UltraShift PLUS
TRTS0940 EN-US
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July 2024 - A

Fault Code 67: Gen2 ECA Ignition Voltage

J1587: MID 130 PID 158 FMI 3, 4

J1939: SA 3 SPN 520274 FMI 3, 4

Overview

The UltraShift PLUS transmission is equipped with an Electronic Clutch Actuator (ECA) that controls the position of the clutch assembly. The ECA requires a 12-volt ignition supply from the Transmission Electronic Control Unit (TECU) via the Transmission Harness to initiate ECA operation when the key is on. Fault Code 97 indicates an issue with the ignition supply voltage to 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 67 may direct users to use this troubleshooting procedure if the vehicle is equipped with a Gen2 ECA, even if Fault Code 97 was not set by the transmission. This is because some transmission software versions do not set Fault Code 97.

Detection

After power up, the ECA monitors the ignition voltage from the TECU. If the ECA loses ignition voltage, but maintains battery voltage and High Integrity Link (HIL) communication, that information is broadcast to the TECU and the fault code sets Active.

Conditions to Set Fault Code Active

FMI 3 – Voltage Above Normal or Shorted High: ECA ignition voltage is shorted high for 2 seconds.

FMI 4 – Voltage Below Normal or Shorted Low: ECA ignition voltage is shorted to ground or open for 2 seconds.

Fallback

All FMIs

  • “F” flashes in gear display.
  • Service light flashes (if equipped).
  • Engine does crank but the transmission cannot engage a start gear from neutral.
  • If failure occurs during operation transmission shift quality is not affected by the fault until the vehicle ignition switch is turned off and TECU powers down.

Conditions to Set Fault Code Inactive

All FMIs: Ignition voltage signal is within range for 6 seconds.

Possible Causes

All FMIs:

  • Transmission Harness
    • Damage to wiring between the TECU and ECA
    • Bent, spread, corroded or loose terminals
    • Wiring shorted to ground or open
  • ECA
    • Internal Failure
  • TECU
    • Internal Failure
  • Vehicle Harness
    • Wiring shorted to ground or shorted to power

Component Identification

_Graphics/LineArt/TRTS0940_FC95_ID2.png

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. ECA Shield

4. Electronic Clutch Actuator (ECA)

5. 8-Way ECA Connector

_Graphics/LineArt/TRTS0940_FC97_Wiring.png

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. 8-Way Gen2 ECA Connector

_Graphics/LineArt/Wiring-Key-EPS.png

Fault Code 67 Troubleshooting Gen2 ECA

A
Purpose:Determine Vehicle Manufacturer.

  1. Determine if vehicle manufacturer is PACCAR.

B
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.

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

C
Purpose:Verify condition of 8-Way Gen2 ECA Connector.

  1. Set parking brake and chock wheels.

  2. Key off.

  3. Disconnect the 8-Way Gen2 ECA Connector.

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

  5. Inspect the ECA side of the 8-Way Gen2 ECA Connector, verify the connector is free from contamination and corrosion; the terminals are not bent, spread or loose; and there is no damage to the connector body.

D
Purpose:Verify ignition voltage at the ECA from the TECU.

  1. Key on.

  2. Measure voltage between 8-Way Transmission Harness Connector Pin 7 and ground. Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_FC86_Gen2ECA-Pin7andGround.png

  3. Compare reading(s) in table.

PinsRangeReading(s)
7 to groundWithin 1.2 V of Battery Voltage
E
Purpose:Check for Active or Inactive fault codes.

  1. Key off.

  2. Reconnect the 8-Way Gen2 ECA Connector and verify that all components are properly installed.

  3. Key on.

  4. Connect ServiceRanger.

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

F
Purpose:Verify resistance of ignition voltage circuit and not shorted to ground between ECA and TECU.

  1. Key off.

  2. Disconnect 38-Way Transmission Harness Connector.

  3. Inspect 38-Way Connector body for damage and bent, spread, corroded or loose terminals.

  4. Measure resistance between 38-Way Transmission Harness Connector Pin 13 and 8-Way Gen2 ECA Connector Pin 7. Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_FC97_Gen2ECA-Pin13and7.png

  5. Measure resistance between 38-Way Transmission Harness Connector Pin 13 and ground.

    _Graphics/LineArt/TRTS0940_FC67_Pin13andGround.png

  6. Compare reading(s) in table.

PinsRangeReading(s)
13 to 70.0–0.5 ohms
13 to GroundOpen Circuit (OL)
G
Purpose:Check for Active or Inactive fault codes.

  1. Key off.

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

  3. Key on.

  4. Connect ServiceRanger.

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

H
Purpose:Review TAIB-0883

  1. Refer to TAIB-0883.

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

  • If 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.