Transmission Slipping while cold start and once hot its fine

[JBojini]

Hey experts,

I got LC1997 1FZFE Automatic recently, done ATF change and filter as well, few days it was fine and suddenly there was lost of 2nd gear.

I changed solenoids after looking some threads in this forum and topped up ATF ( done by my mechanic). The issue here is, when it is cold and runs for 10 to 15 mins, the issue still persist, sudden slips and directly shifts to 4th gear, and once it is in normal temperature afyer 10 to 15 mins it drive fine and shifts very smooth without any issue.

what could be the reason and from where i need to start.

JB

 

[Fj80oregon]

Adjust your transmission cable

 

[OffRoadScott]

Make sure you are adding the same amount of ATF you took out, and. are you checking the fluid level when the transmission has warmed up?

 

[JBojini]

Make sure you are adding the same amount of ATF you took out, and. are you checking the fluid level when the transmission has warmed up?

Hey,

I checked the fluid level when hot it is fine, the only thing need clarity is, my mechanic might have topped up with non genuine ATF will this cause issue?

JB

 

[Malleus]

You should first check to see if there are any diagnostic trouble codes (DTC), stored in the TCM. You will need an OBDII scanner to do this. The initial pre-check to be performed before any work is started, is listed on pages DI-135 through DI-146. The procedure for finding the trouble codes, without using a Toyota tool (hand-held tester) (which you won't have) is on page DI-137. Trouble codes are listed following those pages.

The 2nd coast brake may be failing to engage, because it's sticking in its bore. If you have a transmission service center you trust, take the truck there an ask them to check the action of the 2nd coast brake piston. They will need to drain the fluid and either pull the piston (it's on the outside of the case) and check the O-rings, or, at worst, remove the pan and valve body and check the action by using comepressed air.

I assume you have an A343F transmission? If you haven't already, download the 1997 (US specfication) service manual (RM510U) from the Resources forum, 80 series section, here on this site.

The throttle cable inspection and adjustment procedure, mentioned above, is explained on page DI-142.

The procedure for removal, inspection and testing of the 2nd coast brake piston is in the unit repair manual (RM479U).

 

[Malleus]

Hey,

I checked the fluid level when hot it is fine, the only thing need clarity is, my mechanic might have topped up with non genuine ATF will this cause issue?

JB

unlikely, unless its not ATF

 

[JBojini]

You should first check to see if there are any diagnostic trouble codes (DTC), stored in the TCM. You will need an OBDII scanner to do this. The initial pre-check to be performed before any work is started, is listed on pages DI-135 through DI-146. The procedure for finding the trouble codes, without using a Toyota tool (hand-held tester) (which you won't have) is on page DI-137. Trouble codes are listed following those pages.

The 2nd coast brake may be failing to engage, because it's sticking in its bore. If you have a transmission service center you trust, take the truck there an ask them to check the action of the 2nd coast brake piston. They will need to drain the fluid and either pull the piston (it's on the outside of the case) and check the O-rings, or, at worst, remove the pan and valve body and check the action by using comepressed air.

I assume you have an A343F transmission? If you haven't already, download the 1997 (US specfication) service manual (RM510U) from the Resources forum, 80 series section, here on this site.

The throttle cable inspection and adjustment procedure, mentioned above, is explained on page DI-142.

The procedure for removal, inspection and testing of the 2nd coast brake piston is in the unit repair manual (RM479U).Thanks f

 

[JBojini]

Thanks for the details!!!

This is A442F Transmission and it is GCC specs Car does not have the OBD2. I tried to check the codes with paper clip method and got 62,63,64 and 65 appearing . Also checked the manual and found If codes 62,63,64, or 65 appear, there is an electrical malfunction in the solenoid. Causes due to mechanical failure, such as a stuck valve, will not appear."

Dont know where to start

JB

 

[Malleus]

OK, so you have a manual for the A442F. You have a comminucation problem with the solenoids to the TCM, most likely resulting from mishandling the wiring during changing the solenoids. You should do the following (or have someone do this for you, if you don't have the tools or skills):

1» Check the terminals in the connector housings which are connected directly to the solenoids. This will require removing the pan, so prepare to drain and save the fluid, it can be reused. This will also require a multimeter, so make sure you have one on hand, or have soemone with you who does and knows how to use it.
» First, check the wiring pigtail from the Neutral Safety Switch, to the solenoids. This is most likely where your problem is; look for broken insulation, loose terminlas inside the connector housings, or broken connector housings.
» The terminals and connector housings can be purchased separately; if you need, or want, a new pigtail, contact Dave Stedman at Japan4x4.com and ask him to quote part number 82125-36010, or whatever has superseded it, if it is not available.

2» If the above isn't the problem, You will have to check the other end of the solenoid wiring, that goes into the TCM. The procedure for checking this begins on page AT-29 of the Service Manual. I'm using the 1994 service manual (also in the Resources forum for free download), because that's the last year the US 80 series had a A442F in it. Your manual may be different; search for "Electornic Control System" in the troubleshooting section if your page layouts are different.
» You will need to go step by step through the inspection and troubleshooting procedure in order to find and correct the fault. Unfortunately, there are no shortcuts, no matter how many YouTube videos there are. The manual is very easy to read and understand, at least for me, so if you have any trouble following it, report back and we'll try to help as much as we can.

