GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2008 🢒 Astra 🢒 Engine 🢒 Engine Controls and Fuel - 1.8L (2H0) 🢒 Engine Control Module Replacement

Removal Procedure

    Important: 

       • When returning a replaced control unit, do not clear the fault memory.
       • The security code must be reset using Tech 2 when replacing or interchanging the engine control module (before removal).

  1. Open the hood.
  2. Read out control unit data with a Tech 2. Refer to Diagnostic System Check - Vehicle .

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

    Important: The battery must not be disconnected until all consumers (e.g. fan) have ceased operation. However, a minimum waiting time of 30 seconds must be observed.

  3. Disconnect the battery.
    4. • Remove the ground connection from the ground terminal.
    • Loosen the nut.

    Object Number: 1945806 Size: SH
  4. Remove the wiring harness from the engine control module (ECM).

    5. Disconnect the 2 wiring harness plugs (1).

  5. Remove the ground cable (2) from the ECM.

    6. Remove the bolt.

  6. Remove the ECM.

    7. Remove the 4 bolts (3).

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.

  1. Install the ECM.

    2. Tighten
    Tighten the 4 bolts to 8 N·m (71 lb in).

  2. Install the ground cable to the ECM.

    3. Tighten
    Tighten the bolt to 8 N·m (71 lb in).

  3. Install the wiring harness to the ECM.

    4. Connect the 2 wiring harness plugs.

  4. Connect the battery.

    5. Install the ground connection to the ground terminal.

    Tighten
    Tighten the nut to 5 N·m (44 lb in).

  5. Upload the control unit data with Tech 2. Refer to Diagnostic System Check - Vehicle .
  6. For programming procedures, refer to Control Module References .
  7. Close the hood.