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About Mihanicos

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  • Lexus Model
    GS 450H
  • Year of Lexus
  • UK/Ireland Location
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    Classic Cars
    General Automotive
    Car Restoration

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  1. 2001 GS 430 cut out and wont start

    Assuming that the scanner could read all the codes, this eliminates any malfunction of the car. The only variable that can fail to start a petrol engine is the fuel. I strongly suspect that somebody put diesel fuel in the car and not petrol. The mechanic mentioned that the fuel had a peculiar smell and taste. Take a sample of the fuel for analysis or simply drain it and try again with petrol. It will struggle to start until the fuel lines are cleared from the existing fuel.
  2. Merry Christmas to all. Not all trouble codes are displayed on the instrument panel. To eliminate all guess work, I would use the Techstream scanner, the Mongoose or the one used by Lexus. Intermitent faults usually indicate bad contacts at the connectors. By removing and reconnecting the connectors a good contact is restored. Never believe that anything in this real world lasts for life! My car's owner's manual states that the gearbox is sealed for life and no maintenance is required. However if you refer to Techdoc ( Lexus repair manual ) it specifies that the gearbox oil should be changed every 72 months or some 60 000 miles, I am not quite sure of the mileage but is around there. Refer to Techdoc for your car and follow the directives. I would most certainly change the oil with the recommended oil by the manufacturer and not by any other claimed to be superior, better etc. I would also disonnect and reconnect all connectors to the gearbox. Also check any damage to the multicore cables pertaning to the gearbox and repair as necessary. Moisture and water is the cause of all electrical and electronic equippment. Kindest regards, Chris.
  3. GS450h - dead hybrid battery?

    From personal experience, every time I go abroad for three continuous months my car starts every time first time. If the 12v battery is flat, all it needs is charging and then the car starts. In your case, it is possible that the HV battery is not charged properly or, there is a current leak from the HV battery to the ground. This would indicate damaged HV cables from the battery to the inverter converter and from the gearbox. Testing the battery power output will eliminate the remote possibility of being damaged. A techstream scan would be a great help. Normally a visual inspection of the orange cables underneath the car running from the HV battery and the gearbox to the engine compartment will show any damage to the cables. To carry out the foregoing you must be competent with electricity. You also need the right equipment to do it. If you need more information and precise details how to locate the fault, I will be more than happy to help you. Kindest regards, Chris.
  4. Wobbles at speed - ball joints?

    I agree with the recommendations of all other members. Tire unbalance usually occurs between 50 and 60 mph. But if there is a steering damper fitted on the car, probably this will not be noticed. Check that the steel belting of the tires is sound and not ruptured. Jack each wheel up and rotate them. Make sure that there are no bulges anywhere on the tire and that its circumference is fairly true. With time and increased mileage there will be a noticeable wear of the rubber at the bulge points. This will not be visible at the beginning. Taking advantage of this opportunity, check that there is no play at all on the bearings of each wheel. Regards, Chris
  5. Transmission fluid change

    You are absolutely right! I stand corrected. I apologise for the wrong information. Chris.
  6. Transmission fluid change

    This ecvt gearbox has a filter in it and it is made of a fine steel mesh. Given that the owner's manual states that the transmission fluid needs no change and the Techdoc maintenance schedule calls for transmission fluid change only and not the filter as well, then this should suffice. I have another Toyota with automatic transmission and I changed the filter as well as the fluid. I bought the filter before I removed the transmission pan and both were made of a fine steel mesh, exactly like the one for Lexus. The car had done 150 000 Km and the filter was clean and there was no difference between the new one and the old one. I put the new one in and there is no difference in the transmission performance. With this in mind, I opted out not to change the filter on the Lexus for now. The ecvt transmission is not like a conventional automatic transmission with clutches. Regards, Chris.
  7. Transmission fluid change

    In the owner's manual it is stated that the gearbox is sealed and the fluid is intended to last the car's expected lifetime. However, if you look up the maintenance and service schedule in the Lexus Techdoc, depending on the region the car is being driven, you will find all the relevant details. In my case, it needs a transmission fluid change every 72 months or 70 000 Km ( I am not quite sure about the Km but it is not far off there ). I had 42 000 miles on the clock and the oil that came out began to change colour, pale red. I also found out that it had less oil than the right amount, somebody attempted to check the fluid level without first circulating the fluid through all the gears and probably at a higher temperature than 40C. The 5mm allen key plug which is removed to check the fluid level was very tight whereas the 14mm drain plug was at specified torque. This a clear indication of what had happened. Now with the correct amount of new transmission fluid it operates like before and when braking down hills, all the gears hold the car very well with constant braking, the position of needle of the Kw meter remains constant in the blue range corresponding to each gear being used. Bear in mind that in an ecvt hybrid gearbox the electric motors MG1 and MG2 generate a lot of heat when in traction or generating mode. The transmission fluid is intended to cool them and lubricate the bearings. Channels and pipes within the gearbox make sure that the windings of the motors get a constant supply of oil to cool them. Kindest regards, Chris.
  8. Transmission fluid change

