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Home >> GMC >> 2004 >> Sierra 2500 HD, 2D Pickup, 6.6 1, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.6L (Lb7) (Introduction) >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Installation Procedure

Installation Procedure

  1. Install the ECM.

    Ensure that the mounting tabs are engaged.

  2. Secure the spring latch to the ECM.
    3. Fig 1: ECM & Mounting Tabs
    GM877695Courtesy of GENERAL MOTORS CORP.
  3. Connect the ECM electrical connectors (3).
    4. NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Tighten the ECM electrical connector bolts (2).

    Tighten:  Tighten the bolts to 8 N.m (71 lb in).

    5. Fig 2: View Of ECM Electrical Connector & Bolts
    GM877694Courtesy of GENERAL MOTORS CORP.
  5. Install the ECM cover.
    6. Fig 3: View Of ECM Cover & Mounting Bracket
    GM814118Courtesy of GENERAL MOTORS CORP.
  6. If equipped with the Allison transmission RPO M74, install the engine harness clip to the ECM cover.
    7. Fig 4: Engine Harness Clip At ECM Cover
    GM877692Courtesy of GENERAL MOTORS CORP.
  7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  8. If a NEW ECM was installed, program the ECM. Refer to Service Programming System (SPS) in Programming.
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