Fault Code 11: No TECU Operation
J1587: MID 130 SID 254 FMI 12
J1939: SA 3 SPN 629 FMI 12
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 11 indicates an internal failure of the TECU.
Detection
The TECU performs a self-check during power up, any failure detected sets this fault.
Conditions to Set Fault Code Active
FMI 12 – Bad Intelligent Device: TECU detects an internal failure.
Fallback
FMI 12
- “F” flashes in gear display.
- Service light flashes (if equipped).
- Engine may not crank.
- Transmission may not attempt to shift.
- Transmission may not confirm neutral.
- Engine may have to be shut down with transmission still in gear.
Conditions to Set Fault Code Inactive
FMI 12: Transmission powers up and the failure is no longer detected by the TECU.
Possible Causes
FMI 12
- TECU
- Internal failure
Component Identification
 |
1. Transmission Electronic Control Unit (TECU) |
Fault Code 11 Troubleshooting
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.
If Fault Code 11 sets Active or Inactive, replace Transmission Electronic Control Unit (TECU). Go to Step V
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Clear fault codes using ServiceRanger.
Drive vehicle and attempt to reset the code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set Active and vehicle operates properly, test complete.
If Fault Code 11 sets Active during the test drive, refer to Contact Information and contact Eaton for further diagnostics.
If a fault code other than 11 sets Active, troubleshoot per Fault Code Isolation Procedure Index.