2025-04-04

Hose - Inverter to Heat Exchanger - Rear Drive Unit (3DU) (Remove and Replace)

Correction code 18300192 1.92 NOTE: Unless otherwise explicitly stated in the procedure, the above correction code and 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. To provide feedback on FRT values, email LaborTimeFeedback@tesla.com. NOTE: See Personal Protection to make sure wearing proper PPE when performing the below procedure.

  • 2025-04-04: Cleaned up procedure for clarity, updated ODIN routines.
  • 2023-06-09: Added shear plate small bolts torque figure for Structural Pack vehicles.
Special tools required for this procedure:

1781872-02-A M3/Y REAR AXLE DROP ASSIST KIT

Torque Specifications

Table 1. Torque Specifications: Subframe Assembly - Rear (Remove and Install)
Description Torque Value Recommended Tools Reuse/Replace Notes
Bolts that attach the LH rear brake caliper bracket to the knuckle
83 Nm (61.2 lbs-ft)
  • External Torx E18
Replace
Bolts that attach the LH rear damper at the top mount
41 Nm (30.2 lbs-ft)
  • 15 mm socket
  • 3 in extension
Reuse
Nut that attaches the rear drive unit ground strap to the body
10 Nm (7.4 lbs-ft)
  • 10 mm 12-point deep socket
Reuse
Nuts that attach the HV battery to rear drive unit harness bracket to the HV battery
10 Nm (7.4 lbs-ft)
  • 10 mm socket
  • 4 in extension
Reuse
Small bolts that attach the LH shear plate to the HV battery (non-Structural Pack vehcles)
35 Nm (25.8 lbs-ft)
  • 13 mm socket
  • 3 in extension
Reuse
Small bolts that attach the LH shear plate to the HV battery (Structural Pack vehicles)
62 Nm (45.7 lbs-ft)
  • 13 mm socket
  • 3 in extension
Large bolt that attaches the LH shear plate and rear subframe to the body
130 Nm (95.9 lbs-ft)
  • 21 mm socket
  • 6 in extension
Replace
Bolts that attach the rear subframe to the body
165 Nm (121.7 lbs-ft)
  • 21 mm socket
  • 6 in extension
Replace

Remove

  1. Prepare the vehicle for lifting. See Raise Vehicle - 2 Post Lift.
  2. Perform the following routine using Service Mode or Toolbox (see 0005 - Service Modes): PROC_VCFRONT_X_START-THERMAL-FILL-DRAINvia Toolbox: (link)via Service Mode:
    • Thermal ➜ Actions ➜ Start Thermal Fill/Drain
    • Thermal ➜ Coolant System ➜ Start Coolant Fill/Drain
    • Thermal ➜ Refrigerant System ➜ Start Refrigerant Fill/Drain
    via Service Mode Plus: Drive Inverter ➜ Front Drive Inverter Replacement ➜ Start Fluid Fill/Drain
  3. Disconnect 12V/LV power. See 12V/LV Power (Disconnect and Connect).
  4. Perform the vehicle HV disablement procedure. See Vehicle HV Disablement Procedure.
  5. Remove the LH and RH rear wheels. See Wheel Assembly (Remove and Install).
  6. Remove the LH and RH suspension cover. See Cover - Rear Suspension - LH (Remove and Replace).
  7. Remove the mid aero shield panel. See Panel - Aero Shield - Mid (Remove and Replace).
  8. Remove the rear fascia diffuser. See Diffuser - Rear Fascia (Remove and Replace).
  9. Disconnect the RH side 12V subframe harness connector.
  10. Remove the RH side 12V subframe harness clip from the body.
  11. Disconnect the electrical harness from the LH 12V subframe connector.
  12. Release the clip that attaches the LH subframe electrical harness to the body.
  13. Remove the nut that attaches the rear drive unit ground strap to the body.
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 10 mm 12-point deep socket
  14. Remove the rear stabilizer bar. See Stabilizer Bar - Rear (Remove and Replace).
  15. Release the clips (x2) that attach the coolant hoses to the LH shear plate.
  16. Release the LH side hose clips from the rear battery skid plate.
    Informational PurposesAn informational icon, calling your attention
    Note
    Number of clips may vary depending on vehicle built date.
  17. Release the RH side hose clips from the rear battery skid plate.
  18. Release the clips (x2) that attach the coolant hoses to RH shear plate.
  19. Position a coolant drain container underneath the LH RDU area.
  20. Disconnect the RDU inverter inlet hose from the fluid coupling.
    Informational PurposesAn informational icon, calling your attention
    Note
    Plug ends as needed.
  21. Remove the coolant drain container from underneath the vehicle.
  22. Release the RDU inverter inlet tube from the RDU HV cable harness.
    Informational PurposesAn informational icon, calling your attention
    Note
    1x fir tree clip
  23. Remove the bolt that attaches the RDU HV cable bracket to the RDU.
  24. Disconnect the RDU HV connector from the RDU.
  25. Perform the RDU diode test.
    Informational PurposesAn informational icon, calling your attention
    Note
    Make sure that the RDU HV cable is disconnected from the HV battery.

