2026-09-24

Oil Pump - Electric - Rear Drive Unit (4DU) (Remove and Replace)

Correction code 4001010032 0.54 NOTE: Unless otherwise explicitly stated in the procedure, the correction code and its associated FRT reflect all of the work required to perform this procedure, including the linked procedures. Do not stack correction codes unless explicitly told to do so. NOTE: See Flat Rate Times to learn more about FRTs and how they are created. NOTE: See Personal Protection to make sure you are wearing proper PPE when performing the procedure below. NOTE: See Ergonomic Precautions for safe and healthy working practices.

  • 2026-09-18: Removed steps to connect/disconnect LV power; added steps to connect/disconnect power supply and oil pump switchbox to oil pump connector.

Torque Specifications

Table 1. Torque Specifications:
Description Torque Value Recommended Tools Reuse/Replace Notes
The fill plug on the oil plug
15 Nm (11.1 lbs-ft)
  • 8 mm socket
  • Flex head ratchet/flex head torque wrench
 Reuse
The drain plug on the oil plug
15 Nm (11.1 lbs-ft)
  • 8 mm socket
  • Flex head ratchet/flex head torque wrench
 Reuse
bolts (x2) that attach the rear drive unit oil pump to the rear drive unit
5 Nm (3.7 lbs-ft) + 20 deg
  • EPL10 Socket
  • Torque wrench with angle measurement

Remove

  1. Move the vehicle to a 2 post lift. See Raise Vehicle - 2-Post Lift.
  2. Remove mid aero shield. See Aero Shield - Rear (Remove and Replace)
  3. Position an oil drain collector under the rear drive unit oil pump.
  4. Remove the fill plug from the oil pump.
    Tip
    Use of the following tool(s) is recommended:
    • 8 mm socket
    • Flex head ratchet/flex head torque wrench
  5. Remove the drain plug from the oil pump.
    Note
    Inspect the O-ring for damage, and if the O-ring is damaged, replace the O-ring.
    Tip
    Use of the following tool(s) is recommended:
    • 8 mm socket
    • Flex head ratchet/flex head torque wrench
  6. Pull the red tab, and then pull the red tab again to disconnect the rear subframe harness from the rear drive unit oil pump connector.
  7. Connect the power supply and oil pump switchbox to the oil pump connector.
  8. Run the oil pump for 1 minute to fully drain remaining oil from the 4DU.
    Note
    Oil will shoot out at a wide angle, so adjust the drain container as needed. Do NOT run the pump dry for more than 10 seconds.
  9. Disconnect the power supply and oil pump switchbox from the oil pump connector.
  10. Install the drain plug from the oil pump.
    15 Nm (11.1 lbs-ft)
    Note
    Inspect the O-ring for damage, and if the O-ring is damaged, replace the O-ring.
    Tip
    Use of the following tool(s) is recommended:
    • 8 mm socket
    • Flex head ratchet/flex head torque wrench
  11. Release the hose clip from the resolver cover, rotate the clip 90° counterclockwise, then move the water hose upward to create space for removing the oil pump upper bolts.
  12. Remove the bolts (x2) that attach the rear drive unit oil pump to the rear drive unit.
    Tip
    Use of the following tool(s) is recommended:
    • EPL10 Socket
    • Torque wrench with angle measurement
  13. Use a plastic pry tool to separate the rear drive unit oil pump from the rear drive unit, remove the oil pump, and allow the fluid to drain.

Replace

  1. Apply a light coat of ATF-9 oil to the O-rings of the rear drive unit oil pump, and then wipe away any excess oil.
  2. Position the oil pump to the rear drive unit.
    Note
    Inspect the O-rings for damage; if damaged, replace the O-rings.
  3. Install the bolts (x2) that attach the rear drive unit oil pump to the rear drive unit.
    5 Nm (3.7 lbs-ft) + 20 deg
    Tip
    Use of the following tool(s) is recommended:
    • EPL10 Socket
    • Torque wrench with angle measurement
  4. Rotate the clip 90° clockwise to secure it onto the resolver cover.
  5. Fill a 3000mL measuring container with 2.5L/2500mL of KAF1 gearbox fluid.
    Note
    The rear drive unit requires 2.3L/2300mL of fluid, however the excess fluid will prevent underfill and air entrapment.
  6. Connect the 12V power supply to the oil pump.
  7. Install the hoses onto the fluid transfer pump.
  8. Place the measuring container and the fluid transfer pump into the oil drain basket.
  9. Insert the output hose of the fluid transfer pump into the fill hole of the rear drive unit until fully seated, then pull back 5 mm.
  10. Fully submerge the input hose of the fluid transfer pump into the measuring container.
  11. Pump 2.3L/2300mL of KAF1 gearbox fluid into the rear drive unit.
    Note
    Recommend an assistant to perform this step; the assistant will run oil pump switchbox using XP-10 Jump Pack and have the fill plug ready for installation.
    Note
    Make sure the input hose end remains submerged, so that air is not pumped into the gearbox.
    Note
    When properly filled, there should be 200mL or less of gearbox fluid left in the measuring container.
  12. Remove the output hose from the rear drive unit.
  13. Put on face shielding PPE.
  14. Disconnect the 12V power supply tool from the oil pump.
  15. Install the fill plug from the oil pump.
    15 Nm (11.1 lbs-ft)
    Note
    Inspect the O-ring for damage, and if the O-ring is damaged, replace the O-ring.
    Tip
    Use of the following tool(s) is recommended:
    • 8 mm socket
    • Flex head ratchet/flex head torque wrench
  16. Connect the oil pump connector.
  17. Spray the working area of the rear drive unit with brake cleaner, and then wipe off residual fluid with a clean shop towel.
  18. Remove the oil drain collector out from under the rear drive unit.
  19. Locally connect a laptop with Toolbox 3 to the vehicle. See Toolbox (Connect and Disconnect).
  20. Install mid aero shield. See Aero Shield - Rear (Remove and Replace)
  21. Reinstall vehicle software. See Software Reinstall - Touchscreen.
  22. On the laptop, select Actions tab, and search for "Oil Pump Low Pressure Test - Rear Drive Unit". Select TEST-SELF_DIR_X_OIL-PUMP-PRESSUREvia Toolbox:(link), click Run, and allow the routine to complete.
  23. Disconnect the laptop.
  24. Exit Service Mode. See Service Mode.
  25. Raise LH front window and close LH front door.
  26. Remove the vehicle from the 2 post lift. See Raise Vehicle - 2-Post Lift.