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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - Introduction (2 Of 2) >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Removal Procedure
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Removal Procedure

IMPORTANT: It is necessary to record the remaining engine oil life. If the replacement engine control module (ECM) is not programed with the remaining engine oil life, the engine oil life will default to 100%. If the replacement ECM is not programmed with the remaining engine oil life, the engine oil will need to be changed at 5000 km (3,000 mi) from the last oil change.
IMPORTANT: It is necessary to record the remaining automatic transaxle fluid life. If the replacement ECM is not programed with the remaining transaxle fluid life, the transaxle fluid life will default to 100%. If the replacement ECM is not programmed with the remaining transaxle fluid life, the transaxle fluid will need to be changed at 83000 km (50,000 mi) from the last transaxle fluid change.
  1. Using a scan tool, retrieve the percentage of remaining engine oil and automatic transaxle fluid life. Record the remaining engine oil and transaxle fluid life.
  2. Ensure that the ignition is in the OFF position.
  3. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure .
    4. Fig 1: MAF/IAT Sensor
    GM1670786Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the engine harness electrical connector from the mass air flow/intake air temperature (MAF/IAT) sensor.
    5. Fig 2: PCV Fresh Air Tube
    GM1661022Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the positive crankcase ventilation (PCV) fresh air tube quick connect fitting from the air duct. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    6. Fig 3: AIR Pump Inlet Tube
    GM1665331Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the secondary air injection (AIR) pump inlet tube quick connect fitting from the air cleaner upper housing. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    7. Fig 4: Air Cleaner Outlet Duct Clamp
    GM1670790Courtesy of GENERAL MOTORS CORP.
  7. Loosen the air cleaner outlet duct clamp at the throttle body.
  8. Remove the air cleaner outlet duct from the throttle body.
    9. Fig 5: Air Cleaner Upper Housing
    GM1670787Courtesy of GENERAL MOTORS CORP.
  9. Disengage the lower housing clips (1).
  10. Disengage the upper housing front tabs from the lower housing.
  11. Remove the air cleaner upper housing.
    12. Fig 6: ECM Harness Electrical Connector
    GM1664479Courtesy of GENERAL MOTORS CORP.
  12. Disengage the engine harness electrical connector lever locks at the ECM.
  13. Remove the engine harness electrical connectors from the ECM.
  14. Remove the ECM from the air cleaner lower housing.
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