. . . . . . Check with your Allison Transmission service outlet for the currently applicable publication. . . Selecting RESET ADAPTIVE SHIFT PARAMETERS will not reset autodetect logic. . AUTODETECT FEATURE. . . . . . 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. . . 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. The solenoids produce an output pressure that is proportional to current from the TCM. . During an electrical interruption, the latch valves and two normally high, PCS1 and PCS2, enable the transmission to operate in a limp mode, allowing the operator to drive the vehicle to a location where it can be serviced. . . . The Allison transmission 1000 model has a feature called "limp mode", in which the transmission locks itself into third gear. . . . . TroubleshooTing guide. . . . . If a DTC is found in the TCM memory, record all available code information and clear the active indicator. . 58, 61. There are no restrictions on engine speed in neutral. 1. . . Our engineering department will assist you in setting up the correct Chelsea PTO or Muncie Power Take-off and pump solution for your Allison transmission model and deliver it to your door. . . . . NOTE: For the latest requirements, please refer to www.allisontransmission.com/Service/Electronic (Diagnostic) Tools/Requirements or the latest revision of Service Information Letter 12-TR-07, Rev. . . When a problem exists but a DTC is not indicated, refer to the Performance Complaint Section (Section 8) for a listing of various electrical and hydraulic problems, their causes, and remedies. . . . . . . ELECTRONIC FLUID LEVEL READING (SHIFT SELECTOR), 6-4. . . However, there are instances when the . . . The technician should also have the mechanical aptitude required to connect pressure gauges or transducers to identified pressure ports used in the troubleshooting process. . Refer to Section 6, Diagnostic Trouble Codes, for the code clearing procedure. . . . . . . . 855 844-SALE | 855 844-7253. . . . When SS1 is energized, control main pressure flows to the top of C1 and C2 latch valves. If engine rating is not compatible, the vehicle must be returned to the OEM for engine recalibration. . . . . . . . If display is flashing, shift is inhibited. . install a new TCM. . . . 3.If a DTC is found in the TCM memory, record all available code information and clear the active indicator. . The PTO is driven off the torque converter turbine and is rated for 250 lb-ft of torque. Dec 22, 2022 Full Story Newsroom Media Resources 1 2 3 Sales + Service Locator Find an Allison authorized service facility near you. . . . . . . . . Failure to perform maintenance and reset the SERVICE TRANS indicator within a specified period results in the illumination of the CHECK TRANS light and DTC P0897, Transmission Fluid Deteriorated, being set. . . . . . . . . TCM DIAGNOSTIC PROCEDURE . . . . . . Remember that some problems may be temperature related. . . . . . . The WARNINGS, CAUTIONS, and NOTES in this manual apply only to the Allison transmission and not to other vehicle systems which may interact with the transmission. . 57 A. Autodetect is active on the first 25 engine starts and, in the case of throttle source detection logic, may continue past 25 ignition cycles until a valid source is determined (details follow in A through D below). . . . . . . Allison HT740 shift problem Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. . Be sure to determine that the retarder is functioning properly, WARNING: immediately after the 35th engine start. . Filter Life Valve Hydraulic Schematic. . . Polyethylene 540 m/s. . . . . . . . NOTE: Once TCM Autoselect locks, the only way to reactivate is to perform a reset procedure (refer to Paragraph 38). . . 2.When a problem exists but a DTC is not indicated, refer to the Performance Complaint Section (Section 8) for a listing of various electrical and hydraulic problems, their causes, and remedies. . . . . . . . . . . . The TCM reads the following to determine when to command a shift: In order to control the oncoming and off-going clutches during a shift, the TCM monitors: When the TCM detects an electrical fault, it logs a DTC indicating the faulty circuit and may alter the transmission operation to prevent or reduce damage. . OUTPUT FUNCTIONS . . . The TCM is now reset to Autoselect and will start looking for supporting engine software. . . . . ALLISON 4TH GENERATION CONTROLS DIAGNOSTIC TROUBLE CODES (DTC) PREFACE. . . 20-WAY TRANSMISSION FEEDTHROUGH HARNESS CONNECTOR, Figure 12. . Clean dirty terminals or connectors with isopropyl alcohol and a cotton swab, or a good quality. . . Typical 4th Generation Electronic Controls External Wiring Harnesses. . . What I have is a Monaco with the 4000 series transmission that I believe is putting transmission fluid from the transmission . . . Vehicle Interface Module (VIM). . . . . . . . ), FOREWARD. . . But things may go wrong rather unexpectedly. . . . . . Cold Check Procedure . . . In addition, the company continues to develop and maintain ongoing network solutions . . Description of the 3000 and 4000 Product Families Allison 4. . . . b.If the continuity test is good (02 Ohms resistance), remove the jumpers. . . . . . . . SPECIAL ELECTRONIC/ELECTRICAL TOOLS . . Be sure the transmission model matches the calibration in the TCM. . . . Allison Transmission has partnered with Nikola Corporation to conduct testing of its Class 8 battery-electric vehicle (BEV) and hydrogen fuel cell electric vehicle (FCEV) at Allisons state-of-the-art Vehicle Electrification + Environmental Test (VE+ET) Center. . . . Replace air valve. . . . NOTE: Illustration is not to scale. . A1 B. . If an OLS is known to be present, but has not been detected, troubleshooting the OLS circuit is required. 