Allison
Allison WTEC II Fault Code: 52 PID: SPN: 99 FMI: Offgoing C3PS test (during shift), N3 to N2
Posted by PerDiezel Solutions on
Main code 52 indicates a failed C3 pressure test. N3?N2 shift When a shift is commanded and C3 is the offgoing clutch, the ECU expects the C3 pressure switch to open within a period of time after the shift is commanded. If the ECU does not see the switch open, it assumes C3 has not released. If conditions for a shift exist, the shift is retried. If theC3 pressure switch still remains closed, the code is logged and the DO NOT SHIFT response is commanded. If the code is set during a direction change, neutral with no clutches is commanded,...
Allison WTEC II Fault Code: 52 PID: SPN: XY FMI: Offgoing C3PS test, X to Y
Posted by PerDiezel Solutions on
Main code 52 indicates a failed C3 pressure test. X to Y shift When a shift is commanded and C3 is the offgoing clutch, the ECU expects the C3 pressure switch to open within a period of time after the shift is commanded. If the ECU does not see the switch open, it assumes C3 has not released. If conditions for a shift exist, the shift is retried. If theC3 pressure switch still remains closed, the code is logged and the DO NOT SHIFT response is commanded. If the code is set during a direction change, neutral with no clutches...
Allison WTEC II Fault Code: 53 PID: SPN: 08 FMI: Offgoing speed test (during shift), L to N1
Posted by PerDiezel Solutions on
Main code 53 indicates a failed offgoing speed test. L?N1 shift The speed test during a shift is designed to ensure neutral is attained during shifts to neutral. This test compares engine speed to turbine speed. If neutral is selected and turbine speed is found to be much lower than engine speed, the ECU sees this as neutral not being attained. The transmission is commanded to Neutral with No Clutches and Code 53 XX is set. Additional codes could be logged for other shifts where ?X? indicates the range from and ?Y? indicates the range to. Allison WTEC II Fault...
Allison WTEC II Fault Code: 53 PID: SPN: 09 FMI: Offgoing speed test, Low to NNC
Posted by PerDiezel Solutions on
Main code 53 indicates a failed offgoing speed test. Low?NNC shift The speed test during a shift is designed to ensure neutral is attained during shifts to neutral. This test compares engine speed to turbine speed. If neutral is selected and turbine speed is found to be much lower than engine speed, the ECU sees this as neutral not being attained. The transmission is commanded to Neutral with No Clutches and Code 53 XX is set. Additional codes could be logged for other shifts where ?X? indicates the range from and ?Y? indicates the range to. Allison WTEC II Fault...
Allison WTEC II Fault Code: 53 PID: SPN: 18 FMI: Offgoing speed test (during shift), 1 to N1
Posted by PerDiezel Solutions on
Main code 53 indicates a failed offgoing speed test. 1?N1 shift The speed test during a shift is designed to ensure neutral is attained during shifts to neutral. This test compares engine speed to turbine speed. If neutral is selected and turbine speed is found to be much lower than engine speed, the ECU sees this as neutral not being attained. The transmission is commanded to Neutral with No Clutches and Code 53 XX is set. Additional codes could be logged for other shifts where ?X? indicates the range from and ?Y? indicates the range to. Allison WTEC II Fault...
