GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Engine 🢒 Engine Mechanical - 3.6L 🢒 Engine Wiring Harness Assembly Installation

    Object Number: 945456 Size: SH
  1. Install the engine control module (ECM) bracket.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Loosely install the ECM bracket bolts.

    3. Tighten

    1. Tighten the side ECM bracket bolts to 10 N·m (89 lb in).
    2. Tighten the front ECM bracket bolts to 23 N·m (17 lb ft).

    Object Number: 945462 Size: SH
  3. Install the ECM module to the ECM bracket.
  4. Install the ECM module bolts.

    5. Tighten
    Tighten the ECM module bolts to 10 N·m (89 lb in).


    Object Number: 945788 Size: SH
  5. Install the engine wiring harness to the engine.

    6. Object Number: 945779 Size: SH
  6. Connect the engine wiring harness to the right camshaft position sensors.

    7. Object Number: 945775 Size: SH
  7. Install the engine wiring harness ground bolt to the ECM bracket.

    8. Tighten
    Tighten the engine wiring harness ground bolt to 10 N·m (89 lb in).


    Object Number: 945769 Size: SH
  8. Install the engine wiring harness ground bolt to the side of the right cylinder head.

    9. Tighten
    Tighten the engine wiring harness ground bolt to 10 N·m (89 lb in).


    Object Number: 945766 Size: SH
  9. Connect the engine wiring harness to the evaporative emission (EVAP) solenoid.

    10. Object Number: 945748 Size: SH
  10. Connect the engine wiring harness to the right oxygen sensor harness.

    11. Object Number: 945742 Size: SH
  11. Connect the engine wiring harness to the right knock sensor.

    12. Object Number: 945738 Size: SH
  12. Connect the engine wiring harness to the generator.

    13. Object Number: 945733 Size: SH
  13. Connect the engine wiring harness to the fuel injector harness.

    14. Object Number: 945711 Size: SH
  14. Connect the engine wiring harness to the right ignition coils.

    15. Object Number: 945689 Size: SH
  15. Connect the engine wiring harness to the right camshaft position actuator valves.

    16. Object Number: 945682 Size: SH
  16. Connect the engine wiring harness to the front of the right camshaft cover.

    17. Object Number: 945670 Size: SH
  17. Position the ECM ground harness ring terminal to ECM lug and install the ECM ground harness ring terminal screw.

    18. Tighten
    Tighten the ECM ground harness ring terminal screw to 4.5 N·m (40 lb in).


    Object Number: 945597 Size: SH
  18. Connect the engine wiring harness to the left side of the throttle body/intake manifold.

    19. Object Number: 945536 Size: SH
  19. Connect the engine wiring harness to the top of the right camshaft cover.

    20. Object Number: 945521 Size: SH
  20. Install the engine wiring harness bracket bolt to the top of the ECM bracket.

    21. Tighten
    Tighten the engine wiring harness bracket bolt to 10 N·m (89 lb in).


    Object Number: 945513 Size: SH
  21. Install the engine wiring harness bracket bolt to the side of the ECM bracket.

    22. Tighten
    Tighten the engine wiring harness bracket bolt to 23 N·m (17 lb ft).


    Object Number: 945468 Size: SH
  22. Connect the engine wiring harness to the crankshaft position sensor.
  23. Install the engine wiring harness bracket bolt.

    24. Tighten
    Tighten the engine wiring harness bracket bolt to 50 N·m (37 lb ft).


    Object Number: 945720 Size: SH
  24. Connect the engine wiring harness to the ECM module.

    25. Object Number: 945449 Size: SH
  25. Install the battery cable ground.
  26. Install the battery cable ground bolt to the rear of the left cylinder head.

    27. Tighten
    Tighten the battery cable ground bolt to 50 N·m (37 lb ft).


    Object Number: 945443 Size: SH
  27. Connect the battery cable to the generator.
  28. Install the battery cable/generator nut to the generator.

