How do I reset my Allison?

How do I reset my Allison?

Allison Transmission Transmission Service Indicator Light Reset

1. To reset the service indicator light.
2. Turn the key on, do not start the engine.
3. Move the shift selector to N-D-N-D-N-R-N, pausing briefly (less than 3 seconds) between each selector movement.

Why does my Allison Transmission key not work?

Get a flash on the shift gear display on the key turn. Then dark. Dash gauges act normal. Sounds like a ground problem check and clean the chassis ground.

What to do if your Allison shift pad has no power?

If no power when the key is on check the small post, if only one it should be positive (Hot with the key on) or if two small post one is hot and one is ground (with the key on). If you have power to th small post but still only have power to one side of the solenoid then you have a bad solenoid.

What is the mode button on an Allison Transmission?

One LED dislays the gear selected while the second displays the actual gear that the transmission is in at that time. There is also a MODE button. The MODE button may allow the driver to enable a secondary shift schedule or other special function that has been previously programmed into the electronic control unit at the request of the OEM.

What kind of keypad do I need for Allison Transmission?

Allison transmissions are pretty much standard in the Class A motorhome industry. Gasoline powered chassis can use either a column mounted transmission gear selector lever or a dash mounted shift selector keypad. Diesel pushers almost exclusively use the electronic keypad.

Why does my Allison Transmission have a blank display?

1) Transmission ECM fuse inside of the battery box! Corroded fuse holder! Replace the fuse even if it doesn’t look or test out bad. Check these first. 2) The ECM on most Allison Transmissions are always fed power. The problem with this is that the power wire could be corroded internally or at a butt connector.

If no power when the key is on check the small post, if only one it should be positive (Hot with the key on) or if two small post one is hot and one is ground (with the key on). If you have power to th small post but still only have power to one side of the solenoid then you have a bad solenoid.

Why is my Allison Transmission always fed power?

Check these first. 2) The ECM on most Allison Transmissions are always fed power. The problem with this is that the power wire could be corroded internally or at a butt connector. The dampness in the wire could have corroded it away. (Sound familiar?)

Why does the Allison automatic not have a battery?

The Allison Automatic may not always get it’s power from “the battery” but it should be on it’s own full time power supply. They do this because they want the maximum amount of power to it without the OEM wiring giving it a voltage (eratic symptoms) drop. They still have a key on feed wire.