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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1844 (Engine Controls And Fuel - 2.4L (Lat) - Introduction (2 Of 2)) >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Body Wiring Harness Electrical Connector At Engine Control Module (ECM)
    GM1814521Courtesy of GENERAL MOTORS CORP.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Remove the generator battery control module cover. Refer to Generator Battery Control Module Cover Replacement .
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (2.4L (LAT)) .
  4. Disconnect the body wiring harness electrical connector (1) from the engine control module (ECM).
    5. Fig 2: Engine Wiring Harness Electrical Connectors At Engine Control Module (ECM)
    GM1814522Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the engine wiring harness electrical connectors (2) from the ECM.
    6. Fig 3: Identifying Hybrid-Related Harness Retainers
    GM1820895Courtesy of GENERAL MOTORS CORP.
  6. Remove the 36 volt positive battery cable retainer (4) from the ECM bracket.
    7. Fig 4: Identifying ECM Bracket And ECM
    GM1813961Courtesy of GENERAL MOTORS CORP.
    NOTE: Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables or when charging the vehicles battery.
  7. Remove the ECM bracket (1) from the battery hold down bracket.
  8. Remove the ECM (2) from the ECM bracket.
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