Fault Code 175: Engine Requested Torque
J1939: SA 3 SPN 518 FMI 11, 12, 14
Overview
The Transmission Control Module (TCM) sends torque request messages to the Engine Electronic Control Unit (ECU) over the Primary Data Link. This message is used in normal operation of transmission.
Detection
The Transmission Control Module (TCM) monitors the torque request message. If the message is invalid, the fault is set active.
Conditions to Set Fault Code Active
FMI 11 – Root Cause Unknown: TCM did not command 0 engine torque when the engaged gear direction did not match the driver's selected mode direction.
FMI 12 – Bad Intelligent Device: TCM commanded inappropriately high engine torque.
FMI 14 – Special Instructions: TCM commanded inappropriately high engine retarder torque.
Fallback
FMI 11:
- Urge to Move and Creep Mode prohibited
- Torque above idle prohibited
- Upshifts prohibited
- Neutral Coast prohibited
- Accelerator pedal may be unresponsive
FMI 12:
- Torque above idle prohibited
- Accelerator pedal may be unresponsive
FMI 14:
- Retarder Torque Commands prohibited
Conditions to Set Fault Code Inactive
All FMIs: Key cycle
Possible Causes
All FMIs:
- TCM
- Software issue
- Internal failure
Additional Tools
- None
Fault Code 175 Troubleshooting
Set vehicle parking brake and chock wheels.
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.
If Fault Code 175 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 175 FMI 11, 12, 14 is Active or Inactive, Contact Eaton Cummins Automated Transmission Technologies for further diagnostic instructions. For Help Line phone numbers, go to Contact Information. Go to Step V
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Go to “Fault Codes”.
Select “Clear All Faults”.
Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set and the vehicle operates properly, test complete.
If Fault Code 175 sets Active during operation, Go to Step A
If a fault code other than 175 sets Active, troubleshoot per Fault Code Isolation Procedure Index.