Why is my AW4 transmission not working at 25 mph?
The harness passes right behind the transfer case shift linkage and can be damaged by the linkage if it is moved around by a transfer case drop or something like that. Normally, the transmission with switch to 2nd at 20 to 25 mph depending on the TPS signal.
What should I do if my AW4 computer goes bad?
If you have yours rebuilt make sure the shops knows how to handle the AW4. If you choose to rebuild it yourself, the FSM has lots of nice pictures. Most of the time the trouble will be associated with the Transmission Control Unit or TCU. It is handy to have a spare for trouble shooting although the computer itself rarely goes bad.
Are there any faults in the Jeep AW4 transmission?
Diagnosis of faults in the Jeep AW4 transmission. The automatic transmission used in the Jeep XJ Cherokee is nearly bullet proof. Seldom does it ever give trouble. Maybe that is why it is so hard to find good information on how to fix it when it occasionally does act up.
What should the engine speed be on a jeep AW4?
The normal sequence is to shift to second, and then third, then forth and then the torque converter will lock up giving an engine speed of about 2700 RPM at 55 MPH. Armed with this information, you could be able to sort through nearly any fault in the AW4.
The harness passes right behind the transfer case shift linkage and can be damaged by the linkage if it is moved around by a transfer case drop or something like that. Normally, the transmission with switch to 2nd at 20 to 25 mph depending on the TPS signal.
The normal sequence is to shift to second, and then third, then forth and then the torque converter will lock up giving an engine speed of about 2700 RPM at 55 MPH. Armed with this information, you could be able to sort through nearly any fault in the AW4.
What happens when the TCU is off on AW4?
One controls the torque converter lockup and the other two select the four gears in a binary fashion. As you can see, if the TCU has no power, you will get forth gear in D position. Also with the TCU off, 3 will give you third gear and 1-2 will give 1st gear. You can’t get 2nd manually.
What to do if your Jeep AW4 is not working?
To test if the trouble is electric or mechanical, pull the fuse to the TCU or disconnect the wiring harness. 1-2 will give first gear only, 3 will give third gear. D will give forth gear. The torque converter will not lock manually. You can drive the Jeep just fine this way until you figure out what is wrong.