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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 >> Installation Procedure
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Installation Procedure

IMPORTANT: Inspect the following areas prior to installing the ECM:
  • No debris in the air filter/ECM housing assembly, or the MAF/IAT sensor inlet screen that may distort the air flow.
  • No signs of damage to the air filter/ECM housing assembly, or the intake air duct. If a problem is found, replace the components as necessary.
    Fig 1: ECM Harness Electrical Connector
    GM1664479Courtesy of GENERAL MOTORS CORP.
  1. Install the ECM to the lower air cleaner housing.
  2. Install the engine harness electrical connectors to the ECM.
  3. Engage the engine harness electrical connector lever locks at the ECM.
    4. Fig 2: Air Cleaner Upper Housing
    GM1670787Courtesy of GENERAL MOTORS CORP.
  4. Install the air cleaner upper housing.
  5. Engage the upper housing front tabs to the lower housing.
  6. Engage the lower housing clips (1).
    7. Fig 3: Air Cleaner Outlet Duct
    GM1670790Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Properly install the air cleaner outlet duct to the throttle body. An improperly installed, distorted, or damaged air duct may cause a DTC to set.
  7. Install the air cleaner outlet duct to the throttle body.
    8. NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Tighten the air cleaner outlet duct clamp at the throttle body.

    Tighten:  Tighten the clamp to 3 N.m (27 lb in).

    9. Fig 4: AIR Pump Inlet Tube
    GM1665331Courtesy of GENERAL MOTORS CORP.
  9. Connect the AIR pump inlet tube quick connect fitting to the air cleaner upper housing. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    10. Fig 5: PCV Fresh Air Tube
    GM1661022Courtesy of GENERAL MOTORS CORP.
  10. Connect the PCV fresh air tube quick connect fitting to the air duct. Refer to Quick Connect Fitting(s) Service (Plastic Collar) .
    11. Fig 6: MAF/IAT Sensor
    GM1670786Courtesy of GENERAL MOTORS CORP.
  11. Connect the engine harness electrical connector to the MAF/IAT sensor.
  12. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure .
  13. Program the PCM. Refer to Control Module References .
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