Eaton Gen 2 (AutoShift) Fault Code: 28 PID: SID 52 FMI: 5 Clutch System Fault
Overview
Fault Code 28 indicates either an electrical or mechanical failure in the wet clutch system.
Detection:
1) Starting at key on and throughout operation, the Transmission Controller constantly monitors this circuit. A failure of short to battery, short to ground or open circuit sets the fault code Active.
2) When the wet clutch is locked after urge to move, engine speed and Input Shaft speeds are compared. If the engine speed is significantly higher than the Input Shaft speed for a period of 5 seconds, the wet clutch is slipping.
Fallback:
There is no fallback mode; however, if the failure mode is open circuit, the engine will be disengaged from the Input Shaft.
Possible Causes:
1) Transmission Controller
2) Transmission Harness
3) Low fluid level
4) Wet clutch system
Shop Talk:
Key on. If the fault is present, the system should automatically detect the problem and set the code. If the fault is not present at key on, operate the vehicle and attempt to duplicate the driving conditions that triggered the fault code. Possible triggers include low clutch fluid level, heat and vibration.
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