This Fault Code 27 clutch disengagement reference is the official Eaton Fuller Advantage Heavy Duty document (publication TRTS0980) describing how the transmission detects a clutch that fails to separate. The 2-page PDF explains that torque is controlled by the Electronic Clutch Actuator (ECA) and that the TECU monitors engine speed and Input Shaft speed to confirm proper operation.
Fault Code 27 clutch document details
| Brand | Eaton |
|---|---|
| Model coverage | Fuller Advantage Heavy Duty and Fuller Advantage |
| System / Group | DTCs / Fault Isolation Procedures |
| Publication no. | TRTS0980 |
| Year / Revision | 2016.06.20 (© 2016 Eaton) |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document sections and coverage
- Overview of ECA and Clutch Yoke operation (J1587: MID 130 SID 55)
- Detection when the ECA is open but Input Shaft speed has not separated
- Conditions to set Active (FMI 7 – Mechanical System Not Responding)
- Inertia Brake Touch Point Delta (IBkTp Delta) below the default of 16°
- Fallback behavior and a full list of possible causes
Applicable transmissions and clutch
The reference covers Fuller Advantage Heavy Duty transmissions using the Electronic Clutch Actuator, Release Bearing and Low Capacity Inertia Brake (LCIB). It notes triggers such as calculated engine torque greater than 400 N•m with Input Shaft speed within 50 RPM of engine speed for one second. Listed causes span excessive crankshaft play, a clutch that is not calibrated or over-adjusted, release-bearing failure and shipping bolts left in during installation. Manufacturer data is published on Eaton’s official Roadranger website.
Who needs this Fault Code 27 clutch manual
Driveline technicians and workshop owners diagnosing a clutch that will not disengage, or a code set after a new TECU installation, use this manual to confirm whether a clutch adjustment or replacement is required. The document also lists the conditions that set the code Inactive once the IBkTp Delta rises above 16 degrees.
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