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Home >> Hummer >> 2009 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - Repair Instructions) >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

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    Fig 1: Engine Control Module (ECM) Components
    GM1703437Courtesy of GENERAL MOTORS CORP.
  1. Record the current Engine Oil Life percentage, and use a scan tool to update the NEW ECM, if replacing.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Disengage the engine wiring harness upper electrical connector retainer (2) and remove the connector (1) from the ECM.
  4. Disengage the engine wiring harness lower electrical connector retainer (3) and remove the connector (4) from the ECM.
    5. Fig 2: ECM And Bracket
    GM1703439Courtesy of GENERAL MOTORS CORP.
  5. Disengage the retainer tabs securing the ECM to the bracket.
  6. Remove the ECM.
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