 

[Mandrake]

Thanks for the details!!!

This is A442F Transmission and it is GCC specs Car does not have the OBD2. I tried to check the codes with paper clip method and got 62,63,64 and 65 appearing . Also checked the manual and found If codes 62,63,64, or 65 appear, there is an electrical malfunction in the solenoid. Causes due to mechanical failure, such as a stuck valve, will not appear."

Dont know where to start

JB

In your first post, you stated you have a '97, which has an A343F, not the 442. Also, if you have a '97, you should be pulling codes with a scanner and not the paperclip method.

Also, it's not clear who did what work, but if your mechanic did the work in the tranny then diagnosing and fixing this is his problem, not yours.

 

[Malleus]

In your first post, you stated you have a '97, which has an A343F, not the 442. Also, if you have a '97, you should be pulling codes with a scanner and not the paperclip method.

Also, it's not clear who did what work, but if your mechanic did the work in the tranny then diagnosing and fixing this is his problem, not yours.

He has a Gulf States model, not a US model

 

[Mandrake]

He has a Gulf States model, not a US model

I somehow missed that. Thanks!

 

[JBojini]

In your first post, you stated you have a '97, which has an A343F, not the 442. Also, if you have a '97, you should be pulling codes with a scanner and not the paperclip method.

Also, it's not clear who did what work, but if your mechanic did the work in the tranny then diagnosing and fixing this is his problem, not yours.

OK, so you have a manual for the A442F. You have a comminucation problem with the solenoids to the TCM, most likely resulting from mishandling the wiring during changing the solenoids. You should do the following (or have someone do this for you, if you don't have the tools or skills):

1» Check the terminals in the connector housings which are connected directly to the solenoids. This will require removing the pan, so prepare to drain and save the fluid, it can be reused. This will also require a multimeter, so make sure you have one on hand, or have soemone with you who does and knows how to use it.
» First, check the wiring pigtail from the Neutral Safety Switch, to the solenoids. This is most likely where your problem is; look for broken insulation, loose terminlas inside the connector housings, or broken connector housings.
» The terminals and connector housings can be purchased separately; if you need, or want, a new pigtail, contact Dave Stedman at Japan4x4.com and ask him to quote part number 82125-36010, or whatever has superseded it, if it is not available.

2» If the above isn't the problem, You will have to check the other end of the solenoid wiring, that goes into the TCM. The procedure for checking this begins on page AT-29 of the Service Manual. I'm using the 1994 service manual (also in the Resources forum for free download), because that's the last year the US 80 series had a A442F in it. Your manual may be different; search for "Electornic Control System" in the troubleshooting section if your page layouts are different.
» You will need to go step by step through the inspection and troubleshooting procedure in order to find and correct the fault. Unfortunately, there are no shortcuts, no matter how many YouTube videos there are. The manual is very easy to read and understand, at least for me, so if you have any trouble following it, report back and we'll try to help as much as we can.

Hi,
My mechanic was saying the pic pasted which is connection to transmission is broken, is this something causing issue. He had checked all connections with multimeter and everything is working as per him, the only thing was connector which is broken which connects to ecm. Can I get the part number for the broken connector
Cheers
In

 

[Kernal]

I checked Partsouq, Toyota, LAND (for Land Cruiser), then FZJ80, then chose GCC (Gulf Cooperation Council region) and some models as late as 1997 did come with a different ATM transmission than US models. FWIW

 

[Malleus]

The A34XX was designed for the US markets for the EPA

 

[smorkington]

Low fluid level… once it heats up fluid expands and issues go away

 

[Malleus]

Hi,
My mechanic was saying the pic pasted which is connection to transmission is broken, is this something causing issue. He had checked all connections with multimeter and everything is working as per him, the only thing was connector which is broken which connects to ecm. Can I get the part number for the broken connector
Cheers
In

View attachment 3962491

The last five digits of the part number are on the rear of the connector housing. The first five digits are 90980-

 

[Kernal]

Take a photo of the connector showing the number (mentioned by Malleus) and post it up

 

[JBojini]

Low fluid level… once it heats up fluid expands and issues go away

Thanks!! Topped up ATF and this is shifting fine now. However new issue popped up, when going around 100KMPH getting grinding noise, not sure if this coming from Transmission or some other area. Also when accelerating feeling light vibration i.e., when i push the gas pedal and when let off there is no vibration.

when coasing above 100 KMPH light grinding noise is coming not sure from where

 

[smorkington]

Thanks!! Topped up ATF and this is shifting fine now. However new issue popped up, when going around 100KMPH getting grinding noise, not sure if this coming from Transmission or some other area. Also when accelerating feeling light vibration i.e., when i push the gas pedal and when let off there is no vibration.

when coasing above 100 KMPH light grinding noise is coming not sure from where

check universal joints / driveshaft