allison transmission pto troubleshooting
Pressure Switch 2 (PS2), also known as the Filter Life Switch, is used to monitor the pressure difference between main pressure before the filter and lockup clutch pressure as a method to monitor the main filter for excessive filter restriction. . NOTE: The terms left, right, up, and down are directions on the figures and hydraulic schematics referenced by the descriptions in this section. If the engine temperature gauge indicates a high temperature, the transmission is probably overheated. . Failure to follow these procedures may cause illumination of the CHECK TRANS light and the transmission will be restricted to N (Neutral). . . . . . . . . . . . . . . . . . Display brightness is regulated by the same vehicle potentiometer that controls dash light display brightness. . If temperatures do not decrease, reduce the engine rpm. . . . . The SERVICE TRANS indicator illuminates briefly following a reset to acknowledge the reset was successful. 16 15. the Allison DOC For PCService Tool to reset retarder autodetect or to manually select the presence of the retarder after the PCS5 circuit is repaired. . Do not insert test probes larger than 0.81 mm into the TCM 80-way and transmission 20-way connectors. . WebThe U.S. Armys follow-on contract specified Allison automatic transmissions based on their proven performance since the introduction of the JLTV A1 in 2015. . Jax Austin. . LPS Cleaner is a registered trademark of LPS Laboratories. . Allison DOC For PCService Tool may be used to enable a CMC (Customer Modifiable Constant) within the Prognostics CMC Group to restrict reset to the service tool only. . TCM Reprogramming tab, used to enable the reprogramming capability of the Allison DOC For. . Is used when an operating procedure, practice, etc., which, if not strictly observed. . . . . . . . . . . . . . This occurs when the remaining clutch life reaches. . . . . . . . . Clear any DTCs that may be present and test drive the vehicle to confirm the repair. . . . . . . . . . . . . If the complaint does not return, leave the original TCM installed. . . . . . . . . . . . . . . . We make every effort to keep our service information current and accurate. . . . . The lever selector can be chosen with the lever on the left side or on the right side and with the R (Reverse) position toward the front or toward the rear of the selector. . . . any latin characters (a-z, A-Z) any numbers (0-9) special characters ("-", "_" and ". . NOTE: All external harnesses are OEM supplied. . . . Additional information may be published from time to time in Service Information Letters (SIL) and will be included in future revisions of this and other manuals. Also, many different styles and materials for harnesses are likely to be encountered. . In initial versions of Allison 4th Generation Controls, wire 176 is connected to high side driver 1 (HSD1), wire 111, in the internal wiring harness. . . . . . . This can be discovered by using HY25-3000/US Applications Catalog. . . . . . Loctite is a registered trademark of the Loctite Corporation. . . . . Specific instructions for using many of the available or required service tools and equipment are not included in this manual. This feature is not functional until transmission sump temperatures are between 40150C (105302F). . . . . . . . . Proper service and repair is important to the safe and reliable operation of the equipment. 
. . . If an OLS is known to be present, but has not been detected, troubleshooting the OLS circuit is required. . . . 
. . . Care should be taken when welding on a vehicle equipped with electronic controls. Should be information from Muncie and Chelsea PTO's on line. . If the complaint is confirmed. . Reliable transmission operation and performance depend upon a correctly installed transmission. . . . . . . The newer ones have a clutch pack applied by pressure from the transmission. . . . . . OM History: A historical record of the last 6 resets, including mileage at the time of each reset, may be viewed using the Allison DOC For PCService Tool . It depends on the transmission and PTO. . K1 L. EXTERNALLY-GENERATED ELECTRONIC INTERFERENCE. Also, be aware of other interlocks that would prevent attaining D (Drive) or R (Reverse). . . . . . . Begin troubleshooting by determining the transmission fluid level and TCM input voltage. . . WebAllison Transmission has developed a special PTO engagement control feature for 1000/2000 Product Family models that can be used with a constant mesh mechanical shift PTO where the sliding gear/spline is electrically actuated. . . . . . During normal transmission operation, illumination of the LED indicator shows that a secondary or special operating condition has been selected by pressing the MODE button. . . . . Output speed is less than 250 rpm in neutral, reverse, low (7-speed), first, or second range. . . . . . . . . . . . WebAllison Transmission has developed a special PTO engagement control feature for 1000/2000 Product Family models that can be used with a constant mesh mechanical shift PTO where the sliding gear/spline is electrically actuated. . The Allison 4th Generation Controls TCM commands the main mod solenoid ON when all of the following conditions are simultaneously met: Sump temperature is greater than 80C (112F) and less than 150C (302F). . . . . . . . . . . . . Refer to Section 8 for information concerning performance complaints (non-code) troubleshooting. . . . . This date is commonly used to denote the change configuration level of the TCM. . The four items above are the only CMCs that are autodetectable. . The tools listed below are available for purchase from SPX/Kent-Moore. . ABBREVIATIONS . The Throttle Position Sensor (TPS) can be mounted to the engine, chassis, or transmission. . . . . . New animated screen by screen help support (found in Help. OM Reset: The function may be reset by one of the following methods: NOTE: Prognostic information can only be reset in the higher of two shift schedules, if applicable. . . . . . . . WebWeb-Based Training (WBT) modules currently available through a Basic user Allison HUB account include product familiarization, preventive maintenance and basic diagnostic information for Allison's most popular on-highway transmissions - the 1000 Series, 2000 Series, 3000 Series and 4000 Series automatic transmissions. DIAGNOSTIC CODE LIST AND DESCRIPTION . . 
