ES300 1992-1997

Electronic Control Module

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Location



Specific to:

Lexus ES300 1992-1999



Click image to see an enlarged view

Fig. Electronic Control Module (ECM)-1992-96 models



Click image to see an enlarged view

Fig. Electronic Control Module (ECM)-1997-99 models

Operation



Specific to:

Lexus ES300 1992-1999

The ECM controls all engine computer related functions.

Removal & Installation



Specific to:

Lexus ES300 1992-1993

  1. Before servicing the vehicle, refer to the Precautions Section.
    CAUTION
    Before servicing components near or affected by the SRS (air bag) system, read and observe all SRS Service Precautions. Refer to Supplemental Restraint System (SRS), in the Chassis Electrical section. Failure to observe all precautions may result in accidental airbag deployment, personal injury, or death.

  2.  
  3. Disconnect the negative battery cable and wait at least 3 minutes for the SRS memory to drain.
  4.  
  5. Remove glove compartment. Refer to Instrument Panel Removal & Installation in the Body Interior section.
  6.  
  7. Remove the ECU and bracket:
    1. Remove the 3 nuts and the ECU bracket.

      Click image to see an enlarged view

      Fig. Remove the ECU and bracket

    2.  

  8.  

To install:

  1. Installation is the reverse of removal.
  2.  

Specific to:

Lexus ES300 1994-1996

  1. Before servicing the vehicle, refer to the Precautions Section.
    CAUTION
    Before servicing components near or affected by the SRS (air bag) system, read and observe all SRS Service Precautions. Refer to Supplemental Restraint System (SRS), in the Chassis Electrical section. Failure to observe all precautions may result in accidental airbag deployment, personal injury, or death.

  2.  
  3. Disconnect the negative battery cable and wait at least 3 minutes for the SRS memory to drain.
  4.  
  5. Remove glove compartment.
  6.  
  7. Remove the 2 nuts and the No. 6 relay block.

    Click image to see an enlarged view

    Fig. Remove the No. 6 relay block

  8.  
  9. Remove the screw, the clip and the heater to register No. 4.

    Click image to see an enlarged view

    Fig. Remove the heater to register No. 4

  10.  
  11. Remove the ECU and bracket:
    1. Remove the 3 nuts and the ECU bracket.

      Click image to see an enlarged view

      Fig. Remove the ECU and bracket-1994-96 models

    2.  

  12.  

To install:

  1. Installation is the reverse of removal.
  2.  

Specific to:

Lexus ES300 1997-1999

  1. Before servicing the vehicle, refer to the Precautions Section.
    CAUTION
    Before servicing components near or affected by the SRS (air bag) system, read and observe all SRS Service Precautions. Refer to Supplemental Restraint System (SRS), in the Chassis Electrical section. Failure to observe all precautions may result in accidental airbag deployment, personal injury, or death.

  2.  
  3. Disconnect the negative battery cable and wait at least 3 minutes for the SRS memory to drain.
  4.  
  5. Remove the right-hand cowl side trim.
  6.  
  7. Remove the right-hand front door scuff inside plate.
  8.  
  9. Remove the No. 2 panel under cover. Refer to Instrument Panel Removal & Installation in the Body Interior section.
  10.  
  11. Remove the lower finish panel.
  12.  
  13. Remove the ECM:
  14.  
  15. Disconnect the connectors.
  16.  
  17. Remove the 2 nuts and ECM.

    Click image to see an enlarged view

    Fig. ECM removal

  18.  

To install:

  1. Installation is the reverse of removal.
  2.  

 
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