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Here is the solution for Allison 3000 & 4000 Gen5 fault code P0218 transmission fluid over temperature condition.
DIAGNOSTIC RESPONSE:
Use default sump temp
For more Diesel machine repair,please refer to:
2023 Diesel DTC Solutions V2.9.98+ Diesel Explorer 2.0+Instruction
CIRCUIT DESCRIPTION:
The Transmission Fluid Temperature (TFT) sensor is incorporated into the internal wiring harness and measures the sump temperature. The TFT sensor changes its resistance value based on the temperature of the transmission fluid. This test detects high transmission fluid temperature.
ACTION TAKEN WHEN THE DTC SETS:
When DTC P0218 is active, the following conditions occur:
1 The TCM does not iluminate the CHECK TRANS light.
2 DTC is stored in TCM history.
3 The TCM freezes shift adapts (DNA).
4 TCM defaults to hot mode shift schedule. The hot mode shift schedule limits transmission to no higher than fourth range and TCC (lockup) is inhibited to increase engine speed and improve cooler flow. In addition, if the transmission is above 4th range when an over-temperature occurs, the preselect shift schedule is used for all downshifts until 4th range is reached.
CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LGHT:
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.
The DTC goes inactive and the TCM cancels the DTC active actions when the TFT sensor signals that the fluid temperature is below 121
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