63 64. . . Working underneath the truck while it was still running, a protruding set screw on the PTO drive shaft caught the collar of his coveralls and quickly entangled him. . . . . . . . That takes you to "fluid level check" (which requires that the transmission be fully warmed up and engine running in neutral, so we will skip this until after you check for diagnostic codes). . . . . . . . . NOTE: The Filter Life Monitor triggers the SERVICE TRANS icon following a reset if the Filter Life indicator switch reopens. . . . . . . . . . . . USA 3368 Posts. . . . . Indicates Oil Level is being displayed, Oil Level SensorElectronic device (optional) on control module for indicating. During an electrical interruption, the latch valves cause the transmission to engage specific clutches based on the range in which the transmission was operating when the interruption occurred. . . . . Refer to Section 6. . . . The system that enables the transmission to default to totally hydraulic operation has been incorporated to minimize the impact of an electrical interruption. . . . These warnings and cautions are not exhaustive. . . Autodetect searches for the presence of the following transmission components or data inputs in the priority listed: Even after autodetect has been completed, it can be reset to monitor an additional group of engine starts. . 118 111. . . SCTI will have parts catalogs available. . . . Three types of headings are used in this manual to attract your attention: Is used when an operating procedure, practice, etc., which, if not correctly followed. drive gear rating (continuous operation) Using one PTO: 930 Nm. . . . . It is normal for the TCM date displayed electronically to be a few days prior to the date shown on the label. . . . . . . Failure to do so may. . Not available with (PTO) Power take-off. If the gears do not mesh at installation, the wrong PTO has been installed." Don't assume that a PTO intended for a specific purpose will suffice for another. Then the TCM concludes that no OLS is present. . . 71 72. A temperature sensor (thermistor) is located in the internal wiring harness. . . The ER Saf -T- liner Pusher buses all came equipped with 3000 series transmissions and for the most part they were very reliable. NOTE: Information concerning specific items is contained in the appendices located in the back of this manual. . . . . . . . . . . Allison Transmission at the International Commercial Vehicle Fair IAA introduced a new 9-speed gearbox and announced the expansion of its electric drive solution portfolio. . . . . . Reliable transmission operation and performance depend upon a correctly installed transmission. . . . To shift from forward to reverse, select N (Neutral) and then R (Reverse). . . . . This opens the PS2 and voltage is sensed on wire 118. . Reset may be necessary if a device known to be present is not detected or if an autodetectable component or sensor was added after the initial vehicle build. Verify a new engine rating by checking the engine data tag. . . . . The transmission is considered to be overheated when any of the temperatures in Table 32 are exceeded:. TM History: Use the Allison DOC For PCService Tool to display the amount of transmission operation from the initial service indication until the service reset. . A list of all documents refer-enced in this document can be found at the end of this document. . . . Refer to Section 6. . However, even these revolutionary pieces of equipment can have. . . 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. . An OLS will be identified as present and the OLS autodetect logic will stop once it is detected during any single engine start. . . . . Use the P/N from your appropriate parts catalog or from Appendix E in this manual. . The exception is when C5 clutch is applied. . . . Additionally, OLS detection must occur within 12.5 seconds on any given engine start. These warnings and cautions advise against using specific service procedures that can result in personal injury, equipment damage, or cause the equipment to become unsafe. . Loctite is a registered trademark of the Loctite Corporation. The tools listed below are available for purchase from SPX/Kent-Moore. . A.Control System Prognostics Operation and Display. . . . . . . . . . . All Allison transmissions are PTO ready. . . . . . . . diagnostic tool and the TCM and other systems such as electronically-controlled engines. . . . CODE READING AND CODE CLEARING. . . NVL is, attained by turning D solenoid ON (in addition to E solenoid) and the C4 and C5. . . . The trans with the PTO setup is a different factor order code. When a clutch is applied, clutch feed pressure is routed through the latch valves to the clutch piston. Found in the TCM is now reset to Autoselect and will start looking for Supporting engine software available. 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