. . There is a hold override button which must be pressed and held in order to move between certain selector positions. . . . . . . . . At one end of the harness, using jumper wire kit J 39197 or J 39197-A, connect wires 111 and 174 to each other, being careful not to distort the terminals. . . . Transmission issue. Repair parts for the internal wiring harness and for wiring harness components attached to the shift selector will be available through the Allison Transmission Parts Distribution Center (PDC). . . . After a number of warnings occur from the SERVICE TRANS indicator without correcting the condition, the CHECK TRANS light illuminates and DTC P2789, Clutch Adaptive Learning at Limit, activates. . Vehicle Interface Module (VIM). . . . . . . . NOTE: J 47277 is now included in the J 39197-A Kit. . . . If a vehicle receives upgraded engine hardware or software it may become necessary to reactivate the Autoselect feature to redetect the engine current SEM status. . . . . . . . . . . 36 39. . . . . That range will be shown on the shift selector display. Reset by using the specific Action Request in the Allison DOC For PCService Tool . . . . Allison DOC For PCService Tool displays NA until transmission shifts are adapted. . . . . . . . . . 
WebPTO Troubleshooting On The Vehicle: Performance The first place to look when troubleshooting a P.T.O. The engine speed signal is generated by ribs on the shell of the torque converter pump. . . . . . . . . . . . . . . . . . . Hence, the solenoids are referred to as pressure control solenoids (PCS). . . . CODE READING AND CODE CLEARING. . . . 57 56 KEEPING FLUID CLEAN . . Reviewing the Table of Contents will aid you in quickly locating information. NOTE: Most engine upgrades are same type/rating; under normal circumstances there should be no reason to reset the TCM Autoselect. . . . . . . . . . . . Displays o, L; o, K, etc. Typical Allison 4th Generation Control Components. . . . . . . . . . Repair parts for the external harnesses and external harness components must be obtained from St. Clair Technologies Inc. (SCTI). . . Beginning the Troubleshooting Process . . 
. . . . The VIM for 24V systems has all 24V relays. Whenever a transmission is overhauled, exchanged, or has undergone internal repairs, the TCM MUST. . . . 64 66. . . If resets are restricted to the service tool, the selector will not be able to reset the function. When a strip pushbutton shift selector is used, diagnostic information must be obtained by using the Allison DOC For PCService Tool, or a customer-supplied remote display. . D (Drive) or R (Reverse) will not be attained unless the shift is made with the engine at idle. Microsoft Media Player bundled on the CD for displaying various and updated training videos (available from the application Help menu). . . . . . . . . . . . That is controlled by a solenoid and an electric switch on the dash. . . When installed on the users own PC, it will allow the technician to acquire data from the transmissions control system and through the use of embedded troubleshooting manuals, conduct systematic troubleshooting of transmission complaints. . . . . . . When the countdown period is complete, the software will use the highest priority throttle source having a confidence flag set and the autodetect logic will stop. The Allison DOC For PCService Tool can also be used to override autodetect and manually enter the component or sensor to be recognized by the TCM by changing appropriate customer modifiable constants (CMC). . . . . While they place a new label on these transmissions, 545, 1000, 2500, 2000, 3000, and so on, finding parts may be confusing. . . . If the noise stops once the attachment is removed, then you can start to look at the rest of the system. . . . The sensor operates on. DEXRON is a registered trademark of General Motors Corporation. . If the engine temperature indicates a high temperature, an engine or radiator problem is indicated. . . When the C5 clutch is exhausted, as in second through sixth ranges, PS1 verifies the position of the C1 and C2 latch valves. . . . . . . Be sure to determine that the retarder is functioning properly, WARNING: immediately after the 35th engine start. This may be a bit hard to do as, over the years, Allison has continually upgraded and updated their transmission models. . . . . Rotation is picked up by gears meshing or mating with other gears, in order for the Chelsea P.T.O. This opens the PS2 and voltage is sensed on wire 118. . The Diagnostic Trouble Code section lists DTCs and their description. RESTTING OF TCM PARAMETERS TO SUPPORT ENGINE UPDATE . . . ALLISON TRANSMISSION DIAGNOSTIC TOOL, 3-4. . . . The turbine speed sensor on the 4000 Product Family transmission is located on the outside of the main housing. . . . The Filter Life Valve is de-stroked off the return spring in this condition because lockup pressure is high enough to keep main pressure (before the filter) from stroking the valve. . 