Allison Transmission Turbine Speed Sensor Problems

Things to look out for include harsh shifting inoperable cruise control and a check engine light.

Allison transmission turbine speed sensor problems.

Ud trucks offers allison fully automatic transmissions with new quon 8x4 8 0 litre engine for added vocational appeal. Modern allison transmissions come with a limp mode installed. 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. The computer wants to know if the transmission is working properly.

Output speed sensor transmission connector connector engine speed sensor connector v01634 tps connector turbine speed sensor connector hd b. This is a different shift table that allows the transmission to protect itself from catastrophic failure. 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.

The electronic control system of the automatic transmission allison processes information from sensors and other vehicle systems and sends signals to. This mode is triggered by anything that could cause severe damage to the transmission including severe overheating or towing a very heavy load. 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. Service manuals sm2148en and sm2457en and parts catalogs pc2150en and pc2456en may.

This article will take you through symptoms of a bad transmission speed sensor. You should always assume that this isn t bogus and try and get your transmission. There are generally two speed sensors that work in conjunction to provide accurate transmission data to the vehicle s powertrain control module. 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.

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 limp mode locks the transmission into third gear and. P0717 input turbine speed sensor fix code p0717 input turbine speed sensor circuit no signal. 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.