. . . . . . . . 71 72. . . . . . This can be discovered by using HY25-3000/US Applications Catalog. . . If the complaint does not return, leave the original TCM installed. . . . . . . . . . 36 39. A confidence flag will be set once a source is detected for five consecutive engine starts. . . . The VIM for 24V systems has all 24V relays. . . . . The Prognostics pressure switch is activated when fluid exiting the main filter drops below a predetermined pressure. . . Allison HT740 shift problem Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. . . . . . Even if the vehicle is moving. . Take time to review the Table of Contents and the manual. G1 H. HYDRAULIC SCHEMATICS . iii TRADEMARKS USED IN THIS MANUAL . . . The diagnostic pressure switch PS1 is mounted on the solenoid valve body assembly and performs the following two functions: When the C5 clutch is filled, PS1 senses the PCS2 solenoid regulator valve position to verify proper C3 clutch control in reverse, neutral, and first range. . The trans with the PTO setup is a different factor order code. . RESETTING A TCM PARAMETERS TO SUPPORT ENGINE UPDATE, 3-9. . . . . . . . . . . . If your implement/pump will fit, it is PTO capable. . If the ignition cycle counter completes the 35 cycles before there are three consecutive detections of a retarder, the software will log that there is no retarder and the retarder autodetect logic will stop. . . P0897 indicates the remaining fluid life has reached 1 percent. 11 12. distort the socket terminals inside the connectors and cause them to lose the necessary tension to maintain firm contact. Free 800.966.9860. C.Operation of Filter Life Valve and Pressure Switch (PS2). 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. . . . . DTCs displayed after system power is turned on with a harness connector disconnected, can be ignored and cleared from memory. The service procedures recommended by Allison Transmission and described in this manual are effective methods for performing troubleshooting operations. .P1 Q. THERMISTOR TROUBLESHOOTING INFORMATION . . . . . . .F1 G. WELDING ON VEHICLE/VEHICLE INTERFACE MODULE . PTO mounting pads. VEHICLE INTERFACE MODULE . . . . . . . . . The transmission may be locked in a range. . Replace trigger Check air pressure. . . . . At least until the wiring problems began a year or two later. . . . . . . . . Check wiring for damaged/melted wires. . . . . Output speed is less than 250 rpm in neutral, reverse, low (7-speed), first, or second range. . . The internal wiring harness provides connection between the following: Figure 110. . . . . . . . . Disconnecting and reconnecting the TCM can often correct faulty wiring harness connections that may have been present. . . . . J1 K. SOLENOID RESISTANCE CHARTS . . The display message indicates the operating status of the transmission main filter, based on the measured pressure drop across the filter. . . . . Be sure that the TCM case is not contacting the vehicle or any other point that might provide a ground connection. . . ), FOREWARD. . . . . . 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. . . . . . . . . . . Dont keep driving a vehicle with a faulty part! . . th. Remember to do the following when testing for shorts and opens: Minimize movement of wiring harnesses when looking for shorts. . . . . . . This wiring configuration is designated TID A. . . . . . . . . . Failure to perform maintenance and reset the monitor after a calibration-defined number of warnings results in the illumination of the CHECK TRANS light. . . . . . According to John Hylton, application engineering, Allison Transmission, "The PTO gears are in constant mesh with the transmission gears after installation. . . . SCTI recognizes Allison Transmission, manufacturers, and SCTI part numbers. . . . Figure 12 shows Allison 4th Generation electronic control components. . . . . . . 14 B. . The differential pressure limit is verified for a period of time to make sure there is no false filters change indication. . . . On the drop down menu, select Reset SEM Autodetect. . . . The lamp strategy for the icon varies, either flashing, or steady, to indicate to the operator which function detected the threshold value was reached. . . Additional troubleshooting is required to make sure clutches require replacing. Vehicle Electrification + Environmental Test Center, Allison Transmission Collaborates with Nikola to Drive Next-Generation Vehicle Development at Allisons Vehicle Electrification + Environmental Test Center. The PTO input to the TCM indicates the PTO is OFF. . . . . . . . Use special tools when and in the manner recommended. . . . DIAGNOSTIC TROUBLE CODE LIST AND DESCRIPTION, 6-6. . . . . . . . . . . . . . . Resistance tests involving wiring between the TCM connector and other components adds about one Ohm of resistance to the component resistance shown. . . . . . . . Contact your Allison Transmission represen-tative if you do not have access to the Allison Transmission Extranet. . . . . . Wiring Diagram: Standard "H" Shift Option Model Years Standard.Muncie Power Products is a leading manufacturer of power