Overview:
This code indicates an electrical problem in the main shaft speed sensor circuit. The signal from the sensor did not match the current operating conditions.
Detection:
A Speed Sensor is determined faulty when all the Speed Sensor readings are compared and one sensor is inconsistent.
Fallback:
There is no fallback mode, because Main Shaft speed can be calculated from output shaft speed (may slow down shifting).
Required Tools:
1) Basic Hand Tools
2) Digital Volt/Ohm Meter
3) AutoSelect/AutoShift Troubleshooting Guide
Possible Causes:
1) Loose speed sensor
2) Contaminated sensor end
3) Damaged transmission harness
4) Malfunctioning main shaft speed sensor
5) Malfunctioning transmission ECU
Eaton Gen 1 (AutoShift) Fault Code: 56 PID: PID 161 FMI: 2 Input Shaft Speed Sensor
Eaton Gen 1 (AutoShift) Fault Code: 53 PID: SID 34 FMI: 2 Reverse Ball Switch
Eaton Gen 1 (AutoShift) Fault Code: 52 PID: PID 59 FMI: 2 Gear Select Sensor
Eaton Gen 1 (AutoShift) Fault Code: 51 PID: PID 60 FMI: 2 Rail Select Sensor
Eaton Gen 1 (AutoShift) Fault Code: 46 PID: SID 38 FMI: 4 Splitter Solenoid Valve
Eaton Gen 1 (AutoShift) Fault Code: 46 PID: SID 38 FMI: 4 Splitter Solenoid Valve