Eaton Fuller Advantage (2017) Fault Code: 27 PID: SPN: 522 FMI: 7 Clutch Disengagement: Mechanical System Not Responding - EcuForce Truck (2024)

Overview:
The Fuller Advantage Transmission receives torque input through the clutch. The amount of torque being transferred through the clutch is controlled by the Electronic Clutch Actuator (ECA), which moves the Clutch Yoke, thereby opening and closing the clutch. The Transmission Electronic Control Unit (TECU) monitors engine speed and Input Shaft speed to determine proper clutch operation. The TECU sends requests to the ECA to open or close the clutch during vehicle operation. If the ECA position is below the required value or the Input Shaft speed indicates a lack of separation from engine speed with the clutch commanded open, the system sets Fault Code 27.

Detection:
The system can detect clutch disengagement faults under the following conditions:
• TECU indicates the ECA is open but the Input Shaft speed has not separated from engine speed.
• Inertia Brake Touch Point Delta (IBkTp Delta) value is below the required value.

Conditions to Set Fault Code Active:
FMI 7 – Mechanical System Not Responding: TECU detects clutch disengagement faults when one of the following conditions occurs:
• Clutch Adjustment not performed after a new TECU installed.
• The transmission detects the Low Capacity Inertia Brake (LCIB) has not slowed the Input Shaft when applied. This is defined as Input Shaft speed within 50 RPM of engine speed for 1 second while the LCIB is applied.
• The transmission detects torque and Input Shaft speed when the clutch is being held open. This is defined as calculated engine torque greater than 400 N•m and Input Shaft speed within 50 RPM of engine speed for 1 second.
• Inertia Brake Touch Point Delta (IBkTp Delta) value is less than the default of 16° (as seen in
ServiceRanger under “Vehicle Data Monitor”).

Fallback:
FMI 7
• “F” flashes in gear display.
• Service light flashes (if equipped).
• Transmission may not engage a gear from neutral.
• Transmission may not attempt to shift.

Conditions to Set Fault Code Inactive:
FMI 7: The system sets the fault code Inactive under the following conditions:
• Clutch Adjustment completed after a new TECU installed.
• Input Shaft speed and engine speed differ by greater than 50 RPM for 1 second.
• Inertia Brake Touch Point Delta (IBkTp Delta) goes above 16°.

Possible Causes:
FMI 7
1) Engine
– Excessive Crankshaft play
2) Clutch
– Clutch not calibrated
– Over-adjustment
– Excessive abuse or damage
– Release Bearing failure
– Lack of lubricant in Release Bearing or Cross Shaft Assembly
– Improper removal or installation
– Shipping bolts not removed during installation
3) Input Shaft
– Excessive wear or damage
– Pilot Bearing failure
4) ECA
– Internal failure

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