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Home >> GMC >> 2012 >> Acadia SLT, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls/Fuel - 3.6L - Repair Instructions >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

    Fig 1: Identifying ECM Middle & Lower Electrical Connectors
    GM1857962Courtesy of GENERAL MOTORS COMPANY
  1. Turn the ignition OFF.
  2. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  4. Disconnect the engine wiring harness middle and lower electrical connectors (1) from the ECM .
    5. Fig 2: View Of Engine Wiring Harness Clip & ECM Upper Electrical Connector
    GM1857961Courtesy of GENERAL MOTORS COMPANY
  5. If also replacing the ECM bracket, remove the engine wiring harness clip (2) from the ECM bracket tab.
  6. Disconnect the engine wiring harness upper electrical connector (1) from the ECM.
    7. Fig 3: Identifying ECM Retaining Tab
    GM1857963Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.

  7. Gently lift up the retaining tab (1) and lift the ECM up and out of the support brackets on the ECM bracket.
    8. Fig 4: View Of ECM Bracket & Bolts
    GM1857965Courtesy of GENERAL MOTORS COMPANY
  8. If necessary, remove the ECM bracket bolts (1) and bracket.
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