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Home >> GMC >> 2009 >> Envoy 5.3 M, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L & 6.0L - Introduction >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure

Removal Procedure

    Fig 1: View Of ECM/TCM & Cover
    GM1804523Courtesy of GENERAL MOTORS CORP.
  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 Disconnection and Connection .
  3. Disconnect the cooling fan electrical connector for additional clearance while removing the ECM.
  4. Squeeze the ECM/transmission control module (TCM) cover upper retainers (1) in.
  5. Remove the ECM/TCM cover.
    6. Fig 2: View Of ECM
    GM1804524Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Handling Electrostatic Discharge Sensitive Parts Caution .
    NOTE:
    • 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.
    • 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 engine wiring harness electrical connectors from the ECM.
    7. Fig 3: Identifying ECM/TCM Bracket Upper Retainers
    GM1804527Courtesy of GENERAL MOTORS CORP.
  7. Release the ECM/TCM bracket upper retainers (1).
  8. Tilt the ECM away from the bracket and remove the ECM.
    9. Fig 4: Identifying ECM/TCM Bracket Retaining Bolts
    GM1521466Courtesy of GENERAL MOTORS CORP.
  9. If replacement of the ECM/TCM bracket is required, remove the TCM. Refer to Transmission Control Module Replacement (LL8) or Transmission Control Module Replacement (LH6) .
  10. Remove the ECM/TCM bracket retaining bolts (2).
  11. Remove the ECM/TCM bracket (1) from the vehicle frame.
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