DeVille, Eldorado, Seville 1999-2005

Powertrain Control Module

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Operation



The top-feed fuel injector assembly is a solenoid operated device, controlled by the PCM, that meters pressurized fuel to a single engine cylinder. The PCM energizes the injector solenoid, which opens a ball valve, allowing fuel to flow past the ball valve, and through a recessed flow director plate. The director plate has multiple machined holes that control the fuel flow, generating a conical spray pattern of finely atomized fuel at the injector tip. Fuel is directed at the intake valve, causing it to become further atomized and vaporized before entering the combustion chamber. An injector stuck partly open can cause a loss of pressure after engine shutdown. Consequently, long cranking times would be noticed on some engines.

Removal & Installation




NOTE
It is necessary to record the remaining engine oil life and/or ATF life. If the replacement module is not programmed with the remaining oil life, the oil life reading will default to 100%. If the replacement module is not programmed with the remaining oil life, the fluids will need to be changed at 3,000 miles (engine oil) or 50,000 miles (ATF) from the last fluid change.


CAUTION
Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF , unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

  1. Using a scan tool, retrieve the percentage of remaining engine oil and the remaining automatic transmission fluid life. Record the remaining engine oil and the remaining automatic transmission fluid life.
  2.  
  3. Turn OFF the ignition.
  4.  
  5. Disconnect the negative battery cable.
  6.  
  7. Remove the screw retaining the intake air duct/resonator (3) to the PCM housing.
  8.  
  9. Unsnap the air filter housing clamps on top of the air cleaner housing assembly.
  10.  
  11. Pull the intake air duct/resonator assembly (2) up enough to remove the air cleaner cover (3) and the PCM.
  12.  
  13. Slide the air cleaner element assembly toward the fender to separate the air cleaner element assembly from the air inlet assembly.

    Click image to see an enlarged view

    Fig. Removing the intake air duct/resonator



    Click image to see an enlarged view

    Fig. Removing the air cleaner cover (3)

  14.  
  15. Loosen the PCM connector attaching bolts.
  16.  
  17. Disconnect both PCM connectors.
  18.  
  19. Remove the PCM (1).
    NOTE
    If the PCM is being programmed using the Off-Board method, perform the programming before continuing with the steps listed below. Refer to the Off-Board procedure in Powertrain Control Module (PCM) Programming.



    Click image to see an enlarged view

    Fig. Removing the PCM (1)

  20.  

To install:

  1. Install the PCM (1).
  2.  
  3. Install the PCM connectors. Tighten the PCM connectors screws to 8 Nm (71 inch lbs.).
  4.  
  5. Install the air cleaner cover (3) onto the air inlet housing.
  6.  
  7. Snap the assembly clamps into place.
  8.  
  9. Align the intake air duct/resonator assembly (3) into place.
  10.  
  11. Install the screw onto the intake air duct/resonator assembly.
  12.  
  13. Tighten the intake air duct clamp to 3 Nm (27 inch lbs.).
  14.  
  15. Connect the negative battery cable.
  16.  

 
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