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Home >> Chevrolet >> 2007 >> TrailBlazer 5.3 M, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L - Introduction (2 Of 2) >> Repair Instructions >> Engine Control Module Replacement >> Installation Procedure

Installation Procedure

    Fig 1: ECM/TCM Bracket Retaining Bolts
    GM1521466Courtesy of GENERAL MOTORS CORP.
  1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame.
  2. Install the ECM/TCM bracket retaining bolts (2).
  3. NOTE: Refer to Fastener Notice .
  4. Tighten the ECM/TCM bracket bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

  5. Install the TCM. Refer to Transmission Control Module Replacement .
  6. Fig 2: Identifying ECM/TCM Bracket Upper Retainers
    GM1804527Courtesy of GENERAL MOTORS CORP.
  7. Insert the ECM into the retaining slots of the ECM/TCM bracket.
  8. Secure the ECM to the bracket ensuring that the ECM retaining tabs (1) are fully engaged.
  9. Fig 3: View Of ECM
    GM1804524Courtesy of GENERAL MOTORS CORP.
  10. Connect the engine wiring harness electrical connectors to the ECM.
  11. Fig 4: View Of ECM/TCM & Cover
    GM1804523Courtesy of GENERAL MOTORS CORP.
  12. Install the ECM/TCM cover.
  13. Ensure the ECM/TCM cover retainers (1) are fully engaged to the ECM/TCM bracket.
  14. Connect the cooling fan electrical connector.
  15. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  16. If the ECM was replaced the replacement ECM must be programmed. Refer to Control Module References .