UltraShift PLUS
TRTS0940 EN-US
|
July 2024 - A

Fault Code 12: Improper TECU Configuration

J1587: MID 130 SID 254 FMI 13

J1939: SA 3 SPN 629 FMI 13

Overview

The UltraShift PLUS transmission is equipped with a Transmission Electronic Control Unit (TECU). The TECU performs a variety of functions including receiving inputs from sensors, sending outputs to control devices, operating X-Y Shifter motors and actuators and making shift decisions. Fault Code 12 indicates an internal failure of the TECU.

Detection

The TECU performs a self-check during power up. If the TECU does not detect valid memory, or if there are missing or corrupt transmission configuration files, this fault sets Active.

Conditions to Set Fault Code Active

FMI 13 – Out of Calibration: TECU is unable to determine the proper transmission configuration.

Fallback

FMI 13

  • “F” flashes in gear display.
  • Service light flashes (if equipped).
  • Engine may not crank.
  • Transmission may not engage a gear.
  • Transmission may not make up shifts or down shifts.
  • Engine may have to be shut down with transmission still in gear.

Conditions to Set Fault Code Inactive

FMI 13: TECU has detected a proper configuration for the transmission.

Possible Causes

FMI 13

  • TECU
    • Internal failure

Component Identification

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1. Transmission Electronic Control Unit (TECU)

Fault Code 12 Troubleshooting

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.

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.

  • If no fault codes set Active and vehicle operates properly, test complete.

  • If Fault Code 12 sets Active during the test drive, refer to Contact Information and contact Eaton for further diagnostics.

  • If a fault code other than 12 sets Active, troubleshoot per Fault Code Isolation Procedure Index.