Fault Code 175: Engine Requested Torque
J1939: SA 3 SPN 518 FMI 11, 12, 14
Overview
The Transmission Control Module (TCM) sends and receives Engine Requested Torque messages to and from the engine Electronic Control Unit (ECU) over the Primary Data Link (J1939A). This message is used by the TCM to confirm the Engine ECU is receiving and responding to the requested torque.
Detection
The TCM monitors Engine Requested Torque messages. If messages are not received or are 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:
- Coast Mode and Neutral Coast prohibited
- Urge to Move and Creep Mode prohibited
- Upshifts prohibited
- Torque above idle prohibited
FMI 12:
- Torque above idle prohibited
FMI 14:
- Engine retarder torque prohibited
Conditions to Set Fault Code Inactive
FMI 11, 12, 14: Key cycle and fault condition no longer exists
Possible Causes
FMI 11, 12, 14:
- TCM
- Software issue
- Internal failure
Additional Tools
- None
Fault Code 175 Troubleshooting
Set vehicle parking brake and chock wheels.
Record transmission fault codes, FMIs, occurrences, and timestamps from 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 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 vehicle operates properly, test complete.
If Fault Code 175 sets Active, Go to Step A
If a fault code other than 175 sets Active, troubleshoot per Fault Code Isolation Procedure Index.