Swapping Transfer Case Help
12-28-2016, 11:56 AM
#1
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Wiring Question
1993 4Runner 3.0 V6 A340H Transmission
Original tranny went bad and I found a decent used replacement. Installed the tranny and then the Front Axle would not engage. Thinking it was an ADD issue, I have checked every conceivable relay, switch, hose, etc. All checked out good.
I determined that there was a Solenoid and Pressure switch in the transfer case drain pan area as per the FSM. When I removed the pan, all I found was a solenoid. At this point, I went to the old tranny (glad I saved it), removed the transfer case pan and determined that the transfer case in the truck was different than the original that came out of the truck.
One (In the Vehicle) has just a solenoid and the other (Old Tranny) has a solenoid and pressure switch.
From the outside, everything is identical between these two units, including the wire harness's. But obviously they are different.
Is it possible to eliminate the Transfer Pressure Switch by wiring around it at the ADD Relay ?
Any help would be appreciated.
Thanks
Original tranny went bad and I found a decent used replacement. Installed the tranny and then the Front Axle would not engage. Thinking it was an ADD issue, I have checked every conceivable relay, switch, hose, etc. All checked out good.
I determined that there was a Solenoid and Pressure switch in the transfer case drain pan area as per the FSM. When I removed the pan, all I found was a solenoid. At this point, I went to the old tranny (glad I saved it), removed the transfer case pan and determined that the transfer case in the truck was different than the original that came out of the truck.
One (In the Vehicle) has just a solenoid and the other (Old Tranny) has a solenoid and pressure switch.
From the outside, everything is identical between these two units, including the wire harness's. But obviously they are different.
Is it possible to eliminate the Transfer Pressure Switch by wiring around it at the ADD Relay ?
Any help would be appreciated.
Thanks
Last edited by Fyrflie; 12-29-2016 at 07:28 AM. Reason: New Information
12-29-2016, 08:45 AM
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All of the ID plates have been wiped clean so I can't get any numbers from it.
To work around the switch, can I just unplug it at the relay or is there something else that needs to be done.
To work around the switch, can I just unplug it at the relay or is there something else that needs to be done.
12-30-2016, 09:33 PM
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I would look to the 4x4 linkage not going all the way into position. or your OD solenoid not working.
(What your schematic above is not showing is a green wire going from the connection between the ADD indicator switch and the 4wd light that goes to the ECU)
Does OD work?
Does the 4WD light in the dash come on when put into 4WD?
(What your schematic above is not showing is a green wire going from the connection between the ADD indicator switch and the 4wd light that goes to the ECU)
Does OD work?
Does the 4WD light in the dash come on when put into 4WD?
12-31-2016, 07:19 AM
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Punchy, thanks for the reply.
I confirmed that the current Transfer case (in the vehicle now) does not have the Transfer Pressure Switch like the unit that was taken out.
I have checked and confirmed that all other parts of the ADD system are functioning as they should.
As a temporary fix, I am going to wire around the missing switch to get the system working so my kid can take the truck to school.
Then when I have time, I will rebuild the old tranny/transfer case and swap it out in the summer.
Thank you all for your responses. It has helped tremendously.
I confirmed that the current Transfer case (in the vehicle now) does not have the Transfer Pressure Switch like the unit that was taken out.
I have checked and confirmed that all other parts of the ADD system are functioning as they should.
As a temporary fix, I am going to wire around the missing switch to get the system working so my kid can take the truck to school.
Then when I have time, I will rebuild the old tranny/transfer case and swap it out in the summer.
Thank you all for your responses. It has helped tremendously.
