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Home >> Saturn >> 2004 >> Ion Red Line >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (Introduction) >> Repair Instructions >> Camshaft Position (CMP) Sensor Replacement >> Removal Procedure
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Removal Procedure

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  2. Raise the vehicle on a hoist until the tires are off the ground. Refer toLifting and Jacking the Vehicle in General Information.
  3. Remove the right front tire. Refer toTire and Wheel Removal and Installation in Tires and Wheels.
  4. Remove the inner right side splash shield to gain access to the crankshaft pulley. Refer to Splash Shield Replacement - Engine in Body Front End.
  5. Remove the #4 ignition coil and spark plug.
  6. Rotate the engine to bring the cylinder #4 to top dead center (TDC) compression stroke.

    The crankshaft pulley-timing notch should be aligned with the timing mark on the front cover.

    7. Fig 1: View Of Timing Mark
    GM1536874Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: To determine a #4 TDC compression stroke, rotate the engine by the crankshaft pulley. A puff of air will be felt as the piston travels upward on the compression stroke. Once a puff of air is felt, continue to rotate the crankshaft pulley until the timing mark is aligned as shown in illustration.
  7. Remove the engine control module (ECM) from the mounting bracket.
  8. Remove the underhood electrical center. Refer toUnderhood Electrical Center or Junction Block Bracket Replacement in Wiring Systems.
  9. Remove the two fasteners holding the clutch master cylinder to the front of the dash to allow easier access to the camshaft position sensor housing.
  10. Remove the brake booster vacuum hose from the supercharger and set aside.
  11. Remove the two fasteners holding the camshaft position sensor housing assembly to the cylinder head.
  12. Slide the camshaft position sensor housing assembly back away from the cylinder head.
  13. Remove and discard the camshaft position sensor housing seal.
  14. Using a shop towel, wipe clean the "Cog" of the trigger and the mating surfaces of the camshaft position sensor housing assembly and the cylinder head.
  15. Install a NEW camshaft position sensor housing seal.
    16. IMPORTANT: Make sure the "Cog" does not rotate before it seats inside the camshaft.
  16. Align the timing mark on the "Cog" to the timing mark on the camshaft position sensor housing assembly.
    17. Fig 2: View Of CMP Sensor
    GM153876Courtesy of GENERAL MOTORS CORP.
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