UltraShift PLUS
TRTS0940 EN-US
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July 2024 - A

Fault Code 67: Gen1 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 67 indicates an issue with the ignition supply voltage to the ECA.

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 during key on operation.

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

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_FC67_ID1.png

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. Gen1 ECA Shield

4. Gen1 Electronic Clutch Actuator (ECA)

5. 8-Way Gen1 ECA Connector

_Graphics/LineArt/TRTS0940_FC67_Wiring.png

1. Transmission Electronic Control Unit (TECU)

2. 38-Way Transmission Harness Connector

3. 8-Way Gen1 ECA Connector

_Graphics/LineArt/Wiring-Key-EPS.png

Fault Code 67 Troubleshooting Gen1 ECA

A
Purpose:Identify ECA installed on transmission.

  1. Inspect ECA OEM Power Supply Connector, reference image below.

    _Graphics/LineArt/TRTS0940_ECAFaultCodes_ECAIdentification.png
B
Purpose:Determine Vehicle Manufacturer.

  1. Determine if vehicle manufacturer is PACCAR.

C
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.

D
Purpose:Verify condition of 8-Way Gen1 ECA Connector.

  1. Set parking brake and chock wheels.

  2. Key off.

  3. Disconnect the 8-Way Gen1 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 Gen1 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.

E
Purpose:Verify ignition voltage signal at the ECA from the TECU.

  1. Key on.

  2. Measure voltage between 8-Way Gen1 ECA Connector Pin H and ground. Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_FC67_PinHandGround.png

  3. Compare reading(s) in table.

    Note: If ECA is replaced, perform clutch adjustment through ServiceRanger prior to vehicle operation.

PinsRangeReading(s)
H to GroundWithin 1.2 V of Battery Voltage
F
Purpose:Check for Active or Inactive fault codes.

  1. Key off.

  2. Reconnect the 8-Way Gen1 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.

G
Purpose:Verify ignition voltage signal circuit continuity between ECA and TECU.

  1. Key off.

  2. Disconnect 38-Way Transmission Harness Connector.

  3. 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.

  4. Measure resistance between 38-Way Transmission Harness Connector Pin 13 and 8-Way Gen1 ECA Connector Pin H. Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_FC67_Pin13andH.png

  5. Compare reading(s) in table.

PinsRangeReading(s)
13 to H0.0–0.5 ohms
H
Purpose:Verify ECA ignition voltage circuit is not shorted to ground.

  1. Key off.

  2. Measure resistance between 38-Way Transmission Harness Connector Pin 13 and ground. Record reading(s) in table.

    _Graphics/LineArt/TRTS0940_FC67_Pin13andGround.png

  3. Compare reading(s) in table.

PinsRangeReading(s)
13 to GroundOpen Circuit (OL)
I
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.

J
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 C

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.