Eaton Fuller Hybrid Transmission Fault Code 64 – ECA Fault

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 connected to the 12-volt battery and an 8-Way Connector connected to inputs such as 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 64 – ECA Fault Detection

The following preconditions must be met before the system detects the fault:

  • ECA ignition voltage is greater than 8.5 volts.
  • ECA Battery Voltage is greater than 7.8 when ignition voltage is greater than 8.5 volts.

Note: When troubleshooting an Inactive code refer to the Product Diagnostic Mode (PDM)

Conditions to Set Fault Code Active

  • FMI 12 is set for various internal ECA failures.
  • FMI 22–28 can be set for excessive motor current, excessive motor temperature, or incorrect motor position.
  • FMI 0 is set when the ECA Inverter temperature exceeds 266 °F (130 °C).
  • FMI 13 is set when the ECA can not find the Clutch Release Bearing touch point after 3 attempts.

Fallback When Fault Code 64 is set the following conditions occur:

  • Red “Stop Hybrid” light illuminates for FMI 12, 21, 22, 23, 24, 26, 27, or 28.
  • Amber “Check Hybrid” light illuminates for FMI 0, 13, or 25.
  • Fault is stored in HCM memory.
  • If the fault occurs while driving, the ECA either maintains current clutch position or moves to the last position commanded by the HCM.
  • If the fault occurs at power up, the vehicle does not crank.

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 12
    • ECA
  • FMI 21–28
    • Excessive debris buildup on/around the ECA.
    • Damaged exhaust heat shielding near ECA.
    • Binding cross-shafts.
  • FMI 0
    • Missing exhaust shield or exhaust to close to ECA.

Fault Code 64 – ECA Fault Test

Warnings & Cautions

Danger: Danger indicates you will be severely injured or killed if do not follow the indicated procedure.
Warning: Warning indicates an immediate hazard, which could result in severe personal injury if you do not follow the indicated procedure.
Caution: Caution indicates vehicle or property damage could occur if you do not follow the indicated procedure.

Note: Note indicates additional detail that will aid in the diagnosis or repair of a component/system.

Follow the specified procedures in the indicated order to avoid personal injury:

1. If the high-voltage cones are around the vehicle and the lockout is installed on the PEC, the only person that should be allowed to start the vehicle is the person who signed the lockout tag.
2. Before working on a vehicle or leaving the cab while the engine is running, you should place the shift lever in “N” set the parking brake, and block the wheels.
3. For safety reasons, always engage the service brakes prior to selecting gear positions from “N.”
4. Before starting a vehicle always be seated in the driver’s seat, select “N” on the shift control, and set the parking brakes.
5. In vehicles with ePTO, the engine and/or
Motor/Generator can start in ePTO mode. Never perform any maintenance or work on vehicle, while in this mode.
6. 12-Volt Battery positive (+) and negative (-) must be disconnected prior to any welding on any Hybrid equipped vehicle.

Caution: Follow the specified procedures in the indicated order to avoid equipment malfunction or damage.
Caution: Do not release the parking brake or attempt to select a gear until the air pressure is at the correct level.
Caution: To avoid damage to the transmission during towing place the shift lever in “N” and lift the drive wheels off the ground or disconnect the driveline.

High-Voltage Warnings & Cautions

  • Use CO2 or Dry Chemical Fire Extinguishers.
  • The high-voltage wiring is covered in orange insulation or convoluted tubing and marked with warning labels at the connectors.
  • All Eaton® Hybrid Diesel/Electric vehicles will be marked ‘Hybrid’ on the outside of the vehicle, along with the shift label on the dash.
  • Refer to OEM for specific location of chassis mounted hybrid components.
  • Do NOT cut into the orange high-voltage cables.
  • Do NOT cut into or open the PEC.
  • Do NOT cut into or open the DC/DC Converter.
  • Do NOT cut into or open the Inverter.

