UltraShift PLUS
TRTS0940 EN-US
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July 2024 - A

Fault Code 64: Gen2 Electronic Clutch Actuator (ECA)

J1587: MID 130 PID 34 FMI 2, 7, 12

J1939: SA 3 SPN 788 FMI 2, 7, 12

Overview

The UltraShift PLUS transmission equipped with an Electronic Clutch Actuator (ECA) that controls the position of the clutch assembly. Power and ground to the ECA are OEM-supplied through a 2-Way Gen2 ECA Connector directly connected to the vehicle batteries. The ECA is connected to the TECU by an 8-Way Gen2 ECA Connector that is part of the transmission harness. The ECA communicates with the TECU over the High Integrity Link (HIL) to change position, show faults or include other operation information. Fault Code 94 indicates that a failure has been detected by the ECA, but is specific to systems that use a Gen2 ECA. Troubleshooting for this procedure is specific to the Gen2 ECA and associated harnesses.

Note: The troubleshooting procedure for Fault Code 64 may direct users to use this troubleshooting procedure if the vehicle is equipped with a Gen2 ECA, even if Fault Code 94 was not set by the transmission. This is because some transmission software versions do not set Fault Code 94.

Detection

The TECU monitors the ECA for excessive motor current, excessive motor temperature, incorrect motor position, improper battery or ignition voltage to the ECA, or various internal ECA malfunctions.

Conditions to Set Fault Code Active

FMI 2 – Data Erratic: ECA detects a loss of battery and/or ground for 1 second or longer.

FMI 7 – Mechanical System Not Responding: ECA detects excessive motor current or ECA detects incorrect clutch position during a clutch position change for 1 second or longer.

FMI 12 – Bad Intelligent Device: ECA detects an internal failure for 1 second or longer.

Fallback

All FMIs

  • “F” flashes in gear display.
  • Service light flashes (if equipped).
  • If the fault occurs at power up, engine cranks and starts, but TECU will not engage a gear.
  • If the fault occurs while driving, ECA maintains current clutch position or moves to the last position commanded by the TECU. Transmission may continue to shift until vehicle is stopped.

Conditions to Set Fault Code Inactive

FMI 2: No loss of battery and ground is detected for 2 seconds.

FMI 7: Normal motor current is detected and ECA position is correct for 2 seconds.

FMI 12: No internal ECA failures are detected for 2 seconds.

Possible Causes

FMI 2, 12

  • ECA Power Harness
    • Bent, spread, corroded or loose terminals
    • Wiring shorted to ground, shorted to power or open
  • ECA
    • Internal failure

FMI 7

  • ECA Power Harness
    • Bent, spread corroded or loose terminals
    • Wiring shorted to ground, shorted to power or open
  • Mechanical Clutch System
    • Lack of lubrication of clutch release shaft/bushings
    • Lack of lubrication of clutch
    • Damage to clutch release yoke or cross shaft
    • Internal failure
  • ECA
    • Internal failure
  • TECU
    • Software issue
  • Vehicle Harness
    • Wiring shorted to ground or shorted to power

Component Identification

_Graphics/LineArt/TRTS0940_FC94_ID.png

1. 38-Way Transmission Harness Connector

2. Transmission Electronic Control Unit (TECU)

3. ECA Shield

4. Electronic Clutch Actuator (ECA)

5. 8-Way ECA Connector

6. 2-Way ECA Connector

_Graphics/LineArt/TRTS0940_FC27_ID1.png

Eaton ECA Clutch

1. Clutch Wear Tab

2. Release Bearing

3. Release Bearing Grease Zerk

Fault Code 64 Troubleshooting Gen2 ECA

A
Purpose:Check for Active or Inactive fault codes.

  1. Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.

  2. Key on with engine off.

  3. Connect ServiceRanger.

  4. Update transmission and ECA software to latest available level, if not completed during the Diagnostic Procedure.

    Notice
    To avoid damaging the TECU, use an Eaton-approved communications adapter and ensure all satellite systems are disabled before updating software.

  • If Fault Code 64 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 64 is Inactive and there are other Active fault codes, troubleshoot all Active fault codes per Fault Code Isolation Procedure Index.

