FixVault
Home › Chevrolet › 2006 › Cutaway 6.6 2 › Repair and Diagnosis › Engine Performance › System › Engine Control System - 6.6L (LLY) - Introduction (2 Of 2) › Repair Instructions › Engine Control Module (ECM) Replacement › Removal Procedure

Removal Procedure

IMPORTANT:
  • To prevent internal ECM damage, the ignition switch must be OFF when disconnecting or connecting power to the ECM.
  • Remove any debris from the ECM connector surfaces before servicing the ECM. Inspect the ECM module connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the ECM.
  • The replacement ECM must programmed.
IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement module is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement module is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5 000 km (3,000 mi) from the last engine oil change.
    Fig 1: ECM Electrical Connectors
    GM1612203Courtesy of GENERAL MOTORS CORP.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure .
    3. Fig 2: Washer Solvent Container Bolt
    GM1655949Courtesy of GENERAL MOTORS CORP.
  3. Remove the washer solvent container bolt.
    4. Fig 3: Washer Solvent Pump Connector
    GM1655946Courtesy of GENERAL MOTORS CORP.
  4. Remove the washer solvent pump connectors.
    5. Fig 4: Washer Solvent Container
    GM1655951Courtesy of GENERAL MOTORS CORP.
  5. Remove the washer solvent container.
    6. Fig 5: ECM Electrical Connector
    GM1655955Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the ECM electrical connectors.
    7. Fig 6: ECM Upper Retaining Tabs
    GM1655954Courtesy of GENERAL MOTORS CORP.
  7. Release the ECM upper retaining tabs.
  8. Remove the ECM from the bracket.
About FixVault