI MOTOR CO.
  4. Remove the air cleaner assembly (Refer to "INTAKE AND EXHAUST SYSTEM ").
  5. Release the reservoir (A) after removing the bolts (B).
    Fig 2: Identifying Reservoir & Bolts
    G00546580Courtesy of HYUNDAI MOTOR CO.
  6. Disconnect the power cable (A) from the HPCU.
    1. Pull the lever (B) in the direction of the arrow with the hook (C) pressed.
    2. Press the lever (D), and then pull the power cable connector.
    Fig 3: Identifying HPCU Power Cable
    G00546581Courtesy of HYUNDAI MOTOR CO.
    Fig 4: Identifying Power Cable Connector
    G00546582Courtesy of HYUNDAI MOTOR CO.
  7. Remove the nut of the battery plus cable (A) in the engine room relay box.
  8. Disconnect the fixing clips (B) of the battery plus cable protector from the bracket.
    Fig 5: Identifying Battery Plus Cable Fixing Clips & Nut
    G00546583Courtesy of HYUNDAI MOTOR CO.
  9. Pull the battery plus cable (A) toward the engine room to make space for the bracket bolt removal.
    Fig 6: Removing Battery Plus Cable
    G00546584Courtesy of HYUNDAI MOTOR CO.
  10. Remove the ECM bracket assembly (A) after removing the installation bolt (B) and nut (C).
    Fig 7: Identifying ECM & Fasteners
    G00546585Courtesy of HYUNDAI MOTOR CO.
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