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 Clutch Temperature. If the Clutch Temperature exceeds the normal operating range the TCM will modify transmission operation to prevent clutch damage and notify the driver that a clutch abuse event is occurring.
Detection
The TCM monitors clutch operation. If the calculated Clutch Temperature value exceeds the normal operating range, the fault is set Active.
Conditions to Set Fault Code Active
FMI 0 – Data Valid But Above Normal (Most Severe): Clutch Temperature value above normal, most severe, clutch protection is required.
FMI 15 – Data Valid but Above Normal (Least Severe): Clutch Temperature value above normal, least severe, clutch abuse is warning is displayed.
FMI 16 - Data Valid but Above Normal (Moderately Severe): Clutch Temperature reports above normal, moderately severe, clutch abuse warning is displayed.
Fallback
FMI 0:
- Amber warning lamp on (OEM specific)
- Red stop lamp on (OEM specific)
- Audible warning tone (OEM specific)
- Clutch Temperature Message (OEM specific)
- Urge to Move and Creep Mode prohibited
- Non-Neutral modes prohibited
- PTO Mode prohibited
- High Start Gears prohibited
FMI 15:
- High Start Gears prohibited
FMI 16:
- Amber warning lamp on (OEM specific)
- Audible warning tone (OEM specific)
- Clutch Temperature Message (OEM specific)
- High Start Gears prohibited
Conditions to Set Fault Code Inactive
The operation that is overheating the clutch is discontinued and Clutch Temperature value is within normal operating range.
Possible Causes
FMI 0, 15, 16
- Using accelerator pedal to hold vehicle on a grade
- Vehicle overloading
- Abusive or extreme operating conditions
Additional Tools
- Endurant XD Driver Instructions TRDR0960
Fault Code 815 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 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 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 815 sets Active, Go to Step A
If a fault code other than 815 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.