Sienna 1998-1999

Electronic Control Module

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Operation



Specific to:

Toyota Sienna 1998-2005

The powertrain has electronic controls to reduce exhaust emissions while maintaining excellent driveability and fuel economy. The Engine Control Module (ECM) is the control center of this system. The ECM monitors numerous engine and vehicle functions. The ECM constantly monitors the information from various sensors and other inputs, and controls the systems that affect vehicle performance and emissions.

The ECM also performs the diagnostic tests on various parts of the system. The ECM can recognize operational problems and alert the driver via the Malfunction Indicator Lamp (MIL). When the ECM detects a malfunction, the ECM stores a Diagnostic Trouble Code (DTC). The problem area is identified by the particular DTC that is set. The control module supplies a buffered voltage to various sensors and switches. Review the components and wiring diagrams in order to determine which systems are controlled by the ECM.

Removal & Installation



Specific to:

Toyota Sienna 1998-2005

  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Disconnect battery negative terminal.
  4.  
  5. Remove glove compartment door.
  6.  
  7. Remove the cowl side trim and scuff plate.
  8.  
  9. Disconnect the ECM connectors .
  10.  
  11. Remove ECM.

    Click image to see an enlarged view

    Fig. ECM location-3.0L engine



    Click image to see an enlarged view

    Fig. ECM location -3.3L engine

  12.  

To install:

  1. Install the ECM and tighten to 69 inch lbs. (8 Nm).
  2.  
  3. Connect the ECM connectors.
  4.  
  5. Clear any trouble codes that were set.
  6.  

 
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