Fault Code 815: Clutch Temperature
J1939: SA 3 SPN 5939 FMI 0, 15, 16
Overview
The Transmission Control Module (TCM) monitors clutch performance to calculate the operating Clutch Temperature. If the Clutch Temperature is above normal, the TCM will adjust transmission operation to prevent clutch damage and notify the driver that a clutch abuse event is occurring.
Detection
The TCM monitors the Clutch Temperature. If the calculated temperature is above the normal operating range, the fault is set active.
Conditions to Set Fault Code Active
FMI 0 – Data Valid But Above Normal (Most Severe): The Clutch Temperature reports above normal, most severe, and clutch protection is required.
FMI 15 – Data Valid but Above Normal (Least Severe): The Clutch Temperature reports above normal, least severe, and clutch abuse is indicated.
FMI 16 - Data Valid but Above Normal (Moderately Severe): The Clutch Temperature reports above normal, moderately severe, and clutch abuse is indicated.
Fallback
FMI 0:
- Red stop lamp on
- Audible warning tone
- CA (Clutch Abuse) indicated in the display
- Non neutral modes prohibited
- PTO Mode prohibited
- High Start Gears prohibited
- Urge to Move and Creep Mode prohibited
- If the operation being performed causing clutch over-temp continues:
- Clutch opens
FMI 15:
- High Start Gears prohibited
FMI 16:
- Amber warning lamp on
- Audible warning tone
- CA (Clutch Abuse) indicated in the display
- High Start Gears prohibited
Conditions to Set Fault Code Inactive
All FMIs: The operation that is overheating the clutch is discontinued and the Clutch Temperature reports a normal operating range.
Possible Causes
All FMIs:
- Using the accelerator pedal to hold the vehicle on a grade
- Overloading the vehicle
- Abusive or extreme operating conditions
Additional Tools
Fault Code 815 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 815 FMI 0, 15, 16 is Active or Inactive, the clutch experienced abusive or extreme operating conditions. Refer to service bulletin TAIB0876. 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 815 sets Active during operation, Go to Step A
If a fault code other than 815 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.