Here is a solution for Allison 3000 & 4000 Gen 5 P0614 torque control mismatch ECM/TCM trouble repair.
DIAGNOSTIC RESPONSE:
Allows operation only in reverse and second range
For more Diesel machine repair,please refer to:
2023 Diesel DTC Solutions V2.9.98+ Diesel Explorer 2.0+Instruction
CIRCUIT DESCRIPTION:
Shift Energy Management (SEM) allows the TCM to request torque reduction from the engine controller. By reducing torque, shifts can be made quicker and at a more consistent output torque, which reduces clutch temperatures allowing increased clutch life. When an engine torque rating exceeds certain limits, Low Range Torque Protection (LRTP) is used. This feature limits engine torque in lower ranges to protect the transmission from damage if a stall condition occurs.
This test detects:
1 If a high-rated engine (as determined by the selection of transmission calibration) supports SEM/LRTP as required.
2 If the engine rating (as broadcast by SAE J1939 Advertised Engine Torque Curve (AETC)) is acceptable for the transmission.
For high torque applications, the engine must support the required messages to allow SEM and LRTP. For low torque applications, SEM may or may not be active.
ACTION TAKEN WHEN THE DTC SETS:
1 The CHECK TRANS light iluminates.
2 DTC is stored in the TCM history.
3 The TCM allows operation in Reverse (R), Neutral (N), and Second (2nd) range only.
4 The TCM freezes shift adapts (DNA).
5 The TCM inhibits TCC engagement.
6 DTCs P2637 and/or P2641 may also be active.
CONDITIONS FOR CLEARING THE DTC:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without the DTC recurring.
DIAGNOSTIC AIDS:
1 Incorrect engine calibration.
2 Incorrect transmission calibration.
3 Engine calibration that does not support all required SAE J1939 SEM/LRTP messages.
4 Communication link problem.
5 Defective TCM.
Review applicable information in the OEM Technician’s Library, GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS -SHIFT SEL ECTOR ISSUES or CONTROL SYSTEM AND TRANSMISSION SPECIFICATIONS, and other related information.
More Allison repair case,please refer to Allison Trouble Repair