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Home >> Cadillac >> 2011 >> STS RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 3.6L - Repair Instructions >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

    Fig 1: Identifying Engine Wiring Harness Electrical Connectors & ECM
    GM1958191Courtesy of GENERAL MOTORS COMPANY
  1. Using a scan tool, retrieve the percentage of remaining engine oil and automatic transmission fluid life. Record the remaining engine oil and automatic transmission fluid life.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (With Side Post) , Battery Negative Cable Disconnection and Connection (With Top Post) .
    3. CAUTION:

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

  3. Unlock and disconnect the engine wiring harness electrical connectors (1) from the ECM (2).
    4. Fig 2: View Of Tabs, Retainers & ECM
    GM1958194Courtesy of GENERAL MOTORS COMPANY
  4. Use the tabs (3) in order to disengage the retainers (2) on the ECM bracket from the ECM (1) and remove the ECM.
    5. Fig 3: Identifying Locking Tabs
    GM1958196Courtesy of GENERAL MOTORS COMPANY
  5. If replacing the ECM bracket perform the following steps, otherwise proceed to step 4 in the installation procedure.
  6. Using a small flat-bladed tool, depress the locking tabs (1) on the ECM bracket.
    7. Fig 4: View Of ECM Bracket
    GM1958236Courtesy of GENERAL MOTORS COMPANY
  7. Slide up and remove the ECM bracket (1).
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