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Allison

Allison WTEC II Fault Code: 25 PID: SPN: 44 FMI: Output speed sensor, detected at 0 output rpm, 4th

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.

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Allison WTEC II Fault Code: 25 PID: SPN: 55 FMI: Output speed sensor, detected at 0 output rpm, 5th

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.

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Allison WTEC II Fault Code: 25 PID: SPN: 66 FMI: Output speed sensor, detected at 0 output rpm, 6th

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.

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Allison WTEC II Fault Code: 25 PID: SPN: 77 FMI: Output speed sensor, detected at 0 output rpm, Reverse range

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 cluth or cluthes did not come on.

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Allison WTEC II Fault Code: 32 PID: SPN: 00 FMI: C3 pressure switch open in low range

Main code 32 indicates the transmission gear ratio is correct, but the C3 pressure switch is open when it should be closed.

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Allison WTEC II Fault Code: 32 PID: SPN: 33 FMI: C3 pressure switch open, 3rd range

Main code 32 indicates the transmission gear ratio is correct, but the C3 pressure switch is open when it should be closed.

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Allison WTEC II Fault Code: 32 PID: SPN: 55 FMI: C3 pressure switch open, 5th range

Main code 32 indicates the transmission gear ratio is correct, but the C3 pressure switch is open when it should be closed.

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Allison WTEC II Fault Code: 32 PID: SPN: 77 FMI: C3 pressure switch open, Reverse range

Main code 32 indicates the transmission gear ratio is correct, but the C3 pressure switch is open when it should be closed.

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Allison WTEC II Fault Code: 33 PID: SPN: 12 FMI: Sump oil temperature sensor, failed low

Main code 33 indicates the sump temperature sensor is providing a signal outside the usable range of the ECU. This code indicates the sensor failed showing abnormally low temperature readings.

Main code 33 Causes:

1. Component or circuit failure
2. Extremely high or low temperatures.

There are no operational inhibits related to main code 33. The ECU assumes a hardware failure and that transmission temperatures are normal (93oC; 200oF). Temperatures above or below normal cause poor shift quality.

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Allison WTEC II Fault Code: 33 PID: SPN: 23 FMI: Sump oil temperature sensor, failed high

Main code 33 indicates the sump temperature sensor is providing a signal outside the usable range of the ECU. Main code 33 can be caused by a component or circuit failure or by extremely high temperatures.

Main code 33 Causes:

1. Component or circuit failure
2. Extremely high or low temperatures.

There are no operational inhibits related to main code 33. The ECU assumes a hardware failure and that transmission temperatures are normal (93oC; 200oF). Temperatures above or below normal cause poor shift quality.

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