58, 61. . A second adjustment allows the PTO to re-engage at the desired speed. . . . Subscribe. . . . . . . . . . . Find a facility My Transmission . . During the entire autodetect period, the software will use the highest priority source as the throttle source if multiple sources are detected before any confidence flags are set. . If dirty or corroded terminals are the probable cause of the problems, reconnect the clean connectors and operate the vehicle normally. WebThe service procedures recommended by Allison Transmission and described in this manual are effective methods for performing troubleshooting operations. . . . . . . . . . . . Reduce load. Jumpering the wires together creates a circuit between wires 111 and 174. . . This can be discovered by using HY25-3000/US Applications Catalog. . . . . . . . . A complete wiring schematic is shown in Appendix J. . . . Transmission Control Module (TCM). . . . . . . . . . . . . N1 P. INPUT/OUTPUT FUNCTIONS . . . Webwant your PTO shaft to turn. . . Wiggle connectors, harnesses, and splices when looking for opens. . . . . That is controlled by a solenoid and an electric switch on the dash. C.Operation of Filter Life Valve and Pressure Switch (PS2). . . . . . . . . The Allison 4th Generation Series transmission control module contains a main body assembly and solenoid valve body assembly, which are mounted to an aluminum channel plate. 
. The PTO input to the TCM indicates the PTO is OFF. 
Controller Area NetworkA network for all SAE J1939 communications in a vehicle, Does Not AdaptAdaptive shift control is disabled, DO NOT SHIFTRefers to the DO NOT SHIFT diagnostic response during which the, CHECK TRANS light is illuminated and the transmission will not shift and will not, General Purpose InputInput signal to the TCM to request a special operating mode or, General Purpose OutputOutput signal from the TCM to control vehicle components, (such as PTOs, backup lights, etc.) . . They are expensive.. When SS2 is on, the valve is kept up by SS2. . Failure to do so may. . . . . . . . could result in damage to or destruction of equipment. . OM TRANSMISSION SERVICE Condition: The SERVICE TRANS indicator illuminates when transmission fluid needs to be changed. . . . . . From there, air is released to atmosphere through a valve, and hydraulic fluid exhausts into the PTO. . . . . . . . . . . Multiple sources detected before a confidence flag is set or multiple confidence flags will result in the highest priority source being used as the engine coolant temperature source. Both the main and lube filters must be changed when the SERVICE TRANS indicates the main filter should be changed. . . install a new TCM. There are no restrictions on engine speed in neutral. . . . . . . . . . . . This manual provides troubleshooting information for the 3000 and 4000 Product Families Transmissions. . . Repair parts for the external harnesses and external harness components must be obtained from St. Clair Technologies Inc. (SCTI). See Figure 1. . It is normal for the TCM date displayed electronically to be a few days prior to the date shown on the label. . . . . . . NOTE: If using a TCM from another vehicle is unavoidable, the TCM MUST BE set to factory values and the vehicle MUST BE driven carefully to adapt the shifts to the test vehicle. . . . . While they place a new label on these transmissions, 545, 1000, 2500, 2000, 3000, and so on, finding parts may be confusing. . . . . . . Do this for both wires in the circuit being tested. . . The mechanical aspect has a few key areas of concern. . . . . . . . . . . The Allison 4th Generation Controls feature closed-loop clutch control to provide superior shift quality over a wide range of operating conditions. . . . . . NOTE: If an OLS is known to be present but has not been detected, a possible cause is that the transmission fluid level is too low. . . . . USING THE TROUBLESHOOTING MANUAL. Appendix A deals with the identification of potential circuit problems. . 614 C. Diagnostic Code Schematics . When the C5 clutch is exhausted, as in second through sixth ranges, PS1 verifies the position of the C1 and C2 latch valves. . . . . . . . The solenoid regulator valves are controlled by solenoids that control transmission clutch application. . . . 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