No 4 Low
02-17-2014, 11:40 AM
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No 4 Low
First off I apologize in advance if there is already a post for this... I have searched the threads, however still a novice to yotatech...
I have a 94 4runner SR5 3.slow automatic..
I can not figure out what happened to my 4Low... 4H works fine and the 4wd light works in both 4L and 4H... It just doesn't want to go into 4L... Is this a common problem? What can I check?
I have a 94 4runner SR5 3.slow automatic..
I can not figure out what happened to my 4Low... 4H works fine and the 4wd light works in both 4L and 4H... It just doesn't want to go into 4L... Is this a common problem? What can I check?
02-21-2014, 10:18 AM
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Unfortunately, the manual doesn't give a lot of troubleshooting information.
http://personal.utulsa.edu/~nathan-b.../transfer.html
Have you tried lying under the truck while someone else moves the shifter? If you have a linkage problem, that's how it will show up.
http://personal.utulsa.edu/~nathan-b.../transfer.html
Have you tried lying under the truck while someone else moves the shifter? If you have a linkage problem, that's how it will show up.
02-21-2014, 10:22 AM
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What happens when its in 4L? You will have to be a little more descriptive. Does the shifter physically move into 4L? If it does, what happens? Engine just revs like its in neutral? Does it feel like its binding up? What?
Its kind of like asking us "My 4Runner is broken, does anyone know whats wrong with it?"
Its kind of like asking us "My 4Runner is broken, does anyone know whats wrong with it?"
02-21-2014, 11:01 AM
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What happens when its in 4L? You will have to be a little more descriptive. Does the shifter physically move into 4L? If it does, what happens? Engine just revs like its in neutral? Does it feel like its binding up? What? Its kind of like asking us "My 4Runner is broken, does anyone know whats wrong with it?"
02-21-2014, 11:02 AM
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The shifter does move into to 4L position however the truck remains in 4H and drives normally as it would in 4H all 4 wheels are engaged but no change in the gearing ... I have tried "on the fly" (under 5mph)...stopped...neutral... reverse and neutral and every combination I can think of.. I will look at the linkage again.
Thanks!
Thanks!
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02-21-2014, 11:10 AM
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The shifter does move into to 4L position however the truck remains in 4H and drives normally as it would in 4H all 4 wheels are engaged but no change in the gearing ... I have tried "on the fly" (under 5mph)...stopped...neutral... reverse and neutral and every combination I can think of.. I will look at the linkage again. Thanks!
02-21-2014, 11:19 AM
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02-21-2014, 11:27 AM
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What happens when its in 4L? You will have to be a little more descriptive. Does the shifter physically move into 4L? If it does, what happens? Engine just revs like its in neutral? Does it feel like its binding up? What?
Its kind of like asking us "My 4Runner is broken, does anyone know whats wrong with it?"
Its kind of like asking us "My 4Runner is broken, does anyone know whats wrong with it?"
Thanks!
02-21-2014, 11:57 AM
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Q: What happens when its in 4L?
A: Same as being in 4H
Q: Does the shifter physically move into 4L?
A: Yes!
Q: If it does, what happens?
A: Just like being in 4H
Q: Engine just revs like its in neutral?
A: No... Vehicle runs and drives fine other than no change from 4H
Q: Does it feel like its binding up?
A: No... No binding
02-21-2014, 01:46 PM
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I believe the automatic transmission on a '94 is integrated with the transfer case, and the Hi-Lo shift is done through a solenoid/vacuum actuator, not through a direct mechanical linkage.
This link http://personal.utulsa.edu/~nathan-b...28operatio.pdf shows the basic operation. Looks like clutch B4 isn't operating (see diagrams on pages 1 and 4).
All of the other FSM links are in this directory. http://personal.utulsa.edu/~nathan-b...autotrans.html
This link http://personal.utulsa.edu/~nathan-b...28operatio.pdf shows the basic operation. Looks like clutch B4 isn't operating (see diagrams on pages 1 and 4).
All of the other FSM links are in this directory. http://personal.utulsa.edu/~nathan-b...autotrans.html
02-21-2014, 03:11 PM
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Keep in mind the diagnostic system will only pick up the electrical part of the problem, but it is certainly the first place to check.
02-21-2014, 06:33 PM
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I believe the automatic transmission on a '94 is integrated with the transfer case, and the Hi-Lo shift is done through a solenoid/vacuum actuator, not through a direct mechanical linkage.
This link http://personal.utulsa.edu/~nathan-b...28operatio.pdf shows the basic operation. Looks like clutch B4 isn't operating (see diagrams on pages 1 and 4).
All of the other FSM links are in this directory. http://personal.utulsa.edu/~nathan-b...autotrans.html
This link http://personal.utulsa.edu/~nathan-b...28operatio.pdf shows the basic operation. Looks like clutch B4 isn't operating (see diagrams on pages 1 and 4).
All of the other FSM links are in this directory. http://personal.utulsa.edu/~nathan-b...autotrans.html
02-21-2014, 06:34 PM
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Good catch. In that case, jyTulsa should check for code 65 http://personal.utulsa.edu/~nathan-b...31diagnosi.pdf
Keep in mind the diagnostic system will only pick up the electrical part of the problem, but it is certainly the first place to check.
Keep in mind the diagnostic system will only pick up the electrical part of the problem, but it is certainly the first place to check.
Thanks!!
02-21-2014, 08:01 PM
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I am assuming the A340H.
The electrical switch for 4WD is on the drivers side of the auto trans.
First thing to look for is if the linkage from the shift lever to the switch arm, Make sure there is no excess play from bad bushings.
Also that the horseshoe shape linkage going around the back of the trans shaft is not bent or pulled from the upper body mount (Notorious problem when a inexperienced tries to drop the trans without unmounting this first).
The 4WD switch has 3 positions being OFF, 4H and 4L.
The 4H position turns a valve in the trans and sends a signal to ADD and for the ECU to turn on OD.
The 4L position also sends power to the planetary gear set to lock, This is just a wire set that travels over the top of the trans to the passenger side of the trans.
After the linkage is checked then look over the wiring harness from the drivers side of the trans to the passenger side to the solenoid for wear.
The electrical switch for 4WD is on the drivers side of the auto trans.
First thing to look for is if the linkage from the shift lever to the switch arm, Make sure there is no excess play from bad bushings.
Also that the horseshoe shape linkage going around the back of the trans shaft is not bent or pulled from the upper body mount (Notorious problem when a inexperienced tries to drop the trans without unmounting this first).
The 4WD switch has 3 positions being OFF, 4H and 4L.
The 4H position turns a valve in the trans and sends a signal to ADD and for the ECU to turn on OD.
The 4L position also sends power to the planetary gear set to lock, This is just a wire set that travels over the top of the trans to the passenger side of the trans.
After the linkage is checked then look over the wiring harness from the drivers side of the trans to the passenger side to the solenoid for wear.
03-14-2014, 06:08 AM
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I shorted the connectors TE1 and E1 and the OD light flashes 2 times per second indicating the electrical system is functioning properly.
I crawled under the truck and had my son to operate the shifter and checked for play or wear. All seems to be fine. Double checked the wires on the tranny and all look connected and no signs of wear or breakage.. This problem really has me scratching my head!!!
I crawled under the truck and had my son to operate the shifter and checked for play or wear. All seems to be fine. Double checked the wires on the tranny and all look connected and no signs of wear or breakage.. This problem really has me scratching my head!!!
