RX300 1999

Positive Crankcase Ventilation System

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PCV Valve



Operation

Specific to:

Lexus RX300 1999-2003

Lexus RX330 2004-2006

The PCV system consists of the breather tube and the PCV valve. The breather tube connects the crankcase to a contained fresh air source such as the air cleaner. Air passes into this tube and into the engine after being filtered through a spark arrestor screen in order to prevent a the possibility of an explosion within the engine in the case of a backfire.

Removal & Installation

Specific to:

Lexus RX300 1999-2003

At this time the manufacturer does not provide removal and installation procedures for this component. The following procedure is a guideline and may differ from the vehicle you are servicing.

  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    If working near and/or around the SRS system and components, be sure to disable the SRS system.

  2.  
  3. Disconnect the negative battery cable.
    NOTE
    When disconnecting the cable be sure that the ignition switch and headlight switches are off.


    NOTE
    When disconnecting the cable, certain systems will have to be initialized after reconnecting the cable. These systems are adaptive front lighting system, power window control system, power back door system, SRS system, audio system, sliding roof system and certain DTC codes. Be sure to write down any important information before disconnecting the cable. The Toyota scan tool, or equivalent, must be used. Follow the directions on the appropriate scan tool to complete initialization procedure.

  4.  
  5. Remove the necessary components in order to gain access to the valve.
  6.  
  7. Disconnect the hose from the valve.
  8.  
  9. Remove the valve from its mounting.

    Click image to see an enlarged view

    Fig. PCV valve and related components-RX300

  10.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. Installation is the reverse of the removal procedure.
  2.  

Testing

Specific to:

Lexus RX300 1999-2003

Lexus RX330 2004-2006

Inspect the PCV valve hose for cracks and leaks, replace if defective. Blow air thru both ports of the valve. If a good steady stream of air is not felt, replace the valve.

 
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