Trouble upshifting

I haven't found a single one anywhere except the different part for a 4WD. Mine is 2WD.

 

https://partsouq.com/ go there and put in your vin number try to find the part number for your vehicle then google search / Amazon / ebay etc.

 

Yeah, I use that site often and I've been through it with this part. The part is discontinued. It's not available anywhere. 3552035211

 

This is just a cable right? could you get a universal cable and cut and crimp to fit ? measure your old cable first.

 

have a 98 rwd....but 2.4....

got a backup for almost everything critical..this is mine....

35520-35180 Genuine Toyota Cable Assembly, Throttle (toyotapartsdeal.com)


I can take pics and measurements to see if even close...










Yeah I keep this in the box with the extra rear brake cables and extra doorman hood cable, throttle cable, cruise cable.......some of which you can only order from Japan....if at all...

alot of pre-2000 is becoming unobtainium.... especially the non 4wd stuff......trannys/steer racks...

All this was easily obtainable in the past, but now a lot of its down to aftermarket or salvage.........and as time passes its only gonna get worse...

 

if this cable works for ya, its cheaper at mcgeorge toyota. https://toyotaparts.ourismantoyotaofrichmond.com/oem-parts/toyota-cable-assembly-throttle-3552035180

 

Building a new cable assembly would be tough for me. It has all kinds of things on it.
35520-35180 is definitely only meant for 2.4L. I don't know what's different, but something must be. I'd have to drop the pan to disconnect and measure the thing out and take pics.
I ordered the 35520-35190 cable (for 4wd version) for fun. That would be great if it's just a minor difference but usable. I'm suspecting that it's different on the transmission end, because the 4wd probably doesn't use the A340E transmission?

BUT... that might all not matter, because I got the cable situated better today to where it isn't dragging on the sheathing, and I think the cable assembly is actually ok. I also adjusted the cable tension, and the shifting in general feels better now, except for the main issue of this thread, 1st to 2nd hesitation. So back to the earlier plan, filter and solenoids.

 

https://www.tacomaworld.com/threads/wtb-transmission-kickdown-cable.831529/#post-29805169

 

Long time lurker, first time poster.

A kickdown cable will not have any affect on upshifts.

Things that could impact when the transmission upshifts:
- transmission input and output speed
- throttle position
- torque
- slow moving or stuck valves
- bad solenoids in the valve body
- slipping/sticking clutch plates or pistons

if pushing in the pedal just a little more always results in the upshift, then it’s extremely unlikely it is anything inside the transmission such as valves or solenoids. Far more likely it’s throttle position, speeds or engine torque (if the controls are looking at calculated torque).

Describe the hesitation a bit more for me. Does it feel like it’s shifting normally, just later than expect or does it feel like there is a flare in engine speed during the shift - clutch slipping.

if you want to rule out a slow valve or solenoid,don’t push the pedal any further and see if it shifts just slowly. If it ONLY shifts when you give it more skinny pedal then it’s not a valve or solenoid. But if you hold steady state and it shifts just slow and it’s consistent you could have a slow moving valve or solenoid.

 

It happens particularly after coasting around a corner in a parking lot at slow speed and then pressing the pedal gently and steady. It will go up 15mph or so as the engine roars in 1st gear. Eventually some seconds later it will shift up on its own. If I give it a little more gas, or let off and try again, it will shift up. So driving out on the road with more deliberate and higher speed maneuvers the issue never occurs.

I can read live OBD2 data if there's anything that might help.

 

I'm not super familiar with this particular transmission. I'm looking through the factory service manual now. From what you are saying, to me, it really doesn't sound like an internal mechanical problem on the transmission, with the possible exception of the throttle connection. I did not realize the throttle cable goes to the transmission, I'm used to slightly newer transmissions with more electronics. However, fundamentally the operations haven't changed.

My next step would be to triple check the throttle cable adjustment. I have attached the instructions for that.

My next steps would be to verify the signal of the throttle position sensor and the vehicle speed sensor. There are actually two vehicle speed sensors. There is one connected to the cable of the gear driven speedometer and there is one on the output of the transmission. The gear driven speedo cable is connected on the output and there is an electronic speed sensor on the output just below the speedometer driven gear cable connector. Ideally all of those signals match. I have also attached that page from the manual.

 

I tried watching two speed sensor readings from the scanner, and they were within 0-1 mph of each other and seem to be ok. I don't know if they were the same sensor and one reading was just delayed by software. No other speed related ones I found on the scanner (there are a lot of data points in the scanner that the truck doesn't provide) were reading anything. I looked at that troubleshooting chart too, and I got a replacement drive shaft revolution sensor in case it's needed, which looked the most accessible from diagrams. I can't tell from diagrams where the other one is.

I was going by those instructions before for the throttle cable adjustment, but it's not accurate because it relies on the position of the bracket on the intake plenum holding the cable supposedly exactly the right number of millimeters from the throttle linkage. My bracket is tweaked, so that's out the window anyway. I adjusted it to take out all slack instead. Tighter was causing really high shift points and hard shifts.
https://www.tacomaworld.com/threads/kickdown-cable-tension.831547/

 

The other speed sensor appears to be on the back of the instrument panel.

Honestly, if it were a speed sensor issue, I’d expect issues on other shifts. But resolution on speed sensors is definitely more difficult at lower speeds.

I’m still suspicious of the throttle cable given that your bracket is bent. But I get what you are saying about adjusting it. If I were to throw parts at anything, I’d start with that bracket.

 

If i may add just a little more info, the a340e has three speed sensors, two on tail take off they offer vehicle speed to ecu and speedo, the other is located on left side midway up on case its called the turbine speed sensor check for good connection there. Also there are two temp sensors on coolant manifold one for gauge in dash the other is for ecu, if the ecu senses low engine temps it will hold shift points till engine warms up, hope you find your issue.

 

Cool, I'll look at the ECU coolant temp sensor.

What case are you talking about as far as the speed sensor on it? 2wd so no transfer case.

I have a new throttle cable bracket coming.

 

The turbine speed sensor is on the left side of the transmission forward of the line pressure cable (what most wrongly call the kick down cable) it is a reluctor type sensor and has a electrical connector make sure the connector is good no corrosion or bad pins. It tells the ecu what the input speed is to transmission after torque converter, part of the shift decision.

 

I may have found the issue. The front most solenoid (of three) on the transmission valve body is rattling when I shake it, and there's only a very faint click when given voltage. The two other solenoids are engaging with a loud click, as are the aftermarket replacements for all that I have ready. Sounds like it's bad, right?

I'm thinking I'll replace all three?

Anything else to check while I have it open? The valve body looks pretty clean. I'll also do new fluid, which is dirtier than I expected, and new filter.

 

Thanks for reporting back, sounds like you found the shifting issue, clean the pan and magnets real good, also the pan mount flange, the bolt holes can have a lot of old rtv and dirt build up, can be easily stripped. If it was me and i was already there, yeah id replace all the solenoids…but thats me.
R/
Andy

 

https://www.tacomaworld.com/threads...sions-write-up-your-4-speed-automatic.325531/