Fault Code 27: Clutch Disengagement
J1587: MID 130SID 55FMI 7, 13
J1939: SA 3SPN 522FMI 7, 13
Overview
The UltraShift PLUS 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 ECAposition is below the required value or the Input Shaft speed indicates a lack of separation from engine speed withthe clutch commanded open, the system sets FaultCode 27.
The system can detect clutch disengagement faults under the following conditions:Detection
Conditions to Set Fault Code Active
FMI 7 – Mechanical System Not Responding: TECU detects clutch disengagement fault when one of the following conditions occurs: FMI 13 – Out of Calibration: A Clutch Calibration is required.
All FMIs Fallback
Conditions to Set Fault Code Inactive
FMI 7: The system sets the fault code Inactive under the following conditions: FMI 13:
Possible Causes
FMI 7 FMI 13
Eaton ECA Clutch 1. Clutch Wear Tab 2. Release Bearing 3. Release Bearing Grease ZerkComponent Identification
Fault Code 27 Troubleshooting
A Purpose:Check for Active or Inactive fault codes. Set parking brake and chock wheels. Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure. Note: The Adjust Clutch (Clutch Calibration) Service Routine is only required after completing an In-Vehicle Reset Procedure, replacing the Heavy-Duty ECA Clutch or installing a new TECU. If Fault Code 27 FMI 7 is Active and the ECA was just reinstalled or replaced, go to TAIB-0996 Fault Code 27 FMI 7 and/or 64 FMI 7 Set Active After ECA Installation. If Fault Code 27 FMI 7 is set and a new TECU was just installed, Go to Step F If Fault Code 64, 66 or 67 is Active, troubleshoot per Fault Code Isolation Procedure Index. If Fault Code 27 FMI 7 is set and a new TECU was not just installed, Go to Step B If Fault Code 27 FMI 13 is Active, Go to Step F If Fault Code 27 FMI 13 is Inactive, a Clutch Calibration has been performed. Clear fault codes using ServiceRanger, test complete. B Purpose:Inspect condition of clutch. Key off. Remove single bolt for clutch housing access cover. Inspect for excessive clutch dust, broken clutch or spring material, or other signs of clutch failure. Ensure Release Bearing and Cross Shaft are properly greased per Heavy-Duty Clutch Service Manual (CLSM0200). If no issues are found and properly greased, Go to Step C If physical signs of a clutch failure are present, replace Heavy-Duty ECA Clutch. Go to Step V C Purpose:Check wear tab position on the Heavy-Duty ECA Clutch. Key off. Check the Wear Tab position located on the clutch cover assembly. Caution The Heavy-Duty ECA Clutch must always be caged (shipping bolts installed) while installing or removing the clutch. If clutch is not caged properly, permanent damage will occur. Replacement will be required. See the Heavy-Duty Clutch Service Manual (CLSM0200) for proper removal and installation procedures. Notice Issues such as Pilot Bearing failures, excessive torsional vibration, excessive Flywheel run-out or clutch abuse can cause premature clutch failures. It is recommended that the Pilot Bearing be replaced whenever the clutch is replaced. Refer to the Eaton UltraShift® PLUS Transmission Installation Guide (TRIG1110) for a list of recommended Pilot Bearings. Refer to CLIB-0036 for replacement criteria of the LCIB during clutch replacement. If Wear Tab is in the “Replace” position, replace Heavy-Duty ECA Clutch. Go to Step V If Wear Tab is not in the “Replace” position, Go to Step D D Purpose:Verify Clutch Inertia Brake Touch Point Delta using ServiceRanger. Key on with engine off. Connect ServiceRanger. Go To “Data Monitor”. From the “Default Parameter Files” tab, select “J1939 Clutch Actuator”. Monitor 520214 - Clutch inertia brake TP delta. Record reading in table. Notice Engine crankshaft end play above the manufacturer's specification can affect Clutch Inertia Brake TP Delta Value. Ensure the engine is not experiencing symptoms that indicate excessive crankshaft end play. Compare reading(s) in table. If Clutch Inertia Brake TP Delta Value is less than 16.5° (degrees), retrieve Snapshot and VPA data by creating a Service Activity Report within ServiceRanger and select “Send to Eaton”. Go to Step E If Clutch Inertia Brake TP Delta Value is equal to or greater than 16.5° (degrees), retrieve Snapshot and VPA data by creating a Service Activity Report within ServiceRanger and select “Send to Eaton”. Replace the Electronic Clutch Actuator (ECA), Go to Step V E Purpose:Measure release bearing and Low Capacity Inertia Brake distance. Through the clutch housing access cover, compress and hold the Low Capacity Inertia Brake (LCIB) with a pry bar. Note: The LCIB is required to be compressed while measuring the distance between the release bearing and LCIB. Measure the distance between the release bearing (1) and LCIB (2). Record measurement in table. Compare reading(s) in table. If reading is less than 0.490 inches (12.45 mm), replace the Heavy-Duty ECA Clutch, Go to Step V If reading is equal to or greater than 0.490 inches (12.45 mm), replace the Electronic Clutch Actuator (ECA), Go to Step V F Purpose:Perform Adjust Clutch (Clutch Calibration) Service Routine with ServiceRanger. Key on. Connect ServiceRanger. Go To “Service Routines”. Select “Start” Adjust Clutch and follow on-screen prompts. Key off. Note: Allow 2–3 minutes for the TECU to perform a complete power-down sequence before proceeding. Key on. Connect ServiceRanger. Retrieve and record the transmission fault codes and FMIs and their occurrences and timestamps. If Fault Code 27 is Inactive, Clutch Calibration is complete. Clear fault codes using ServiceRanger, test complete. If Fault Code 27 FMI 7 is Active, Go to Step B V Purpose:Verify repair. Key off. Reconnect all connectors and verify that all components are properly installed. Key on with engine off. Clear fault codes using ServiceRanger. Drive vehicle and attempt to reset the code or duplicate the previous complaint. Check for fault codes using ServiceRanger. If no fault codes set and vehicle operates properly, test complete. If Fault Code 27 sets Active during the test drive, Go to Step A If a fault code other than 27 sets, troubleshoot per Fault Code Isolation Procedure Index.Parameter Range Reading(s) 520214-Clutch inertia brake TP delta 16.5° Release Bearing and LCIB Distance Measurement 0.490” (12.45 mm)