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Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Mechanical - 3.6L (Ly7) (Repair Procedures -- 2 Of 5)) >> Repair Instructions (On-Vehicle Part 2 & Off-Vehicle - Part 1) >> Off-Vehicle Repair Instructions - Part 1 >> Engine Wiring Harness Assembly Removal

Engine Wiring Harness Assembly Removal

WARNING: This page is about a different variant/trim than selected.
  1. Remove the intake manifold insulator nut.
  2. Remove the intake manifold insulator.
    Fig 1: Removing & Installing Intake Manifold Insulator
    GM1370531Courtesy of GENERAL MOTORS CORP.
    3. Fig 2: Removing Right Exhaust Manifold Lower Insulator Shield
    GM1370536Courtesy of GENERAL MOTORS CORP.
  3. Remove the right exhaust manifold lower insulator nuts.
  4. Remove the right exhaust manifold lower insulator shield.
    5. Fig 3: View Of Radiator Outlet Pipe & Bolt
    GM945302Courtesy of GENERAL MOTORS CORP.
  5. Remove the radiator outlet pipe bolts.
  6. Remove the radiator outlet pipe.
    7. Fig 4: Identifying Battery Cable Harness At Starter Motor
    GM945310Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the battery cable harness from the starter motor.
    8. Fig 5: Locating Engine Wiring Harness Bracket Bolt & Engine Wiring Harness Bracket Stud
    GM945316Courtesy of GENERAL MOTORS CORP.
  8. Remove the engine wiring harness bracket bolt and stud from the lower right side of the engine.
    9. Fig 6: Removing & Installing Engine Wiring Harness Bracket Bolts From Lower Left Side Of Engine
    GM945329Courtesy of GENERAL MOTORS CORP.
  9. Remove the engine wiring harness bracket bolts from the lower left side of the engine.
    10. Fig 7: View Of Left Camshaft Cover Wiring Harness Connectors
    GM945337Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the engine wiring harness from the top of the left camshaft cover.
    11. Fig 8: View Of Left Camshaft Cover Wiring Harness Connector - Front
    GM945343Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the engine wiring harness from the front of the left camshaft cover.
    12. Fig 9: Identifying Engine Wiring Harness At A/C Compressor
    GM945350Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the engine wiring harness from the A/C compressor.
    13. Fig 10: Identifying Engine Wiring Harness Front Left Camshaft Position Actuator Valves
    GM945358Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the engine wiring harness from the left camshaft position actuator valves.
    14. Fig 11: View Of Left Ignition Coils Wiring Harness Connectors
    GM945375Courtesy of GENERAL MOTORS CORP.
  14. Disconnect the engine wiring harness from the left ignition coils.
    15. Fig 12: View Of Left Knock Sensor And Electrical Connector
    GM945380Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the engine wiring harness from the left knock sensor.
    16. Fig 13: View Of Communicator And Intake Manifold Runner Control Solenoid Electrical Connectors
    GM945390Courtesy of GENERAL MOTORS CORP.
  16. Disconnect the engine wiring harness from the communicator valve.
    17. Fig 14: Identifying Engine Wiring Harness At Oil Pressure Sender
    GM945276Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the engine wiring harness from the oil pressure sender.
    18. Fig 15: Identifying Engine Wiring Harness At Left Oxygen Sensor Harness
    GM945400Courtesy of GENERAL MOTORS CORP.
  18. Disconnect the engine wiring harness from the left oxygen sensor harness.
    19. Fig 16: Identifying Engine Wiring Harness At Starter Solenoid
    GM945408Courtesy of GENERAL MOTORS CORP.
  19. Disconnect the engine wiring harness from the starter motor solenoid.
    20. Fig 17: View Of Throttle Body Electrical Connector
    GM945417Courtesy of GENERAL MOTORS CORP.
    NOTE: DO NOT use any mechanical device such as pliers or screwdrivers to disengage the connector. In order to prevent damage to the connector or harness wiring, both of the latches on the connector must be depressed with finger pressure only. When the latches are depressed the connector must then be pulled straight back without pulling on the wires in order to disengage. Failure to follow this procedure can lead to connector or wiring harness damage and failure.
  20. Disconnect the engine wiring harness from the throttle body connector.
    21. Fig 18: View Of Coolant Temperature Sensor And Electrical Connector
    GM945424Courtesy of GENERAL MOTORS CORP.
  21. Disconnect the engine wiring harness from the engine coolant temperature (ECT) sensor.
    22. Fig 19: View Of Left Cylinder Head Wiring Harness Ground Bolt
    GM945431Courtesy of GENERAL MOTORS CORP.
  22. Remove the engine wiring harness ground bolt from the left cylinder head.
    23. Fig 20: Identifying Electrical Wiring Harness At Left Camshaft Position Sensors
    GM945434Courtesy of GENERAL MOTORS CORP.
  23. Disconnect the engine wiring harness from the left camshaft position sensors.
    24. Fig 21: Identifying Barometric Pressure Sensor And Electrical Connector
    GM945437Courtesy of GENERAL MOTORS CORP.
  24. Disconnect the engine wiring harness from the barometric (BARO) sensor.
    25. Fig 22: Identifying Battery Cable Harness At Right Side Of Engine
    GM945439Courtesy of GENERAL MOTORS CORP.
