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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (LSY) - Repair Instructions >> Repair Instructions >> Engine Control Module Replacement >> Removal Procedure

Removal Procedure

    WARNING:

    Refer to Safety Glasses Warning .

    CAUTION:

    Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

    CAUTION:
    • 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.
  1. Before removing the engine control module (ECM), record the oil life percentage remaining.
  2. Disconnect the negative battery cable. Battery Negative Cable Disconnection and Connection
  3. GM5750689Courtesy of GENERAL MOTORS COMPANY

    Ground Cable Bolt (1) - Remove @ Upper Core Support

  4. GM5750722Courtesy of GENERAL MOTORS COMPANY

    Body Wiring Harness Junction Block Bracket Bolt (1) - Remove [2x]

  5. Body Wiring Harness Junction Block Bracket (2) & Fuse Block - Reposition
  6. GM5415995Courtesy of GENERAL MOTORS COMPANY

    Disconnect the 3 electrical connectors (1) from the engine control module.

  7. Disconnect engine control module electrical connector wire harness retainer at engine control module bracket and position harness out of the way.
  8. Use a suitable tool to pry back the locking tab (2) and remove the engine control module from the bracket.
    GM5403399Courtesy of GENERAL MOTORS COMPANY
  9. Engine Control Module (1) - Remove
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