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Home >> Saturn >> 2004 >> Ion 1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (Introduction) >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Removal Procedure
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Removal Procedure

    IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last engine oil change.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  3. Disconnect the small ECM harness connector (3) from the ECM.
  4. Remove the bolt retaining the large ECM connector to the ECM.
  5. Disconnect the large ECM harness connector (4) from the ECM.
    6. Fig 1: View Of Engine Electrical Center
    GM873343Courtesy of GENERAL MOTORS CORP.
  6. Use the retaining tab to release the ECM from the underhood junction block bracket.
    7. Fig 2: View Of ECM
    GM857196Courtesy of GENERAL MOTORS CORP.
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