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Home >> Chevrolet >> 2009 >> TrailBlazer 4.2 S, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - Introduction >> Repair Instructions >> Engine Control Module Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: View Of ECM Bracket, Bolts & Nuts
    GM1922197Courtesy of GENERAL MOTORS CORP.
  1. If the ECM and bracket assembly was removed in order to access other components, proceed to step 5.
  2. If the ECM bracket was removed, perform the following steps, otherwise proceed to step 3:
    1. Install the ECM bracket (3) to the studs on the intake manifold.
      2. CAUTION: Refer to Fastener Caution .
    2. Install the ECM bracket bolts (2) and nuts (1) and tighten to 9 N.m (80 lb in).
    3. Fig 2: View Of ECM Removed From Bracket
    GM1922192Courtesy of GENERAL MOTORS CORP.
  3. Install the ECM (1) to the bracket.
    4. Fig 3: View Of ECM Bracket Retainers
    GM1922191Courtesy of GENERAL MOTORS CORP.
  4. Ensure that the retainers (1) completely engage and secure the ECM.
    5. Fig 4: View Of ECM Bracket Assembly, Nuts & Bolts
    GM1922570Courtesy of GENERAL MOTORS CORP.
  5. If the ECM and bracket assembly was removed in order to access other components, perform the following steps:
    1. Install the ECM and bracket assembly (3) to the studs on the intake manifold.
    2. Install the ECM bracket bolts (2) and nuts (1) and tighten to 9 N.m (80 lb in).
    6. Fig 5: Locating ECM Engine Wiring Harness Electrical Connectors
    GM1922190Courtesy of GENERAL MOTORS CORP.
  6. Connect the engine wiring harness electrical connectors (1) to the ECM.
  7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  8. If a NEW ECM was installed, program the ECM. Refer to Control Module References .
  9. Using a scan tool, set the remaining engine oil life.
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