GM Service Manual Online
For 1990-2009 cars only

Notice: 

   • Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module (battery cable, powertrain control module (PCM)/engine control module (ECM)/transaxle control module (TCM) pigtail, control module fuse, jumper cables, etc.) in order to prevent internal control module damage.
   • Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.
   • In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.
   • Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets when diagnosing or replacing the control module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.
   • The replacement control module must be programmed.

Important: Before removing the engine control module (ECM), use the scan tool to capture the ECM data. This captured data will then need to be restored into the NEW ECM. Refer to Control Module References .

Removal Procedure

  1. Using a scan tool, capture the ECM data.
  2. Open the hood.
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  4. Disconnect wiring harness connectors at the ECM.

  5. Object Number: 1395856  Size: SH
  6. Pull back the ECM bracket tabs and remove the ECM.
  7. If the ECM bracket requires removal, perform the following:
  8. 6.1. Remove accumulator bottle bracket retaining nuts and position bottle out of the way.

    Object Number: 1394896  Size: SH
    6.2. Remove the 2 ECM bracket bolts and the ECM bracket with the ECM from the multi-use bracket.

Installation Procedure

Notice: Refer to Fastener Notice in the Preface section.

  1. If the ECM bracket was removed, perform the following:

  2. Object Number: 808153  Size: SH
    1.1. Position the multi-use bracket tray in the multi-use bracket and secure with tray bolts.

    Tighten
    Tighten the bolts to 9 N·m (80 lb in).

    1.2. Reposition the accumulator bottle in the accumulator bottle bracket.
    1.3. Install the accumulator bottle to the accumulator bottle bracket studs with nuts.

    Tighten
    Tighten the nuts to 9 N·m (80 lb in).


    Object Number: 1395856  Size: SH
  3. Install the ECM to the ECM bracket.
  4. Connect the electrical wiring harness to the engine control module bracket.
  5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  6. If a new ECM is installed, program the ECM. Refer to Control Module References .
  7. Perform the turbocharger learn procedure. Refer to Turbocharger Learn .