Allison Transmission Turbine Speed Sensor Problems

Typical 4000 mh series transmission turbine speed sensor mounting pad input speed sensor nameplate fill tube and dipstick output speed sensor feedthrough harness connector v06342 cooler ports main pressure tap mounting pad both sides cooler ports feedthrough harness connector breather breather.

Allison transmission turbine speed sensor problems.

This limp mode locks the transmission into third gear and. This mode is triggered by anything that could cause severe damage to the transmission including severe overheating or towing a very heavy load. 1 limp mode allison 1000 model the allison transmission 1000 model has a feature called limp mode in which the transmission locks itself into third gear. This is a different shift table that allows the transmission to protect itself from catastrophic failure.

You should always assume that this isn t bogus and try and get your transmission. If you have a p0717 input turbine speed sensor circuit no signal trouble code this post will help you understand what it is and how to fix it. There are generally two speed sensors that work in conjunction to provide accurate transmission data to the vehicle s powertrain control module. For the smooth operation of the automatic transmission allison it is necessary to comply with the requirements of the manufacturer in time to make maintenance and troubleshoot any problems.

This manual provides troubleshooting information for allison transmission division md hd b series transmissions. The computer wants to know if the transmission is working properly. Service manuals sm2148en and sm2457en and parts catalogs pc2150en and pc2456en may. The electronic control system of the automatic transmission allison processes information from sensors and other vehicle systems and sends signals to.

Things to look out for include harsh shifting inoperable cruise control and a check engine light. Output speed sensor transmission connector connector engine speed sensor connector v01634 tps connector turbine speed sensor connector hd b. Ud trucks offers allison fully automatic transmissions with new quon 8x4 8 0 litre engine for added vocational appeal. Replacing turbine sensor allison 3000 series trans.

Ud trucks has launched a version of its popular quon 8x4 heavy duty model and for the first time is offering the allison 3200 series automatic transmission coupled to its 8 0 litre engine. The first is known as the input shaft speed iss sensor. The transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. This article will take you through symptoms of a bad transmission speed sensor.