Fault code for Eaton Hybrid Drive Systems models (MY08) EH-8E306A-U, EH-8E306A-UPG, EH-8E306A-UP, EH-8E306A-CD, EH-8E306A-T, EH-6E606B-CD, (MY09) EH-8E406A-U/P, EH-8E406A-UP, EH-8E406A-UPG, EH-8E406A-CD, EH-8E406A-CDG, EH-8E406A-CDR, EH-8E406A-T, EH-6E706B-CD, EH-6E706B-P and EH-6E706B-UPG. Read below to learn how to test, clear and fix fault code errors for your Freightliner, Mack, Peterbilt, Kenworth, Volvo, International, and heavy-duty truck and equipment. The Electric Clutch Actuator (ECA) controls the position of the clutch assembly. The ECA has a main power 3-Way Connector that is directly connected to the 12-Volt Battery and an 8-Way Connector that is connected to inputs like the Hybrid Control Module (HCM) and the Engine Speed Sensor. The ECA communicates with the HCM over the proprietary Controller Area Network (CAN) data link to change position, show faults, or include other operation information.
Fault Code 65 – ECA Speed Sensor Detection
The following preconditions must be met before the system detects the fault:
- ECA ignition voltage is greater than 8.5 volts.
- Fault Code 18 or 87 are Active.
Note: When troubleshooting an Inactive code refer to the Product Diagnostic Mode (PDM)
Conditions to Set Fault Code Active
- FMI 2 is set when the HCM detects engine speed at idle, but does not detect ECA engine speed.
- FMI 5 is set when the ECA detects an open on the ECA Speed Sensor signal circuit at key on.
Fallback When Fault Code 65 is set the following conditions occur:
- Amber “Check Hybrid” light illuminates.
- Fault is stored in Hybrid Control Module (HCM) memory.
Conditions to Set Fault Code Inactive
Only Inactive faults can be cleared from the Transmission Electronic Control Unit (TECU) or HCM history using ServiceRanger. The TECU automatically clears the faults from history after 200 hours and the HCM automatically clears the faults from history after the fault has been Inactive for 200 hours.
This fault code can be caused by any of the following:
- FMI 2, 5
- ECA Speed Sensor
- ECA Speed Sensor Harness