Kia Sorento - Torque On Demand - Do you have D&O?

Ethan Educator South Dakota Posted   Latest   Edited  
Discussion
Drivetrain
2003 Kia Sorento EX 3.5L 4-spd
T-Case Stuck In 4-Auto

Hello,

My Students and I are working on a Kia Sorento with Torque On Demand 4WD System. We have found that the transfer case control unit is placing the transfer case in 4WD as soon as key is turned on. It then remains in 4WD at all times. We have performed testing on transfer case coil and verified proper resistance, also we have checked the front and rear output speed sensors. We found that the front output sensor is pulled low and does not switch to 5V as it should with propshaft turning. Students ran out of time today to take shift motor off and check wiring at passthrough into T-case. Tomorrow we will verify we have good 5V, ground, signal ciruicts from sensor to transfer case control unit.

My question for the group: Is anyone able to access Kia Service Information?

Our resources lack good description and operation. I am trying to gather all needed info to show Students the strategy Kia is using by gathering propshaft speed information to determine when 4WD is needed. I like to always pull up stuff on the board for the class to see how we made it to the point we are in a diag and also help them see system operation so they can piece the info together.

Any help that could be offered, more than what is found on ProDemand, on the system operation or Kia direct info regarding how the trasfer case control unit uses the input from the speed sensors and throttle position sensor to determine need for 4WD apply would be great. I have given a rundown to the Students but I really enjoy having solid information to share if available.

Thanks

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Rudy Technician
California
Rudy Default
 

Being an educator I gotta assume you are aware of NASTF and their website yes? The links to everything OEM is there. nastf​.​org/i4a/pages/inde… In the case of KIA,its $19 for a 72 hour subscription. kiatechinfo​.​snapon​.​com/default​.​aspx

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Ethan Educator
South Dakota
Ethan Default
   

Yes, and I am utilizing Kia Tech Info and having a heck of a time with it. Do you know where they hide the information regarding the trasfer case? No where in Service Info have I found any transfer case info. I am only ever seeing it mentioned under TSB's regarding shudder issues. Just struggling alot on this unit! Here is a picture of Identifix showing where to find transfer case info…

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Steven Mechanic
Washington
Steven Default
 

It's possible that Kia didn't put any detailed information in their SI for the 4WD system strategy. I find that to be the case on a lot of vehicles. They do have info about how power is routed through the transfer case depending on whether it is in 2WD, 4HI, etc... I can give you a link to that in Identifix if you haven't see that already. Otherwise, I think it's likely they don't give any…

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Ethan Educator
South Dakota
Ethan Default
 

Ya, I have utilized Identifix and found more info then Kia had to offer. I was shocked by this, but if that how it is, thats how it is. It helps show my Students that even when you look for the info, sometimes it just isnt there. The tough part for me is when I stress it so much at the training level to utilize the info, then it lacks so heavily, I feel bad in a way. Its a good learning…

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Stanislav Manager
Russian Federation
Stanislav Default
 

Hello Pretty detailed Kia TOD information including wiring diagrams, DTCs and ECU pins' layout could be found on that resource: motordata​.​net 1 week subscription is about 9$.

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Troy Owner/Technician
Washington
Troy Default
 

I would also check in the owners manual as some times they have information on the ability to put the car into 4x4 and that was what happened, hondas vtm-4 gets my customers all the time and I just let them know how it works, is it possible that there is a way to that with this car?

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Ethan Educator
South Dakota
Ethan Default
 

From the info I have found it should only apply the auto 4WD when the inputs to the Transfer Case Control Unit (TCCU) give signs its needed. This comes from the rear t-case output shaft speed sensor, front t-case ouput shaft speed sensor (both internal to the t-case), and throttle position sensor. We currently have found the front output speed sensor is pulled low at all times. Tomorrow we are…

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