Haynes Repair Manual for Toyota Highlander 2001 thru 2007 and Lexus RX 300/330 1999 thru 2006 Does not include information specific to hybrid models Logo

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isere charles Posted on Apr 28, 2015
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Can a faulty brainbox affect the performance of the transmission in a lexus rx300 2001 model?

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charles

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  • Posted on Apr 28, 2015
charles
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0helpful
1answer

My 1993 Ford Explorer XLT automatic is shifting slowly and sluggishly what may be the problem

A slow and sluggish shift in an automatic transmission can be caused by a variety of issues. Here are some potential causes to consider:
  1. Low Transmission Fluid: A common cause of sluggish shifting is low transmission fluid. Check the fluid level and condition, and top it up or replace it if necessary. Low fluid levels can also indicate a leak in the system.
  2. Worn Transmission Filter: Over time, the transmission filter can become clogged with debris and dirt, which can hinder the flow of fluid and affect the performance of the transmission. Replacing the transmission filter may help improve shifting performance.
  3. Faulty Shift Solenoids: The shift solenoids are responsible for controlling the flow of transmission fluid through the valve body, and if they are damaged or malfunctioning, it can cause slow or sluggish shifting. A professional mechanic can diagnose and replace any faulty shift solenoids.
  4. Malfunctioning Torque Converter: The torque converter is responsible for transferring power from the engine to the transmission, and if it is malfunctioning, it can cause slow and sluggish shifting. A professional mechanic can diagnose and replace any faulty torque converter.
  5. Worn Clutch Plates or Bands: Over time, the clutch plates or bands in the transmission can wear down, causing poor shifting performance. Rebuilding or replacing the transmission may be necessary to resolve this issue.
It's important to have a qualified mechanic diagnose the issue with your Ford Explorer to accurately determine the cause of the slow and sluggish shifting. They can then recommend the appropriate repairs or maintenance to improve the transmission's performance.
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2005 model 650. It idles OK but why does it lose power when I get (to) about 1/4 throttle and only gets to 50 mph?

If your 2005 model 650 motorcycle is experiencing a loss of power and struggles to go beyond 50 mph when you reach about 1/4 throttle, there could be several potential reasons for this issue. It's important to identify the underlying problem to resolve the performance concern. Here are some common causes to consider:
  1. Fuel System Issues: Insufficient fuel supply or a clogged fuel filter can restrict the flow of fuel to the engine, leading to a loss of power. Check the fuel filter, fuel pump, and ensure the fuel lines are clear and not kinked.
  2. Air Intake Blockage: A blocked air filter or a clogged air intake system can limit the amount of air entering the engine, affecting its performance. Clean or replace the air filter as necessary.
  3. Carburetor Problems: If your motorcycle is equipped with a carburetor, issues such as a stuck float, clogged jets, or incorrect adjustments can lead to poor performance. Cleaning and tuning the carburetor might be necessary.
  4. Ignition System Issues: Faulty spark plugs, ignition coils, or ignition timing problems can result in incomplete combustion, leading to a loss of power. Check and replace any faulty ignition components.
  5. Exhaust System Blockage: A restricted exhaust system, such as a clogged or damaged muffler, can impede the flow of exhaust gases, affecting engine performance.
  6. Engine Compression: Low engine compression due to worn piston rings or cylinder head gasket leaks can reduce engine power. A compression test can help diagnose this issue.
  7. Throttle or Choke Cable Problems: A misadjusted or sticking throttle or choke cable can affect the fuel-air mixture and throttle response. Ensure that the cables are properly adjusted and move freely.
  8. Electrical Issues: Faulty sensors, wiring problems, or issues with the electronic control unit (ECU) can impact engine performance. A diagnostic scan might be required to identify electrical problems accurately.
  9. Valve Clearance: Incorrect valve clearance can affect engine performance. Ensure the valve clearance is within the manufacturer's specifications.
  10. Transmission or Clutch Problems: Issues with the transmission or clutch can result in power loss and limited top speed. Inspect and service the transmission and clutch components.
It's essential to perform a systematic inspection and troubleshooting process to pinpoint the exact cause of the problem. If you are unsure about diagnosing or fixing the issue yourself, it's recommended to seek the assistance of a qualified motorcycle mechanic or dealership. They have the expertise and tools to diagnose and repair the problem effectively.
0helpful
2answers

Can a weak brainbox cause fuel to be mixed with engine oil

Why do you think there is fuel in the oil? Does it smell like it? Or is the dipstick level climbing? Tell us more about the problem and what you have already tried/done. When was the car last fully serviced? Poor maintenance is no excuse for poor running.
0helpful
1answer

We recently had a different transmission put in our 1991 plymouth voyager and it still droped down to first and then a new brainbox it still drops to first what else could it be some one was saying wo

replace the input and output turbine sensors,its a common problem with those transmissions,they both screw in to the front of the transmission,yopu should be able to get them at any parts store
0helpful
1answer

My brainbox was stolen and i want a perfect replacement for it

You might need to get a hold of your Lexus dealer, I know some companies set the ECU to the VIN # of the vehicle to try and prevent the selling of stolen parts. If this is the case with your Lexus then you will need to have the used ECU flashed to your VIN # before it will work properly, or you might even need to replace with a new unit.
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Code p0330 knock sensor does this affect the way it shifts if engine light is on

Possible but unlikely. Code p0330 refers to knock sensor(KS) 2 bank 2-circuit malfunction==causes --wiring --KS--ECM. Replace the KS. The engine light is telling you that there is a problem with sensors in the ECM and that is what will be affecting the performance . Shifting is the area of the TCM( transmission control module ) so have that checked out as well
0helpful
1answer

How can I fix my ******?

You may be able to get a readout on some scanners to diagnose the servo solenoids and brainbox for your truck. You may also have problems with the Torque converter that is affecting the trans.

About all you can do is change the trans filter and fluid, and with a measure of difficulty, the shift solenoids and perhaps a Vacuum control. If pressure readings are taken externally, some diagnosis is possible.

Have to truck towed to a place for diagnosis if it is not driveable. If a place tells you they will not know until the trans is bench checked, this is largely true.

There are 2 ways to fix a trans. Complete rebuild or replace only worn parts.

In conclusion, the Electronics can adversely affect the performance of the trans. A part called a PCM adjusts trans shifts and it can be reprogrammed for proper performance. You need a diagnosis.

Please rate my info.
0helpful
1answer

Lexus rx330 check engine with vsc light

Hello, these lights being on indicate a fault that affect both vehicle stability control and engine performance. In some cases, it could be a transmission related concern, but not in all.

However this can be very helpful

Make sure you are completely stopped. Put the car in park if you can.
Press and hold the VSC button for a few seconds.
The TRAC OFF and VSC OFF indicator light will come on. Both systems are now off.
Press the VSC button again. Both lights will turn off and the systems are now reengaged.

You can also check this out if you are having any problems with your smart key
0helpful
1answer

Lexus rx300,2001, how to change knock sensor#2? where is knock sensor#2?

some are on the cylinder head or on the side of block . they screw in .
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