    Use a multimeter in diode mode, with the positive DMM probe to B- of the inverter and the negative probe to B+.

    Pin #1 on HV cables is B- and Pin #2 is B+.

    MOSFET acceptable diode reading:1.0 - 2.0 V. IGBT acceptable diode reading 0.45 - 2 V (if you get OL or > 2V for a reading you most likely have the probes installed the wrong way around)

  26. Release the RDU logic connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    Do not allow coolant to enter the connector. Move connector aside as needed.
  27. Release the RDU logic connector clip.
    Informational PurposesAn informational icon, calling your attention
    Note
    1x clip
  28. Place subframe lifting tool into position underneath the rear subframe.
  29. Raise subframe lifting tool to support the rear subframe
    Informational PurposesAn informational icon, calling your attention
    Note
    3x straps. Attach metal hooks at the end of the straps to the rings on the subframe lifting tool and pull straps until they are secure. Lower the vehicle as necessary, Assistance is recommended.
  30. Remove the smaller bolts (x2) that attach the LH shear plate.
  31. Remove the large bolt that attaches the LH shear plate and subframe to the body, and then remove the shear plate.
  32. Install the LH front extension bolt to secure the subframe to the body.
    Informational PurposesAn informational icon, calling your attention
    Note
    During lowering and raising the sub frame, the adjusting nut and the other three nuts should be kept at the same height.
  33. Repeat steps 30to 32 on the RH side of the vehicle.
  34. Remove the LH rear bolt that attaches the subframe to the body.
  35. Install the LH rear extension bolt t0 secure the subframe to the body.
    Informational PurposesAn informational icon, calling your attention
    Note
    During lowering and raising the sub frame, the adjusting nut and the other three nuts should be kept at the same height as possible
  36. Remove the RH rear bolt that attaches the subframe to the body.
  37. Install the RH rear extension bolt to secure the subframe to the body.
    Informational PurposesAn informational icon, calling your attention
    Note
    During lowering and raising the sub frame, the adjusting nut and the other three nuts should be kept at the same height.
  38. Partially lower the subframe and rear drive unit assembly.
    Informational PurposesAn informational icon, calling your attention
    Note
    Use caution while lowering subframe to avoid damage to surrounding components. Lower the subframe approximately 13 cm.
  39. Release the clip that attaches the inverter to heat exchanger hose to the inverter and remove the hose from the inverter.
  40. Release the clips (x4) that attach the inverter coolant hose to the RDU.
  41. Release the RDU inverter coolant hose from the heat exchanger, and the remove the hose from the vehicle.

