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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - Introduction >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure
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Removal Procedure

  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
    2. Fig 1: Locating PCM & Engine Wiring Harness PCM Connectors
    GM1560062Courtesy of GENERAL MOTORS CORP.
  2. Disengage the connector position assurance (CPA) retainers.
  3. Disconnect the engine wiring harness ECM connectors from the ECM.
    4. Fig 2: Locating PCM & Body Wiring Harness PCM Connector
    GM1560063Courtesy of GENERAL MOTORS CORP.
  4. Disengage the CPA retainer.
  5. Disconnect the body wiring harness ECM connector from the ECM.
    6. Fig 3: Removing/Installing PCM
    GM1560061Courtesy of GENERAL MOTORS CORP.
    CAUTION: Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.
  6. Disengage the ECM bracket mounting tabs, while removing the ECM (1).
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