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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Automatic Transmission - 8L45 (M5N) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Transmission Fluid Pump Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Fig 1: Exploded View of Transmission Fluid Pump Assembly With Tightening Sequence
    GM4926609Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Fluid Pump Locating Pin (1) - Install [2x]

  2. Automatic Transmission Fluid Pump Passage Sleeve (2) - Install
  3. Automatic Transmission Fluid Pump Drive Shaft Bushing (3) - Install
  4. Automatic Transmission Fluid Pump Seal-Large (4) - Install NEW
    5. NOTE:

    Install the seal onto the pump as shown. "Side Up", indicated by the arrow, should face away from the pump assembly.

  5. Automatic Transmission Fluid Pump Seal-Small (5) - Install NEW
  6. Automatic Transmission Fluid Pump (6) - Install
    7. CAUTION:

    Refer to Fastener Caution .

    NOTE:

    There are two different grade transmission fluid pump bolts. The bolt grade can be identified by looking at the top of the bolt head. Reinstall the automatic transmission fluid pump bolts in the previously noted locations.

  7. Install the 5 M6 x 28 automatic transmission fluid pump bolts (7) and tighten in sequence. Fastener Specifications
  8. GM3817155Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Due to transmission fluid pump chain tension, the control valve assembly and fluid pump sprocket must be installed simultaneously.

    Install the transmission fluid pump driven sprocket (1) onto the chain then position the sprocket and control valve body onto the chain.

  9. GM5461571Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Use care when handling the control valve body assembly. If dropped, damage to the control solenoid valve body assembly internal components may result.

    NOTE:

    Before installing the control valve solenoid body onto the transmission, document the 16-digit Part Unique Number (PUN). If the control valve solenoid body PUN has not been saved for reference, it may be necessary to disassemble the control valve solenoid body from the transmission to clearly read the control valve solenoid body PUN.

    Control Valve Body (3) - Install

  10. Install and hand tighten the 4 M6 x 68 control valve solenoid body bolts (2).
  11. Install and hand tighten the 7 M6 x 45 control valve solenoid body bolts (1).
    12. CAUTION:

    Refer to Fastener Caution .

  12. Tighten the control valve solenoid bolts (1) and (2) in sequence. Fastener Specifications
  13. GM3817155Courtesy of GENERAL MOTORS COMPANY

    Using a suitable pry tool, lock the transmission fluid pump driven sprocket retainer (2).

  14. GM3816771Courtesy of GENERAL MOTORS COMPANY

    Install the transmission control wiring harness (4) then connect the electrical connectors as needed.

  15. Install the transmission control wiring harness retainer (5).
  16. GM3816802Courtesy of GENERAL MOTORS COMPANY

    Connect the automatic transmission auxiliary fluid accumulator solenoid electrical connector

  17. Connect the manual valve (1) to the manual shift shaft position switch assembly linkage (2).
  18. Return the manual valve spring (2) to it's correct position.
  19. GM5460990Courtesy of GENERAL MOTORS COMPANY

    Manual Shift Detent Lever Spring (2) - Install

  20. Manual Shift Detent Lever Spring Bolt (1) - Install and tighten - Fastener Specifications
  21. GM5475519Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Fluid Baffle (2) - Install

    22. CAUTION:

    This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

  22. Automatic Transmission Fluid Baffle Bolt (1) - Install NEW and tighten [2x] - Fastener Specifications
  23. GM5441317Courtesy of GENERAL MOTORS COMPANY

    Automatic Transmission Fluid Filter (1) - Install - Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement 

  24. Reprogram the solenoid valve characterization reprogramming. Q77 Transmission Control Solenoid Valve Characterization Programming (8L45) , or Q77 Transmission Control Solenoid Valve Characterization Programming (10L60)
    25. NOTE:

    The Service Fast Learn procedure must be performed when one of the following repairs have been made to the vehicle. Failure to perform the procedure after one of the following repairs may result in poor transmission performance, as well as transmission DTCs being set:

    The service fast learn procedure must be performed when any of the following repairs has been made to the transmission.

    • Pressure regulating solenoid replacement
    • Valve body repair or replacement
    • Any service/repair in response to a shift quality concern
    • Any internal transmission service, repair, overhaul, or replacement
    • Torque converter replacement
    • Transmission control module replacement
    • Transmission assembly replacement
  25. Perform the transmission service fast learn procedure. Transmission Service Fast Learn Procedure 
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