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Home >> Buick >> 2016 >> Cascada Base >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Repair Instructions >> Engine Control Module Wiring Harness Replacement >> Removal Procedure

Removal Procedure

  1. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection .
  2. Remove the engine sight shield. Refer to Engine Sight Shield Replacement .
    3. Fig 1: Engine Control Module And Heated Oxygen Wiring Harness Plugs
    GM2888716Courtesy of GENERAL MOTORS COMPANY
  3. Disconnect the 3 engine control module wiring harness plugs (2).
  4. Disconnect the 3 heated oxygen sensor wiring harness plugs (2) and unclip the wiring harness plug from the bracket.
  5. Unclip the 2 wiring harness retainers (3).
  6. Remove the battery tray. Refer to Battery Tray Replacement .
  7. Remove the front compartment fuse block. Refer to Front Compartment Fuse Block Replacement .
    8. Fig 2: Wiring Harness Ground Cable
    GM2506210Courtesy of GENERAL MOTORS COMPANY
  8. Remove the wiring harness ground cable nut (2) and remove the wiring harness ground cable (3).
  9. Remove the wiring harness plug (1) in top direction from the front compartment fuse block housing.
  10. Disconnect the wiring harness connection adapter plug (4).
    11. Fig 3: Harness Plugs And Retainers
    GM2888730Courtesy of GENERAL MOTORS COMPANY
  11. For manual transmission, disconnect the backup lamp switch wiring harness plug (3).
  12. If equipped for manual transmission, disconnect the neutral gear sensor wiring harness plug (2).
  13. Unclip the 2 wiring harness retainers (1).
    14. Fig 4: Transmission Control Module Wiring Harness Plug And Retainer
    GM2888731Courtesy of GENERAL MOTORS COMPANY
  14. For automatic transmission, disconnect the transmission control module wiring harness plug (2).
  15. Unclip the wiring harness retainer (1).
    16. Fig 5: Coolant Hose At Charge Air Cooler Outlet Air Hose Retainer
    GM2888732Courtesy of GENERAL MOTORS COMPANY
  16. Unclip the coolant hose (3) from the charge air cooler outlet air hose retainer.
  17. Loosen the clamp (1).
  18. Remove the charge air cooler outlet air hose (2) from the throttle body adapter. Hang the hose aside.
    19. Fig 6: Harness Plugs And Ground Cable
    GM2888733Courtesy of GENERAL MOTORS COMPANY
  19. Disconnect the fuel injection wiring harness plug (3).
  20. Disconnect the exhaust camshaft position sensor wiring harness plug (1).
  21. Disconnect the intake camshaft position sensor wiring harness plug (5).
  22. Disconnect the engine coolant temperature wiring harness plug (6).
  23. Remove the engine wiring harness ground cable bolt (6) and the ground cable (7).
  24. Unclip the 2 wiring harness retainers (2, 4).
    25. Fig 7: Harness Plugs And Retainers
    GM2888734Courtesy of GENERAL MOTORS COMPANY
  25. Disconnect the fuel pump wiring harness plug (5).
  26. Disconnect the intake air pressure/temperature sensor wiring harness plug (1).
  27. Disconnect the throttle body wiring harness plug (3).
  28. Unclip the 3 wiring harness retainers (2, 4).
    29. Fig 8: Ignition Coil Wiring Harness Plugs And Retainers
    GM2888735Courtesy of GENERAL MOTORS COMPANY
  29. Disconnect the 4 ignition coil wiring harness plugs (2).
  30. Unclip the 2 wiring harness retainers (1).
    31. Fig 9: Wiring Harness PlugsAnd Retainers
    GM2888736Courtesy of GENERAL MOTORS COMPANY
  31. Disconnect the engine oil pressure wiring harness plug (3).
  32. Disconnect the intake camshaft actuator solenoid valve wiring harness plug (5).
  33. Disconnect the evaporative emission canister purge solenoid valve wiring harness plug (1).
  34. Unclip the 3 wiring harness retainers (2, 4).
    35. Fig 10: Mass Air Flow Sensor Wiring Harness Plug And Retainers
    GM2888746Courtesy of GENERAL MOTORS COMPANY
  35. Disconnect the mass air flow sensor wiring harness plug (1).
  36. Unclip the 3 wiring harness retainers (2).
  37. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
    38. Fig 11: Harness Plugs And Retainers
    GM2888747Courtesy of GENERAL MOTORS COMPANY
  38. Disconnect the exhaust camshaft position actuator solenoid valve wiring harness plug (2).
  39. Disconnect the turbocharger wastegate regulator solenoid valve wiring harness plug (3).
  40. Disconnect the engine coolant thermostat wiring harness plug (4).
  41. Unclip the 4 wiring harness retainers (1, 5).
  42. Raise and support the vehicle. Lifting and Jacking the Vehicle .
    43. Fig 12: Harness Plugs And Retainers
    GM2888748Courtesy of GENERAL MOTORS COMPANY
  43. Disconnect the charge air bypass valve wiring harness plug (2).
  44. Disconnect the knock sensor wiring harness plug (3).
  45. Disconnect the oil pump flow wiring harness plug (5).
  46. Disconnect the heated oxygen sensor wiring harness plug (4).
  47. Disconnect the generator wiring harness plug (6).
  48. Disconnect the starter wiring harness plug (8).
  49. Disconnect the crankshaft position sensor wiring harness plug (10).
  50. Disconnect the engine oil level sensor wiring harness plug (9).
  51. Disconnect the heater inlet pump wiring harness plug (1).
  52. Unclip the 5 wiring harness retainers (4).
    53. Fig 13: AC Compressor Wiring Harness Plugs
    GM2888749Courtesy of GENERAL MOTORS COMPANY
  53. Disconnect the 2 AC compressor wiring harness plugs (1, 2).
  54. Lower the vehicle.
  55. Remove the engine control module wiring harness from the vehicle.
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