Fault Code 185: Driver Demanded Torque
J1939: SA 3 SPN 512 FMI 13, 19
Overview
The Transmission Control Module (TCM) receives the Driver Demanded Torque message over the Primary Data Link. The message is determined by a vehicle module based off of accelerator pedal position and other inputs. This information is used to determine transmission performance.
Detection
The TCM monitors the Driver Demanded Torque message. If the message is not available or in error, the fault is set active.
Conditions to Set Fault Code Active
FMI 13 – Out of Calibration: Driver Demanded Torque message not available for 5 seconds.
FMI 19 – Received Network Data in Error: Driver Demanded Torque message received but in error for 5 second.
Fallback
All FMIs
- Amber warning lamp on
- Lowest available start gear only
- Urge to Move and Creep mode prohibited
- Launch quality may degrade
- PTO mode prohibited
Note: If the vehicle is moving:
- Red stop lamp on
- Clutch engagement prohibited, vehicle may coast to a stop
- Transmission downshifts to lowest available start gear
Note: Vehicle fallback modes may vary.
Conditions to Set Fault Code Inactive
All FMIs: Driver Demanded Torque message available and valid for 10 seconds.
Possible Causes
All FMIs:
- Vehicle Components
- Module(s)
Note: Refer to OEM for troubleshooting a failed system.
Fault Code 185 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 185 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V
If Fault Code 185 FMI 13 is Active, refer to OEM and enable vehicle Driver Demanded Torque SPN 512. Go to Step V
If Fault Code 185 FMI 13 is Inactive, Go to Step V
If Fault Code 185 FMI 19 is Active or Inactive, there is a fault with the Driver Demanded Torque message sent from a vehicle module. Contact OEM for further diagnostic instructions. 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 185 sets Active during operation, Go to Step A
If a fault code other than 185 sets Active, go to Fault Code 185: Driver Demanded Torque.