take-offs (PTO), hydraulic components such as pumps, motors, cylinders, valves and reservoirs, and snow & ice removal products. . . The TCM issues commands to various solenoids in the two valve bodies to govern fluid flow to the clutches (including torque converter clutch). . TESTING FOR OPENS, SHORTS BETWEEN WIRES, AND SHORTS-TO-GROUND, (Use Digital Volt/Ohmmeter J 34520-A and Jumper Wire Set J 39197 or J 39197-A). Transmission Fluid The hard shifting problem is often linked with low transmission fluid levels. This should reduce the transmission and engine temperature to normal operating levels in two to three minutes. . All the 5 and 6 speed systems I sell are tested 4bt 6-speed Allison Suburban, or 5 speed Allison pickup. . . . Minimum value displayed is 00 percent. . . . OUTPUT FUNCTIONS . 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. . INPUT FUNCTIONS . . . . Use the P/N from your appropriate parts catalog or from Appendix E in this manual. . . . . . . . . . Lever Shift Selector . . Failure to do so could cause damage to the internal latching mechanism. Unfortunately, a driver cant reverse limp mode. . . . 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: 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. . . 16. A full-function shift selector has a MODE button and diagnostic display capability through the dual digit vacuum fluorescent (VF) display. . . . 112 B. . . . . * A power take-off (PTO) is optional on the Allison 1000 in the 3500 cab and chassis trucks. . Use the Allison DOC. . . . . . Here are a few potential fixes! . . . . . SCTI recognizes Allison Transmission, manufacturers, and SCTI part numbers. 58 A. . . . . . . . . . . . . . . . Allison, PTO internal leak "from" transmission. . . . . . . NOTE: J 47277 is now included in the J 39197-A Kit. . . . . . clutches are applied to lock the transmission output. A.Control System Prognostics Operation and Display. . . . The Allison Transmission 9000 Series is designed for extreme operating conditions in highly demanding applications up to 1,939 kW (2,600 hp). . . . Always blow or shake any excess cleaner from, the connector before assembling it to its mating connector or hardware. . . . . . . . IDENTIFICATION OF POTENTIAL CIRCUIT PROBLEMS . . . Owning Continue reading Allison Automatic Transmission Wiring . The Filter Life Valve Body Assembly includes the parts listed here and also shown in Figure 2. . . This feature is not available with 7-speed transmission models. . . . USING THE TROUBLESHOOTING MANUAL. . ALLISON TRANSMISSION DIAGNOSTIC TOOL. . . . . . . . . Use the Allison shift selector to review the current status of any of these functions, provided the function being checked is in its specific display mode. . . . . . . . . . Dont keep driving a vehicle with a faulty part! SCTI recognizes AT, manufacturers, and SCTI part numbers. . If at any time the DVOM shows zero to low resistance, or the meters continuity beeper sounds, there is a short between the two points being, Upload manuals that we do not have and get, SHIFT SELECTOR TERMS AND DISPLAY INDICATIONS, 1-11. . . More information on both types of shift selectors is continued below. . . That range will be shown on the shift selector display. . . . . 114, 18. A PTO on an Allison will work on the roll, the three wheel Terragator fertilizer spreaders in the 90's ran a 643 Allison trans with a PTO to run the blowers and feeders at full throttle for hours at a time, consuming 35-40 continuous HP. . . . . . . . . SCTI provides a technical HELPLINE at, Remote 12V or 12/24V Max Feature Sealed Transmission Control Module (TCM), Remote Pushbutton or Lever Shift Selector, Throttle Position Sensor (TPS) or electronic engine throttle data or PWM signal, Engine, Turbine, and Output Speed Sensors, Optional Engine Coolant Temperature Input. . . 31 32. . . . . . The electronic control of the transmission is performed by a microcomputer. . . . . . . . . The root cause of a problem as well as the symptom must be corrected to be sure of trouble-free operation. . Engine speed less than 1200 rpm in all ranges except neutral. . . . . . . . Retarder and engine brakes will not apply when ABS is active. . . . . 1. Do this for both wires in the circuit being tested. When a specified threshold is detected for any of the prognostic functions, the SERVICE TRANS indicator (an open-ended wrench icon located between the range select and range monitor digits in the Allison shift selector) illuminates to alert the operator. . . . . . When disconnecting a harness connector, be sure the pulling force is applied to the connector itself and not the wires extending from the connector. Allison 9000 Series transmissions have up to 8 forward speeds plus a maximum of two reverse . The crates are all stamped with nsn 2520-01-257-3880. . . . . . . . . . . . . . . . . . . . . . Failure to follow these procedures may cause illumination of the CHECK TRANS light and the transmission will be restricted to N (Neutral). . . . . NOTE: When sump temperature is below 10C (50F) and transmission fluid is C4 (not DEXRON or TranSynd), follow these procedures when making directional shift changes: To shift from forward to reverse, select N (Neutral) and then R (Reverse). . . . . . . 