GM Service Manual Online
For 1990-2009 cars only

Engine Control Module Replacement Non European Emissions

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1256170  Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the front floor cover of the passenger.
  3. Remove the ECM retaining nuts.
  4. Remove the ECM cover.

  5. Object Number: 1256171  Size: SH
  6. Disconnect the ECM connectors from the ECM.

Installation Procedure


    Object Number: 1256171  Size: SH
  1. Aline the ECM into the mounting base.
  2. Connect the ECM connectors to the ECM.

  3. Object Number: 1256170  Size: SH
  4. Install the front floor cover of the passenger.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the ECM retaining nuts.
  7. Tighten
    Tighten the ECM retaining nuts to 8 N·m (71 lb in).

  8. Connect the negative battery cable.

Engine Control Module Replacement European Emissions

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1265329  Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the air intake tube and resonator.
  3. Disconnect the engine control module (ECM) connectors from the ECM.
  4. Remove the ECM.

Installation Procedure


    Object Number: 1265329  Size: SH
  1. Connect the ECM connectors to the ECM.
  2. Align the ECM into the mounting base.
  3. Snap the ECM into its mounting base.
  4. Install the ECM trim locks.
  5. Install the passenger side kick panel.
  6. Connect the negative battery cable.
  7. Perform the following procedures:
  8. • Program the ECM.
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