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Home >> Oldsmobile >> 2004 >> Bravada AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1743 (Engine Control System - 5.3L - Introduction) >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Removal Procedure
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Removal Procedure

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    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 cooling fan electrical connector for additional clearance while removing the ECM.
    4. Fig 1: ECM/TCM Cover & Bracket
    GM1521469Courtesy of GENERAL MOTORS CORP.
  4. Depress the ECM/transmission control module (TCM) cover retainers (2).
  5. Remove the ECM/TCM cover from the ECM/TCM bracket (1).
    6. Fig 2: ECM Electrical Connectors
    GM1521497Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: It is not necessary to disconnect the ECM electrical connectors in order to remove the ECM from the ECM/TCM bracket. Only disconnect the electrical connectors if servicing of component requires disconnecting of the electrical connectors.
    NOTE: Refer to Handling ESD Sensitive Parts Notice in Cautions and Notices.
    IMPORTANT: Remove any debris from around the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM.
  6. Disconnect the ECM electrical connectors (2) from the ECM (1)
    7. Fig 3: ECM Electrical Connectors
    GM1521502Courtesy of GENERAL MOTORS CORP.
  7. Release the bracket ECM retainers (1).
  8. Tilt the ECM (2) away from the ECM/TCM bracket.
    9. Fig 4: Removing/Installing Engine Control Module (ECM) To/From Bracket
    GM1521503Courtesy of GENERAL MOTORS CORP.
  9. Remove the ECM (2) from the ECM bracket (1).
    10. Fig 5: ECM/TCM Bracket
    GM1521468Courtesy of GENERAL MOTORS CORP.
  10. Only when replacement of the ECM/TCM bracket (2) is necessary, remove the TCM (1). Refer to Transmission Control Module (TCM) Replacement in Automatic Transmission - 4L60-E/4L65-E.
    11. Fig 6: ECM/TCM Bracket Retaining Bolts
    GM1521466Courtesy of GENERAL MOTORS CORP.
  11. Remove the ECM/TCM bracket retaining bolts (2).
  12. Remove the ECM/TCM bracket (1) from the vehicle frame.
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