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. . . . . . . This momentary lighting shows the light circuit is working properly. 56 B. . . Do troubleshooting at the temperature level where the problem occurs. . . . . . . . . . . . . . . . . . . . . . . Refer to the chart in Appendix Q. . . . Message over the SAE J1939 communication interface. . . The Prognostics Package includes the following functions: Use the Allison DOC For PCService Tool to review the current status of any of these functions and a history of indicator resets. . . . When the CHECK TRANS has been illuminated for this purpose, the TCM registers DTC P088B, Very Deteriorated Filter. . . The rest is in the PCM. . . Also, many different styles and materials for harnesses are likely to be encountered. When the main filter is in an unrestricted state and lockup clutch pressure is applied, the switch is depressurized and in its Normally closed (NC) position which completes a circuit between wire 118 and analog returns wire 158. . . . . . . . . . . Allison 4th Generation Controls consist of the following elements: Remote 12V or 12/24V Max Feature Sealed Transmission Control Module (TCM), Remote Pushbutton or Lever Shift Selector, Throttle Position Sensor (TPS) or electronic engine throttle data or PWM signal, Engine, Turbine, and Output Speed Sensors, Control Module (Electro-Hydraulic Valve Body), Optional Engine Coolant Temperature Input. 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. . . . . . . . . . . Reliable transmission operation and performance depend upon a correctly installed 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 . . Refer to Pages D15 and D16 for VIM wire number and terminal information. Copeland International, Inc. . . . . . . . . . . . Vehicle Interface Module (VIM). . . . . . . will cause severe overheat damage to the transmission. . . New animated screen by screen help support (found in Help. Multiple sources can be detected on a single engine start cycle. . . . All Rights Reserved. . . . . . . . . . . . . However, this manual does provide a starting point from which most problems can be resolved. . Throttle Position Sensor (Without Mounting Brackets). . . . . Strip pushbutton shift selectors are used primarily by non-North American OEMs. . Also, be aware of other interlocks that would prevent attaining D (Drive) or R (Reverse). . . Figure 21. . Examples are wheelchair lift not stored and service brakes not applied (service brake interlock present). . 16 15. . . . . . . . . . . . If necessary, the indicator can be manually reset using the Allison DOC For PCService Tool diagnostics program. . . . . . . Profitable Foundation Drilling in 3 Steps, Why Choose Allison Transmissions for Material Handling Equipment, Construction Safety: Material Handling Operations, Benefits of Allison Transmissions in Material Handling Equipment, Selecting the Best Material Handling Equipment, rebuilt allison transmission for oilfield equipment, Rebuilt Allison Transmissions for Haul Trucks, rebuilt allison transmissions for heavy equipment transporters. . PTO Neutral Lockup. . . Minimum Fluid Operating Temperatures. . . . After the OLS circuit is repaired, reset autodetect or manually select the OLS function using the Allison DOC For PCService Tool. . . The Transmission Rebuilders Network is the place where the industries best transmission rebuilders work together to help solve the most complex automatic transmission problems. . . . . . . . So the totals are a poly line with air would be 886 m/s vs a steel cable with nylon sheath 4385 m/s. Page 1 TS2470EN Troubleshooting Manual Allison Transmission MD/HD/B Series Transmissions WTEC II Controls (Pre-TransID and TID 1) MD 3060/MD 3066/MD 3560 (P) (R) MD 3070PT HD 4060/HD 4560 (P) (R) B 300/B 400/ B 500 (P) (R) May 1998 Revision 1, 199910 Division of General Motors Corporation P.O. . Additionally, OLS detection must occur within 12.5 seconds on any given engine start. . . . . . . . . . If the replacement TCM corrects the original complaint, reinstall the original TCM to verify that the complaint returns. . . . . . . . . . . Allison Transmission Troubleshooting Download ALLISON 1000/2000/24000 SERIES ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL DTC/Description P0121 Pedal Postion Sensor Performance Problem P0122 Pedal Postion Sensor Circuit Low Voltage P0123 Pedal Postion Sensor Circuit High Voltage P0218 Transmission Fluid Over Temperature P0562 System Voltage Low . . . With the ignition ON and the engine OFF, shift between N D N D N R N, pausing briefly (less than 3 seconds) between shifts, to reset the value displayed on the shift selector to 99 percent. . . . . The full-function pushbutton shift selector has. . . . . 2023 Copeland Allison Transmissions . . . . . . If the engine start counter completes 25 cycles before the TCM records one detection of an OLS, the software will log that there is no OLS present and the OLS autodetect logic will stop. 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