Hyundai Tucson: Engine Mechanical System

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Electrical System / 48V Battery System / Engine Mechanical System


  1. Pulley
  2. Stator assembly
  3. Rotor assembly
  4. Brush holder assembly
  5. Front bracket assembly
  6. Rear bracket assembly
  7. Inverter assembly


  1. Turn the ignition switch OFF and disconnect the battery (-) terminal.
  2. Disconnect the mild hybrid starter generator (MHSG) cables (A)

Tightening torque : 18.6 - 24.5 N.m (1.9 - 2.5 kgf.m, 13.7 - 18.1 lb-ft)

  1. Disconnect the mild hybrid starter generator (MHSG) connector (A).

  1. Disconnect the extension connector (A) and then remove the turbo charger coolant pipe mounting bolts (B).

Tightening torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

  1. Separate the fastener (A) from the mild hybrid starter generator (MHSG).

  1. Disconnect the turbo charger coolant hose (A) and reservoir tank coolant hose (B).

  1. Remove the drive belt tensioner.

(Refer to Engine Mechanical System - "Drive Belt Tensioner")

  1. Remove the mild hybrid starter generator (MHSG) mounting bolt (A).

Tightening torque : 49.0 - 63.7 N.m (5.0 - 6.5 kgf.m, 36.2 - 47.0 Ib-ft)

  1. Remove the mild hybrid starter generator (MHSG) (A).



Install in the reverse order of removal.


     Charging System

     Vehicle parasitic current inspection

    Inspection Using the Ammeter Turn the all electric devices OFF, and then turn the ignition switch OFF. Close all doors except the engine hood, and then lock all doors. (1) Disconnect the hood switch connector. (2) Close the trunk lid.

     CMF Battery

    Description The CMF (Closed Maintenance Free) battery is, as the name implies, totally maintenance free and has no removable battery cell caps. The CMF (Closed Maintenance Free) battery does not require water replenishment for the repair.


     Wiring Precautions

    SRS wiring can be identified by special yellow outer covering Observe the instructions described in this section. Never attempt to modify, splice, or repair SRS wiring. If there is an open or damage in SRS wiring, replace the harness.

     Power Relay (Type A)

     Component Location Engine room junction block ICU Junction block Inspection Power Relay (Type A) There should be continuity between the No.30 and No.87 terminals when power and ground are connected to the No.85 and No.86