    Dear Hangie, Thank you very much for reply. I changed the transmission fluid myself according to the guidelines in the relevant Techdoc publication. It was not difficult but if you need to add fluid, you have to disconnect the rubber hose connecting the oil pipe to the oil cooler, adjacent to the gearbox. Had it been a filler plug available like in other models, you simply add fluid at a temperature between 30 C and 40 C it trickles from the drain plug. In the Techdoc publication it is over stressed in every step of the guidelines in red letters to make sure that you have no line pressure in the fluid filling process. I had had no line pressure DTC so everything was ok. To do this job you need the Techstream. Kindest regards, Chris.
  9. Hi everybody, my car is due for a transmission fluid change and I cannot find the filler plug. I looked everywhere except on the top of the transmission which is impossible from underneath the car. The Lexus Techdoc suggests to disconnect a small rubber hose about one foot from the gearbox on the fluid line to the oil cooler and fill the transmission from there. There has to be a fluid filler plug because without that, the fluid level cannot be adjusted if its temperature is not within the 30 C to 40 C range. A special tools is connected to the filler plug to to add fluid or apply vacuum so no fluid drains from the pan when the drain plug is removed in order to connect to it another special tool which compensates for the fluid level at higher temperatures.
  10. Gs300 Transmission Filter Change

    You can use either. You can also use the old gasket by applying a gasket sealant on top of it if it is still stuck to the pan or on both sides if it is free. Make sure that the gasket sealant you apply is compatible with the gasket material.
  11. Normally, faults that bear no relation to each other, for a specific code, point to bad ground connections. Trouble codes that are cleared and return immediately are permanent indicating short or open circuits relevant to the code in question. At this instance, I would make certain that all ground connectons have an almost zero resistance to the 12v battery negative terminal. A ground connection wire is connected to all the car's Ecu and you must find it and check itq. A 5v reference voltage is established at the car's circuit which is used for signal purposes and data collection from the various sensors. Each Ecu sends and receives 5v pulses for various purposes. Make sure this reference voltage is available and stabilised. Refer to the circuit diagrams of the car to identify the ground, 5v reference voltage and all relevant sensors qwiring connections pertaining to the codes in question. Sometimes by pulling out the multipin connectors to the various Ecu and reconnecting them will improve contact resistance. Good luck!
  12. Remove the connectors to both rear wheel sensors and with a multimeter check their continuity and insulation to ground. You should get very nearly the same readings. If not the replaced sensor is faulty. With the ignition ON and the engine OFF, check the voltage readings of each wire on the connectors to the sensors. You should get identical readings, these wires come from the ABS ECU of the car. Check also that you have no fuses blown relating to the ABS ECU . Check that these readings are also available on the pins of each connector to eliminate the possibility of an open circuit at the connector. It is very likely that you have an open circuit at the connector which occurred when the ABS sensor was damaged. The linear valve offset can be recalibrated with the Techstream or another good scanner like the Autoenginuity. It takes a few minutes and the scan tool will do it without any intervention from you. Regards, Chris
  13. GS 450H 2011 CVT gearbox

    Thank you very much indeed for sharing your knowledge and experience with me. Your threads were very enlightening and the videos explained very clearly in detail how everything works. I knew that the braking was regenerative through the motors but I did not have a full drawing of the car's gearbox to understand how everything works. I bought viewing time from Lexus website to look up relevant information but all I could access was how to change gearbox oil. I will check the car's behaviour in the next few days and I will know if it is back to normal. I take this opportunity to thank you for your help and the Lexus owners club of uk for hosting me. Chris.
  14. Recently when going down mountain roads with gradients in excess of 10% I noticed that the engine braking when in 5th, 4th and 3rd gears was much less than before. The difference in braking between these gears was also very small. The car displayed no trouble codes and neither the Techstream. There has been no loss of transmission fluid. The 12v battery has gone flat a couple of occasions due to absence abroad but the car was ok after recharging the battery. The only items to initialize after reconnecting the battery was the steering by turning it fully in both directions and the tyre pressure sensors. I would be grateful if anybody can give any advise as to the cause of the problem. Chris.
  15. Make certain that you have no ignition issue. If you have HT leads to the spark plugs, check their insulation. An easy way is to look at them at night with the engine running. If you see flashing from any HT cable to anything that is grounded then the insulation is poor. If you have a fuel filter, replace it. Check that you have no damaged vacuum tubes on the engine. Move them and bend them a little and listen for any effect while the engine is running. Failing all the foregoing, rough idling is a clear sign that you have burnt valves or sealing problems with the combustion chamber of any cylinder. You have to remove the cylinder head to find out the cause. If you need any further help, contact me. Regards, Chris.