  • If Fault Codes 15, 16 or 19 are Active, troubleshoot per Fault Code Isolation Procedure Index

  • If Fault Code 64, FMI 12 is set, Go to Step B

  • If Fault Code 64, FMI 7 is set, Go to Step L

B
Purpose:Perform a Load Test on each vehicle battery.

  1. Key off.

  2. Set parking brake and chock wheels.

  3. Load test each vehicle battery per OEM specifications. Record reading(s).

  • If any battery(s) does not pass the Load Test, refer to OEM guidelines for repair or replacement of battery(s). Go to Step V

  • If all batteries pass the Load Test, Go to Step C

BatteryVoltage DropLoad Test Status (Pass/Fail)
1
2
3
4
5
C
Purpose:Inspect power and ground supply to the ECA.

  1. Key off.

  2. Inspect the ECA Power Supply Harness between the batteries and the ECA for signs of rubbing or chafing to the wiring.

  3. Inspect the ECA 40-amp In-line Fusible Link or Fuse Holder Connections for damage and bent, spread, corroded or loose terminals.

    Note: Some chassis use a power and ground distribution block separate from the battery or may route power and ground to the starter. Be sure to clean and inspect connections at this location and at the battery.

    _Graphics/LineArt/TRTS0940_EPT_ECAGen2toBattery.png

  • If damage is found, refer to OEM guidelines for repair or replacement of the ECA Power Supply Harness. Go to Step V

  • If no damage is found, Go to Step D

D
Purpose:Verify condition of 2-Way ECA Connector.

  1. Key off.

  2. Disconnect 2-Way Gen2 ECA Connector.

  3. Verify connector is free from any corrosion; the terminals are not bent, spread or loose; and there is no damage to the connector body.

  4. Inspect ECA side of 2-Way Gen2 ECA Connector, verify connector is free from any corrosion, the terminals are not bent, spread or loose; and there is no damage to the connector body.

    _Graphics/LineArt/TRTS0940_EPT_PinA.png
E
Purpose:Verify battery voltage at ECA.

  1. Key off.

  2. Measure voltage between 2-Way Gen2 ECA Connector Pin 2 (Battery positive) and Pin 1 (Battery negative). Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_EPTGen2_2WayPin1andPin2.png

  3. Compare reading(s) in table.

  • If readings are out of range, refer to OEM guidelines for repair or replacement of the ECA Power Supply Harness. Go to Step V

  • If readings are in range, Go to Step F

PinsRangeReading(s)
1 to 2Within 1.2 V of Battery Positive (+)
F
Purpose:Verify polarity of battery voltage at ECA.

  1. Key off.

  2. Measure voltage between 2-Way Gen2 ECA Connector Pin 2 (Battery positive) and ground. Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_EPTGen2_2WayPin2andGround.png

  3. Compare reading(s) in table.

  • If readings are out of range, Pin 2 (Battery positive) and Pin 1 (Battery negative) wires are incorrectly pinned in the 2-Way Gen2 ECA Connector. Refer to OEM requirements for repair or replacement. Go to Step V

  • If readings are in range, Go to Step G

PinsRangeReading(s)
2 to GroundWithin 1.2 V of Battery Positive (+)
G
Purpose:Load Test the vehicle power and ground supply to the ECA.

  1. Key off.

  2. Load test the 2-Way Gen2 ECA Connector and ECA Power Supply Harness with an external load source. Use a sealed beam headlamp or blower motor attached to Pin 2 (Battery positive) and Pin 1 (Battery negative). Load Test for 5 minutes to verify the harness will carry a load with the 40-amp fuse or fusible link installed.

  3. Wiggle the ECA Power Supply Harness during the Load Test from the vehicle batteries to ECA.

    _Graphics/LineArt/TRTS0940_FC96_VPin1andPin2Load.png

  • If the ECA Power Supply Harness does not carry a load, refer to OEM guidelines for repair or replacement. Go to Step V

  • If the ECA Power Supply Harness carries a load, Go to Step H

H
Purpose:Check for Active or Inactive fault codes.

  1. Determine which FMI set for Fault Code 64 as noted in Step A.

I
Purpose:Actuate the ECA and Check for Active or Inactive fault codes.

  1. Key off.

    Note: Allow 2–3 minutes for the TECU to perform a complete power-down sequence before proceeding.

