Good Afternoon,

Having issues with the car going 80mph and the Tachometer is on 3. I think there's something goin on with the wiring........the pcm or ecu that's behind the dash has been replaced once........considering they (AAMCO) thought it was the transmission, because it wasnt changing out of 3rd gear so they replaced or rebuilt the transmission and it did the same thing afterwards and after 3 months they figured out it was the pcm.......currently, 3 years later, the speedometer cable broke and it was replaced, and at the same time, the TPS codes popped......they fixed the cable, now the TPS code popped with P0120 Throttle Pedal Position Sesnsor at Switch A Circuit and P0510, Closed TPS. So Ive changed the TPS Twice, it used to thud really hard while changing to 3rd gear and it only changed when I took my foot off the gas. I set the TPS at .045 or .45 at first then I lowered it to .35. Im thinking its not changing into the overdrive gear because when Im driving 80mph, The Tachometer is on 3. Im wondering if the TPS has anything to do with sending the signal to the ECU so it will change into the overdrive gear. What Setting is the TPS sensor supposed to be on if any?

 

Press the overdrive switch does the tach jump up? There is no speedometer cable on this car, so what was replaced? Also verify the speedo with your phone these clusters are known to go bad.

IIRC ~2800 rpm at 80mph is about right, the ES300 has shorter gearing vs. the Camry.

 

Thank you for verifying the RPM. Next time I drive it I will press the Overdrive button to see what it does. If this thing doesnt have a speedometer cable, they surely the **** lied and said thats what they replaced because the plastic gear piece on it was stripped. The ticket said inspect and replace broken speedo gear in VSS housing. No vehicle speed signal to computer. so they ordered the speedo gear and replaced it. but the thing about that is, when I first get in the car and take off, the speedometer does not work for about 2 to 5 mins. Then it will pop up and read the speed! Definieily will look into replacing it if its bad and will verify with phone as well. Another mechanic friend suggested to find a mechanic with one of those expensive scanners and have them reset the transmission adaptive learning.......

 

One more issue im having is the Trunk and gas cap release button! The Trunk side doesnt work. the wire for the trunk side is not getting 12v like the fuel door side! where should I check for a bad component or fuse? ive checked every fuse that Im aware of in the hood and by the drivers side door.

 

Is there a trunk disable button in the glove box?

On your speedometer not working it is likely the cluster itself is bad a common failure on these cars. Another thing to consider is bad capacitors in the ECU. This company does repairs on Lexus clusters not sure if they will do a 1994.
https://taninautoelectronix.com/prod...gnosis-repair/

There is 100% no speedometer cable the speedo itself is powered by a tiny motor that gets pulsed based on the speed sensor in the transmission. You should fix your ABS light as well.

 

I will look for the trunk disable button in the glove box, not sure if it has one or not but I was able to get the trunk / fuel button wiring diagram so I could start tracing wires. or components.

As for the speedometer cluster, I will go take the one off of a 93 ES 300 in LKQ I found up here and see if that helps. The light bulb near the fuel gauge has went out too. Ive taken it out before to replace the dial arms that light up.

So, this car has an ECU and a PCM? or is the ECU the only brain it has? because they replaced that. Not to say that the capacitors inside didnt go bad. Im just asking because ive heard the term PCM and ECU, they are the same thing right or no?

The ABS Light, I have no clue why thats on, is it an issue with the sensors or the module itself? my bluetooth scanner doesnt bring up codes for that.
I can replace the hell out of some parts LOL just gotta figure out where they all are.
I appreciate your help and input on this!! VERY MUCH!!!

 

TRUNK DISABLE BUTTON USER ERROR PUSHER PROBLEM FREAKIN SOLVED LOL!!!!!
Saw the button, pushed it in and WAAAALLAAA the trunk release button works now LOL. GEEEEZZ!!!!!!

 

The engine and transmission are controlled by the same computer commonly knows as ECU or ECM. A single unit. FYI 1994 was the first year of OBD-II (I believe this car was the first ever to have it) which means it is not 100% OBD-II compliant. So some things might not work on your scan tool.

Here is how you check the ABS system

 

In a ES300 with a 3VZ-FE, I can confirm 3000rpm for 80mph is exactly correct when overdrive is activated.

I did a 100km economy measurement run last night on my local freeway and the car still delivers 10.4L/100km - which equates to 27mpg in British gallons.

I presume a well maintained 1MZ-FE engine would be similar to that.

 

Well thats a relief, I appreciate that bit of information but I can guarantee the engine in this one aint gettin 27 MPG LOL I have no clue which engine is in this one but its definitely the original one but I dont know which nomenclature it is, Can you find out with the VIN? JT8GK13T8R0044764 i Just looked up the VIN and it shows that the engine is a 3VZ -FE. so that does really put my mind at ease that the transmission is doing what its supposed to. Its had this leak for a reeeeeaallly long time and Ive tried to get it fixed and it just wasnt where the mechanic thought it was coming from. He changed all the seals in the area thats behind that black cover that covers the timing belt. because it was visually leaking from that spot, He got that leak fixed and its still leaking from somewhere up there and I dont know what other area it could be leaking from like this but this is the best look I could get when i got up under there to take these pics. Any other Ideas of anywhere else it could be coming from above this area?

 

Looks like motor oil to me. Crank and cam seals go after awhile and of course valve cover gaskets. PCV grommet can also leak oil same for the hoses connected to it. The oil pressure sending unit (above the crank pulley) also tends to fail and leak given the leak location going by your pics it could be that. You'll never figure out the source until the engine is washed if you still can't see the source dump some dye in the oil and check with a UV flashlight in a few days.

Your car was manufactured in 03/1994 so you have the 1MZ-FE.

 

I speak from experience when I say it takes a LOT of dedication to keep a 3VZ-FE engine bay clean.

The problem is (as noted in the previous post) all the seals and gaskets crack and go hard with age.

It's possible to keep a 3VZ-FE free of oil leaks drips on the garage floor, but a lot of commitment is involved.

But the good news is if you're prepared to put the work in, a 3VZ-FE is a solid engine.

On Edit: I see we've clarified the OP is using a 1MZ-FE so no more by me regarding the 3VZ-FE.

 

Yes, I agree. It looks like an aluminium block. For the benefit of the OP, a 3VZ-FE has a black painted cast iron block.

 

Very emmaculate brother!!!! This looks like the engine thats in the 93 ES300 ive been taking parts off of in LKQ mine is a lil different. This VIN look up says mine is a 3VZ

 

Im all over it, finding the dye and getting those areas looked at to see if thats where the leak is coming from. So this VIN look up site says mine is a 3VZ-FE and set up is a lil different than the gentlemans pic below. Coolant reservoir is a little bigger.