P1797-MANUAL SHIFT OVERHEAT

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The major cause of heat build up in the transmission is torque converter slip. With the transmission in the AutoStick® mode, the torque converter can slip during aggressive driving or heavy loading conditions such as trailer towing or driving up steep grades. In the non AutoStick® mode, internal controller logic prevents the transmission from overheating by managing the shift and EMCC schedule. In the AutoStick® mode, when the transmission or engine temperature approaches an overheat condition, the manual shift overheat DTC sets and the AutoStick® mode is temporarily suspended until the temperature returns to normal.


  • When Monitored:

    Continuously with engine running.

  • Set Condition:

    If the Engine Temperature exceeds 123° C (255° F) or the Transmission Temperature exceeds 135° C (275° F) while in AutoStick® mode. Note: Aggressive driving or driving in Low for extended periods of time will set this DTC.


Possible Causes
 
MANUAL SHIFT OVERHEAT
 


Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)



Diagnostic Test

1.MANUAL SHIFT OVERHEAT







NOTE: Aggressive driving or driving in Low for extended periods of time will set this DTC.



If there are no possible causes remaining, view repair.

Repair