  2. Set parking brake and chock wheels.

  3. Reconnect all connectors and verify that all components are properly installed.

  4. Key on with engine running.

  5. Connect ServiceRanger.

  6. Depress and hold service brake.

  7. Select Drive Mode with the Driver Interface Device and wait 10 seconds.

  8. After waiting 10 seconds, select Neutral Mode with the Driver Interface Device.

  9. Ensure the parking brake is applied.

  10. Key on with engine off.

  11. Release service brake.

  12. Go To “Fault Codes”.

  13. Retrieve and record the transmission fault codes and FMIs, and their occurrences and timestamps.

  • If ECA and TECU software were updated to the latest available levels during the Diagnostic Procedure or Step A and Fault Code 64 FMI 2 or 12 is Inactive, test complete. Go to Step V

  • If ECA and TECU software were at the latest available levels and Fault Code 64 FMI 2 or 12 is Inactive, no problem was found. The intermittent nature of the fault makes it likely that the problem is in the ECA Power Supply Harness and/or battery/charging system. Refer to OEM guidelines for troubleshooting intermittent wiring and/or battery/charging system issues. Go to Step V

  • If ECA and TECU software are at the latest available levels and Fault Code 64 FMI 2 or 12 is Active and no fault was found with the ECA Power Supply Harness or battery/charging system, replace the Electronic Clutch Actuator (ECA). Go to Step V

J
Purpose:Inspect for proper lubrication of Clutch Release Bearing and Cross Shaft.

  1. Key off.

    Note: Allow 2–3 minutes for the TECU to perform a complete power-down sequence before proceeding.

  2. Set parking brake and chock wheels.

  3. Remove single bolt for clutch housing access cover.

  4. Inspect for excessive clutch dust, broken clutch or spring material or other signs of clutch failure.

  5. Ensure Release Bearing and Cross Shaft are adequately greased per the Heavy-Duty Clutch Service Manual (CLSM0200).

  • If physical signs of a failure are found, replace Heavy-Duty ECA Clutch and Cross Shaft. Go to Step V

  • If no issues found and properly greased, Go to Step K

K
Purpose:Verify Clutch Release Yoke and Cross Shaft rotation.

  1. Key off.

  2. Remove ECA.

  3. Inspect Clutch Release Yoke for excessive wear.

  4. Rotate Clutch Release Yoke and Cross Shaft. Verify that they rotate freely without binding.

  • If the Clutch Release Yoke shows excessive wear, replace Clutch Release Yoke. Go to Step V

  • If Clutch Release Yoke and Cross Shaft bind when rotated, replace Cross Shaft. Go to Step V

  • If no issues are found with the Clutch Release Yoke and the Cross Shaft rotates freely without binding, and no fault was found with the ECA Power Supply Harness or battery/charging system, replace the Electronic Clutch Actuator (ECA). Go to Step V

L
Purpose:Determine Vehicle Manufacturer.

  1. Determine if vehicle manufacturer is PACCAR.

M
Purpose:Verify TECU Software Version - All other OEMs.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To Programming.

  4. Under "Software Information", record TECU software version.

  • If TECU software is less than 5570065, update TECU software to 5570065 or greater. Go to Step V

  • If TECU software is 5570065 or greater, Go to Step B

N
Purpose:Verify TECU Software Version - PACCAR OEM.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To Programming.

  4. Under "Software Information", record TECU software version.

  • If TECU software is less than 5570065, update TECU software to 5570065 or greater. Go to Step O

  • If TECU software is 5570065 or greater, Go to Step O

O
Purpose:Review TAIB-0883.

  1. Refer to TAIB-0883.

  • If TAIB-0883 has not been completed, perform TAIB-0883.

  • If TECU software was updated during previous step and vehicle does not meet criteria of TAIB-0883 or if TAIB-0883 was already completed, Go to Step V

  • If TECU software was not updated during previous step and vehicle does not meet criteria of TAIB-0883 or if TAIB-0883 was already completed, Go to Step B

V
Purpose:Verify repair.

  1. Key off.

  2. Reconnect all connectors and verify that all components are properly installed.

  3. Key on with engine off.

  4. Clear fault codes using ServiceRanger.

  5. Drive vehicle and attempt to reset the code or duplicate the previous complaint.

  6. Check for fault codes using ServiceRanger.