    29. Tighten
    Tighten the battery cable/generator nut to 13 N·m (115 lb in).


    Object Number: 945439 Size: SH
  29. Connect the battery cable harness to the right side of the engine.

    30. Object Number: 945437 Size: SH
  30. Connect the engine wiring harness to the barometric pressure (BARO) sensor.

    31. Object Number: 945434 Size: SH
  31. Connect the engine wiring harness to the left camshaft position sensors.

    32. Object Number: 945431 Size: SH
  32. Install the engine wiring harness ground bolt to the left cylinder head.

    33. Tighten
    Tighten the engine wiring harness ground bolt to 10 N·m (89 lb in).


    Object Number: 945424 Size: SH
  33. Connect the engine wiring harness to the engine coolant temperature (ECT) sensor.

    34. Object Number: 945417 Size: SH

    Notice: Ensure proper engagement of the wiring harness connector. The wiring harness connector must be installed straight onto the component connector and firmly seated. Visually inspect the connector to ensure that the connector latches are engaged and locked. Any damage to the connector or wiring must be repaired. Failure to follow this procedure can lead to an intermittent electrical connection, driveability concerns, and/or wiring harness or wiring harness connector damage or failure.

  34. Connect the engine wiring harness to the throttle body connector.

    35. Object Number: 945408 Size: SH
  35. Connect the engine wiring harness to the starter motor solenoid.

    36. Object Number: 945400 Size: SH
  36. Connect the engine wiring harness to the left oxygen sensor harness.

    37. Object Number: 945276 Size: SH
  37. Connect the engine wiring harness to the oil pressure sender.

    38. Object Number: 945390 Size: SH
  38. Connect the engine wiring harness to the communicator valve.

    39. Object Number: 945380 Size: SH
  39. Connect the engine wiring harness to the left knock sensor.

    40. Object Number: 945375 Size: SH
  40. Connect the engine wiring harness to the left ignition coils.

    41. Object Number: 945358 Size: SH
  41. Connect the engine wiring harness to the left camshaft position actuator valves.

    42. Object Number: 945350 Size: SH
  42. Connect the engine wiring harness to the A/C compressor.

    43. Object Number: 945343 Size: SH
  43. Connect the engine wiring harness to the front of the left camshaft cover.

    44. Object Number: 945337 Size: SH
  44. Connect the engine wiring harness to the top of the left camshaft cover.

    45. Object Number: 945329 Size: SH
  45. Install the engine wiring harness bracket bolts to the lower left side of the engine.

    46. Tighten
    Tighten the engine wiring harness bracket bolts to 10 N·m (89 lb in).


    Object Number: 945316 Size: SH
  46. Install the engine wiring harness bracket bolt to the lower right side of the engine.

    47. Tighten
    Tighten the engine wiring harness bracket bolt to 10 N·m (89 lb in).

  47. Install the engine wiring harness bracket stud to the lower right side of the engine.

    48. Tighten
    Tighten the engine wiring harness bracket stud to 22 N·m (16 lb ft).


    Object Number: 945310 Size: SH
  48. Connect the battery cable harness to the starter motor.

    49. Object Number: 945302 Size: SH
  49. Install the radiator outlet pipe.
  50. Install the radiator outlet pipe bolt to the thermostat housing and the generator bracket.

    51. Tighten
    Tighten the radiator outlet pipe bolt to the thermostat housing and the generator bracket to 10 N·m (89 lb in).

  51. Install the radiator outlet pipe bolt to the rear of the right cylinder head.

    52. Tighten
    Tighten the radiator outlet pipe bolt to 50 N·m (27 lb ft).


    Object Number: 1370536 Size: SH
  52. Install the right exhaust manifold lower insulator.
  53. Install the right exhaust manifold lower insulator nuts.

    54. Tighten
    Tighten the right exhaust manifold lower insulator nuts to 10 N·m (89 lb in).


    Object Number: 1370531 Size: SH
  54. Install the intake manifold insulator.
  55. Install the intake manifold insulator nut.

    56. Tighten
    Tighten the intake manifold insulator nut to 10 N·m (89 lb in).