A buffer zone must be set up and high-voltage insulated rubber gloves (class 0 with leather protectors) are required prior to working on high-voltage. Failure to follow these instructions may result in severe personal injury or death.
The rubber-insulated gloves that must be worn while working on the high-voltage system are class 0 with leather protectors. The rubber gloves should be tested before EVERY use following the rubber insulation gloves testing procedure found in “Diagnostic Tools/Service Publications” on page 6. Failure to follow these instructions may result in severe personal injury or death.
Before inspecting or working on any high-voltage cables or components the “High-Voltage Service Shutdown and Power-Up Procedure” on page 4 should be followed. Failure to follow these instructions may result in severe personal injury or death.
The Lockout and Tagout devices should only be removed by the technician that placed the Lockout and Tagout devices on the vehicle. Failure to follow these instructions may result in severe personal injury or death.
High-voltage rubber insulated gloves (class 0 with leather protectors) must be worn when working on any
high-voltage cables. The “High-Voltage Service Shutdown and Power-Up Procedure” on page 4 must be followed prior to removing any high-voltage cables. Failure to follow these instructions may result in severe personal injury or death.
High-voltage cables and wiring are orange and contain a warning label at the connectors. High-voltage components are marked with a label. High-voltage rubber insulated gloves (class 0 with leather protectors) must be used when working on any of these components. Failure to follow these instructions may result in severe personal injury or death.

High-Voltage Service Shutdown Procedures

High-Voltage Service Shutdown and Power-Up Procedure1. Follow “High-Voltage Work Area” procedure.
2. Locate the red PEC Service Switch on the front of the PEC and push switch off.
3. Remove the Service Switch Cover and install the Lockout Bracket (J48506).
4. Fasten tag to the Lockout Bracket.
5. Ensure the PEC Service Switch can not move from the off position.
6. Allow the system to set for a minimum of 5 minutes to discharge high voltage.
7. Connect ServiceRanger and view the Data Monitor PID 116 called “High-Voltage Battery Potential.” Use SPN 520323 for J1939 connection “Battery Voltage RB” (Relay Box).
8. The voltage should be 30 volts or less. If the voltage is above 30 volts, do not work on the vehicle and contact Eaton® at 1-800-826-HELP (4357).
9. Turn ignition key off and proceed to repair or troubleshooting step.
Note: The voltage drops to zero when the key is off.

High-Voltage Service Power-Up Procedure

1. Install all high-voltage connectors into their locked positions.
2. If you are the person working on the vehicle, remove the Lockout Bracket and tag.
3. Reinstall the Lockout Bracket over the Service Switch.
4. Pull the Service Switch out and let vehicle set for 2 minutes.
5. Start vehicle when appropriate.

Eaton Hybrid Component and Connector Location

Eaton Hybrid Component and Connector Locations MY08 Systems

Eaton Hybrid Component and Connector Location MY09 Systems

Eaton Hybrid Component and Connector Locations MY09 Systems

STEP 1. Verify FMIs present.

  1. Retrieve Active fault codes and FMIs with ServiceRanger using the 9-Way Diagnostic Connector.
  2. Key off.
  3. Disconnect negative battery cable.
  4. Which FMIs are present?
    • If FMI 0 is present, check for damaged or missing exhaust shielding on the ECA. Replace or reroute exhaust to reduce internal ECA temperature, then go to Step 4.
    • If FMI 12 is listed, replace the Electric Clutch Actuator (ECA), then go to Step 4.
    • If FMI 21–28 are listed, go to Step 2.

STEP 2. Verify integrity of ECA Motor.

  1. Check the ECA for any debris build-up, damaged exhaust, or missing Exhaust Heat Shields near the ECA:
    • ECA has no debris build-up or damaged exhaust by the unit, go to Step 3.
    • ECA has debris build-up or exhaust damage next to the unit, remove the debris build-up, or repair the exhaust damage, then go to Step 4.

STEP 3. Verify no binding on Cross-Shafts.

  1. Disconnect the ECA 8-Way and 3-Way Connectors.
  2. Remove the ECA.
  3. Rotate the Cross-Shafts by grabbing the exposed Lower Cross-Shaft and rotating it:
    • If the Cross-Shafts rotate without any binding, replace the Electric Clutch Actuator (ECA), then go to Step 4.
    • If the Cross-Shafts bind when rotated, replace the Cross-Shafts and Bushings, then go to Step 4.

STEP 4. Verify repair.

  1. Key off.
  2. Key on.
  3. Clear codes, see Clear Inactive Faults.
  4. Reconnect all connectors and the negative battery cable.
  5. Drive the vehicle and attempt to reset the code.
  6. Check for codes, see View Active and Inactive Faults.
    • If no codes, test is complete.
    • If fault Code 64 appears, find error in testing, go to Step 1.
    • If a code other than 64 appears, see Fault Code Index List.

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