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

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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