Allison WTEC II Fault Code: 25 PID: SPN: 11 FMI: Output speed sensor, detected at 0 output rpm, 1st

Main code 25 occurs if the output speed sensor reports a zero speed reading while both engine and turbine speeds are approximately equal, turbine speed is above a calibration value, and neutral is not selected or commanded.

Possible Causes:
1. Output speed sensor has failed
2. The required oncoming clutch or clutches did not come on.

Code 25 11 can be generated by a false turbine speed reading. This may be due to crosstalk between solenoid and turbine speed sensor circuits caused by direct wire-to-wire short or by water in the electrical connectors.

Related

Categories Allison, DTC TRUCKS, WTEC II Tags 0, 11, 1st, 25, Allison, at, Code, Detected, Fault, FMI, II, Output, PID, rpm, Sensor, Speed, SPN, WTEC

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