  1. Install the inverter to heat exchanger hose to the heat exchanger.
    Informational PurposesAn informational icon, calling your attention
    Note
    Perform a push-pull-push test to make sure that the hose is fully seated.
  2. Install the clips (x4) that attach the inverter to heat exchanger coolant hose to the RDU.
  3. Install the inverter to heat exchanger hose to the inverter.
    Informational PurposesAn informational icon, calling your attention
    Note
    Perform a push-pull-push test to make sure hose is fully seated.
  4. Raise drive unit and subframe into position.
  5. Remove the RH rear extension bolt.
  6. Install the RH rear bolt that attaches the rear subframe to the body hand tight.
    Informational PurposesAn informational icon, calling your attention
    Note
    Torque at a later step.
  7. Remove the LH rear extension bolt.
  8. Install the LH rear bolt that attaches the rear subframe to the body hand tight
    Informational PurposesAn informational icon, calling your attention
    Note
    Torque at a later step.
  9. Remove the LH front extension bolt .
  10. Install the large bolt and shear plate to the LH side of the rear subframe hand tight.
    Informational PurposesAn informational icon, calling your attention
    Note
    Torque at a later step
  11. Install the smaller bolts (x2) that attach the LH rear shear plate to the body hand tight.
    Informational PurposesAn informational icon, calling your attention
    Note
    Torque at a later step.
  12. Remove the RH front extension bolt.
  13. Install the large bolt and shear plate to the RH side of the rear subframe hand tight.
    Informational PurposesAn informational icon, calling your attention
    Note
    Torque at a later step.
  14. Install the smaller bolts (x2) that attach the RH shear plate hand tight.
    Informational PurposesAn informational icon, calling your attention
    Note
    Torque at a later step.
  15. Torque the smaller bolts that attach the LH and RH shear plates to the vehicle.
    Informational PurposesAn informational icon, calling your attention
    Note
    35 Nm for non-Structural Pack vehicles, 62 Nm for Structural Pack vehicles.
  16. Torque the larger bolts that attach the LH and RH rear shear plate to the body (torque 130 Nm).
    Informational PurposesAn informational icon, calling your attention
    Note
    1x bolt, 21mm, 130 Nm, Mark bolt after torque
  17. Torque the bolt that attaches the RH rear of the subframe to the body (torque 165 Nm).
  18. Torque the bolt that attaches the LH rear of the subframe to the body (torque 165 Nm).
  19. Install the clips that attach the coolant hoses to the RH shear plate.
  20. Install the clips that attach the coolant hoses to the LH shear plate.
  21. Lower the rear subframe lifting tool.
    Informational PurposesAn informational icon, calling your attention
    Note
    Make sure that the yellow safety straps are removed from the subframe.
  22. Remove the subframe lifting tool from underneath the vehicle.
  23. Attach the RDU logic connector clip.
  24. Connect the RDU logic connector.
    Informational PurposesAn informational icon, calling your attention
    Note
    Make sure that there is no spilled coolant inside the connector.
  25. Connect the RDU HV cable connector to the RDU.
  26. Install the bolt that attaches the RDU HV cable bracket to the RDU (torque 6 Nm).
  27. Remove the hose plugs, and then connect the coolant inlet hose to the rear drive unit.
    Informational PurposesAn informational icon, calling your attention
    Note
    Perform a push-pull-push test to make sure that hose is fully seated.
  28. Install the RDU inverter inlet hose clip onto the HV cable.
  29. Install the RH side hose clips to the rear battery skid plate.
  30. Install the LH side hose clips to the HV battery rear skid plate enclosure.
    Informational PurposesAn informational icon, calling your attention
    Note
    Number of clips may vary per vehicle build date.
  31. Install the rear stabilizer bar. See Stabilizer Bar - Rear (Remove and Replace).
  32. Install the nut that attaches the rear drive unit ground strap to the body.
    10 Nm (7.4 lbs-ft)
