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Home >> Buick >> 2005 >> Rendezvous Ultra, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.6L - Introduction >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Removal Procedure

Removal Procedure

NOTE: Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.
    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 percent. 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.
  1. Using a scan tool, retrieve the percentage of remaining engine oil. Record the remaining engine oil life.
    2. Fig 1: ECM Electrical Connector Lever Lock & Lock Slide
    GM1285259Courtesy of GENERAL MOTORS CORP.
  2. Turn the ignition OFF.
    3. IMPORTANT: Ensure that there is no main relay circuit voltage (ECM Fuse).
  3. Use a DVOM in order to measure the main relay circuit voltage at the engine control module (ECM) fuse in the underhood fuse block. Refer to Electrical Center Identification Views in Wiring Systems.
  4. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (LA1) in Engine Electrical.
  5. Remove the ECM fuse in the underhood fuse block. Refer to Electrical Center Identification Views in Wiring Systems.
  6. Remove the TCM/IPC fuse in the underhood fuse block. Refer to Electrical Center Identification Views in Wiring Systems.
  7. Remove the ECM/TCM fuse in the underhood fuse block. Refer to Electrical Center Identification Views in Wiring Systems.
  8. Unlock the body side (outboard) ECM electrical connector.
    1. Depress the ECM electrical connector lever lock (1).
    2. Simultaneously rotate the ECM connector clamp lever and depress the lock slide (2).
    9. NOTE: In order to prevent any possible electrostatic discharge damage to the ECM, do not touch the connector pins.
    Fig 2: Identifying Engine Control Module Side Electrical Connector
    GM1394047Courtesy of GENERAL MOTORS CORP.
  9. Remove the body side (outboard) ECM connector.
    10. Fig 3: Locating Engine Side (Inboard) ECM Connector
    GM1394046Courtesy of GENERAL MOTORS CORP.
  10. Unlock and remove the engine side (inboard) ECM connector.
    11. Fig 4: Identifying ECM Redundant Ground Wire And Bolt
    GM1394045Courtesy of GENERAL MOTORS CORP.
  11. Remove the ECM redundant ground wire and bolt from the ECM.
    12. Fig 5: View Of ECM Bolts
    GM1394049Courtesy of GENERAL MOTORS CORP.
  12. Remove the ECM bolts.
  13. Remove the ECM.
    14. Fig 6: Locating ECM Bracket & Bolts
    GM1394048Courtesy of GENERAL MOTORS CORP.
  14. If necessary, perform the following steps:
    1. Remove the ECM bracket bolts.
    2. Remove the ECM bracket (1).
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