  25. Disconnect the battery cable harness from the right side of the engine.
    26. Fig 23: Identifying Battery Cable/Generator Nut At Generator
    GM945443Courtesy of GENERAL MOTORS CORP.
  26. Remove the battery cable/generator nut from the generator.
  27. Disconnect the battery cable from the generator.
    28. Fig 24: Battery Cable Ground Bolt At The Rear Of The Right Cylinder Head
    GM945449Courtesy of GENERAL MOTORS CORP.
  28. Remove the battery cable ground bolt from the rear of the right cylinder head.
  29. Remove the battery cable ground.
    30. Fig 25: View Of ECM Wiring Harness Connector
    GM945720Courtesy of GENERAL MOTORS CORP.
  30. Disconnect the engine wiring harness from the engine control module (ECM).
    31. Fig 26: Identifying Engine Wiring Harness At Crankshaft Position Sensor
    GM945468Courtesy of GENERAL MOTORS CORP.
  31. Disconnect the engine wiring harness from the crankshaft position sensor.
  32. Remove the engine wiring harness bracket bolt.
    33. Fig 27: View Of Engine Wiring Harness Bracket Bolt - Side Of ECM Bracket
    GM945513Courtesy of GENERAL MOTORS CORP.
  33. Remove the engine wiring harness bracket bolt from the side of the ECM bracket.
    34. Fig 28: View Of Engine Wiring Harness Bracket Bolt - Top Of ECM Bracket
    GM945521Courtesy of GENERAL MOTORS CORP.
  34. Remove the engine wiring harness bracket bolt from the top of the ECM bracket.
    35. Fig 29: View Of Right Camshaft Cover Wiring Harness Connector - Top
    GM945536Courtesy of GENERAL MOTORS CORP.
  35. Disconnect the engine wiring harness from the top of the right camshaft cover.
    36. Fig 30: Identifying Engine Wiring Harness At Left Side Of Throttle Body/Intake Manifold
    GM945597Courtesy of GENERAL MOTORS CORP.
  36. Disconnect the engine wiring harness from the left side of the throttle body/intake manifold.
    37. Fig 31: Identifying ECM Ground Harness Terminal Screw At ECM Lug
    GM945670Courtesy of GENERAL MOTORS CORP.
  37. Remove the ECM ground harness terminal screw from the ECM lug.
    38. Fig 32: View Of Right Camshaft Cover Wiring Harness Connector - Front
    GM945682Courtesy of GENERAL MOTORS CORP.
  38. Disconnect the engine wiring harness from the front of the right camshaft cover.
    39. Fig 33: Identifying Engine Wiring Harness At Right Camshaft Position Actuator Valves
    GM945689Courtesy of GENERAL MOTORS CORP.
  39. Disconnect the engine wiring harness from the right camshaft position actuator valves.
    40. Fig 34: View Of Right Ignition Coils Electrical Connectors
    GM945711Courtesy of GENERAL MOTORS CORP.
  40. Disconnect the engine wiring harness from the right ignition coils.
    41. Fig 35: Identifying Engine Wiring Harness At Fuel Injector Harness
    GM945733Courtesy of GENERAL MOTORS CORP.
  41. Disconnect the engine wiring harness from the fuel injector harness.
    42. Fig 36: Identifying Engine Wiring Harness At Generator
    GM945738Courtesy of GENERAL MOTORS CORP.
  42. Disconnect the engine wiring harness from the generator.
    43. Fig 37: View Of Right Knock Sensor And Electrical Connector
    GM945742Courtesy of GENERAL MOTORS CORP.
  43. Disconnect the engine wiring harness from the right knock sensor.
    44. Fig 38: Identifying Engine Wiring Harness At Right Oxygen Sensor Harness
    GM945748Courtesy of GENERAL MOTORS CORP.
  44. Disconnect the engine wiring harness from the right oxygen sensor harness.
    45. Fig 39: Identifying Engine Harness At EVAP Solenoid
    GM945766Courtesy of GENERAL MOTORS CORP.
  45. Disconnect the engine wiring harness from the evaporative emission (EVAP) solenoid.
    46. Fig 40: View Of Wiring Harness Ground Bolt At Side Of Right Cylinder Head
    GM945769Courtesy of GENERAL MOTORS CORP.
  46. Remove the engine wiring harness ground bolt from the side of the right cylinder head.
    47. Fig 41: Removing & Installing Engine Wiring Harness Ground Bolt At ECM Bracket
    GM945775Courtesy of GENERAL MOTORS CORP.
  47. Remove the engine wiring harness ground bolt from the ECM bracket.
    48. Fig 42: Identifying Engine Wiring Harness At Right Camshaft Position Sensors
    GM945779Courtesy of GENERAL MOTORS CORP.
  48. Disconnect the engine wiring harness from the right camshaft position sensors.
    49. Fig 43: Identifying Engine Wiring Harness
    GM945788Courtesy of GENERAL MOTORS CORP.
  49. Remove the engine wiring harness from the engine.
    50. Fig 44: Removing & Installing ECM
    GM945462Courtesy of GENERAL MOTORS CORP.
  50. Remove the ECM module bolts.
  51. Remove the ECM module from the ECM bracket.
    52. Fig 45: Removing & Installing ECM Bracket Bolts
    GM945456Courtesy of GENERAL MOTORS CORP.
  52. Remove the ECM bracket bolts.
  53. Remove the ECM bracket.
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