    Informational PurposesAn informational icon, calling your attention
    TIp
    Use of the following tool(s) is recommended:
    • 10 mm 12-point deep socket
    Informational PurposesAn informational icon, calling your attention
    Note
    Reinstall the washer if the vehicle had this washer during removal.
  33. Install LH side 12V subframe harness clip to body
    Informational PurposesAn informational icon, calling your attention
    Note
    1x clip
  34. Connect LH side 12V subframe harness connector
    Informational PurposesAn informational icon, calling your attention
    Note
    1x connector, Engage locking tab
  35. Install RH side 12V subframe harness clip to the body.
  36. Connect the RH side 12V subframe harness connector.
  37. Install the rear fascia diffuser. See Diffuser - Rear Fascia (Remove and Replace).
  38. Install the mid aero shield panel. See Panel - Aero Shield - Mid (Remove and Replace).
  39. Install the LH and RH rear suspension covers. See Cover - Rear Suspension - LH (Remove and Replace).
  40. Install the LH and RH rear wheels. See Wheel Assembly (Remove and Install).
  41. Remove the coolant bottle cap, and then fill the coolant bottle to the "MAX" line.
  42. Connect 12V power. See 12V/LV Power (Disconnect and Connect).
  43. Perform the following routine using Service Mode or Toolbox (see 0005 - Service Modes): PROC_VCFRONT_X_STOP-THERMAL-FILL-DRAINvia Toolbox: (link)via Service Mode:
    • Thermal ➜ Actions ➜ Stop Thermal Fill/Drain
    • Thermal ➜ Coolant System ➜ Stop Coolant Fill/Drain
    • Thermal ➜ Refrigerant System ➜ Stop Refrigerant Fill/Drain
    via Service Mode Plus:
    • Drive Inverter ➜ Front Drive Inverter Replacement ➜ Stop Fluid Fill/Drain
    • Drive Inverter ➜ Rear Drive Inverter Replacement ➜ Stop Fluid Fill/Drain
    • Drive Inverter ➜ Rear Left Drive Inverter Replacement ➜ Stop Fluid Fill/Drain
    • Drive Inverter ➜ Rear Right Drive Inverter Replacement ➜ Stop Fluid Fill/Drain
    • Drive Unit ➜ Front Drive Unit Replacement ➜ Stop Coolant Fill/Drain
    • Drive Unit ➜ Rear Drive Unit Replacement ➜ Stop Coolant Fill/Drain
  44. Perform the following routine using Service Mode or Toolbox (see 0005 - Service Modes): TEST_VCFRONT_X_THERMAL-COOLANT-AIR-PURGEvia Toolbox: (link)via Service Mode:
    • Thermal ➜ Actions ➜ Coolant Purge Stop or Coolant Purge Start
    • Thermal ➜ Coolant System ➜ Coolant Purge Start
    via Service Mode Plus:
    • Drive Inverter ➜ Front Drive Inverter Replacement ➜ Coolant Air Purge
    • Drive Inverter ➜ Rear Drive Inverter Replacement ➜ Coolant Air Purge
    • Drive Inverter ➜ Rear Left Drive Inverter Replacement ➜ Coolant Air Purge
    • Drive Inverter ➜ Rear Right Drive Inverter Replacement ➜ Coolant Air Purge
    • Drive Unit ➜ Front Drive Unit Replacement ➜ Coolant Air Purge
    • Drive Unit ➜ Rear Drive Unit Replacement ➜ Coolant Air Purge
  45. Inspect coolant level and top off as necessary.
  46. Perform the following routine using Service Mode or Toolbox (see 0005 - Service Modes): TEST-SELF_VCFRONT_X_THERMAL-PERFORMANCEvia Toolbox: (link)via Service Mode: Thermal ➜ Actions ➜ Test Thermal Performancevia Service Mode Plus:
    • Drive Inverter ➜ Front Drive Inverter Replacement ➜ Thermal System Test
    • Drive Inverter ➜ Rear Drive Inverter Replacement ➜ Thermal System Test
    • Drive Inverter ➜ Rear Left Drive Inverter Replacement ➜ Thermal System Test
    • Drive Inverter ➜ Rear Right Drive Inverter Replacement ➜ Thermal System Test
    • Drive Unit ➜ Front Drive Unit Replacement ➜ Thermal System Test
    • Drive Unit ➜ Rear Drive Unit Replacement ➜ Thermal System Test
  47. Exit Service Mode.
  48. Install the rear underhood apron. See Underhood Apron - Rear (Remove and Replace).
  49. Install the 2nd row lower seat cushion. See Seat Cushion - Lower - 2nd Row (Remove and Replace).
  50. Restore the driver and front passenger seats back to their original positions.
  51. Refer to the Alignment Requirement tables to determine whether an EPAS alignment check (EC) or four wheel alignment check (AC) is necessary. If performed, add the alignment check/adjust as a separate activity. See Alignment Requirement - Suspension.