Question about 2003 Lexus Gs 300

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OBD code P0746. Where is the Pressure Control

OBD code P0746. Where is the Pressure Control Solenoid located and what does it look like on a 2003 Lexus ES300? Also P0446 Evap control system vent check malfunction. What is the vent check and what does that look like?

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  • yadayada
    yadayada May 12, 2010

    it is located inside the tranmission

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P0746 Pressure Control Solenoid Performance or Stuck Off
A transmission solenoid is an electro-hydraulic valve that controls fluid flow into and throughout an automatic transmission. Solenoids can be normally open or normally closed. They operate via a voltage or current supplied via the transmission computer or controller. Transmission solenoids are usually installed in a Transmission Valve body, Transmission Control Unit, Transmission Control Module or inside the Transmission and it helps regulate the pressure from the trans fluid pump.


P0446 Evaporative Emmission Control System Vent Control Circuit Malfunction

What does that mean?
Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.

Symptoms
There will be no obvious symptoms to driver, other than MIL illumination.

Causes
A code P0446 could mean one or more of the following has happened:
* Faulty vent valve
* Open, short or excessive resistance on Vent valve control circuit
* Blockage of vent valve
* Bad PCM

Possible Solutions
With a P0446 OBD-II trouble code, here are some things to try:
* Replace Vent valve
* Repair open, short, or resistance problem in control circuit
* Repair open, or short, or resistance problem in power circuit
* Replace PCM


Hope this help (remember rated this post).

Posted on May 12, 2010

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  • Lexus Master
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ITS ON THE INSIDE TRANSMISSION ON THE VALVE BODY.YOU NEED A TRANSMISSION MANUAL FOR THAT TRANSMISSION.IT HAS MORE THAN ONE SOLENOID.IT WOULD BE THE EVAP CANISTER REAR THE CROSSMEMBER NEAR THE FUEL TANK.ALSO CHECK THE VACUUM SWITCHING VALVE.VACUUM HOSES MAKE SURE NONE LOOSEN OR MISSING ALSO.IT COULD BE FAULTY. ITS LOCATION NEAR THE EXHAUST MANIFOLD AND ON THE AIR INTAKE HOSE. IT WOULD BE BEST FOR DEALERSHIP FIX BECAUSE THEY HAVE DIAGNOSTIC EQUIPMENT TO SCAN THE EMISSION SYSTEM LIKE THE FUEL TANK VAPOR PRESSURE SENSOR.IT WOULD BE CHEAPER TO HAVE SCANNED AT DEALERSHIP YOU WILL SPEND TOO MUCH GUESSING YOU HAVE MORE COMPONENTS IN THE EVAP SYSTEM THE SCANNER WILL FIND PROBLEM QUICKER.

Posted on May 12, 2010

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Tech notes
When the a transmission solenoid is malfunction, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is very dirty, it is recommend changing the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a transmission mechanical failure and that the transmission will need to be rebuilt or replaced.
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