Here is the instruction show you guide on how to solve Allison 3000 & 4000 Gen TCM Internal Temperature Tool high P0634 trouble code error.
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2023 Diesel DTC Solutions V2.9.98+ Diesel Explorer 2.0+Instruction
2024 2019 Allison DOC Transmission Diagnostic Software Free Download
DIAGNOSTIC RESPONSE:
SOL OFF (hydraulic default)
CIRCUIT DESCRIPTION:
The TCM is equipped with an internal temperature sensor mounted directly to its circuit board. The TCM takes action to protect against damage from overheating.
ACTION TAKEN WHEN THE DTC SETS:
1 The TCM does not illuminate the CHECK TRANS light.
2 DTC is stored in the TCM history.
3 The TCM commands OFF all solenoids (SOL OFF).
4 TCM shutdown.
CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LIGHT:
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:
DTC P0634 may be caused by:
1 Defective TCM.
2 Debris on TCM.
3 External heat source such as vehicle exhaust in vicinity of TCM.
Clean the TCM if necessary. Excessive road debris will reduce the effectiveness of the heat sink on the TCM and could cause internal temperature to rise.
TCM Substrate Temperature is available on the diagnostic tool Data Monitor grid. Prior to ‘Connect’ for the diagnostic tool, check the ‘Troubleshoot Specific Problem’ box under “Connection Options” and then check the ‘Sensor, Voltage, Ohms, and Counts Data box.
Review applicable information in CONTROL SYSTEM AND TRANSMISSION SPECIFICATIONS to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.
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