Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 2027
P1797-MANUAL SHIFT OVERHEAT
For a complete wiring diagram Refer to Section 8W.
•
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
T
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)
Theory of Operation
The major cause of heat build up in the transmission is torque converter slip. With the transmission in the Auto-
Stick
T
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 tem-
porarily suspended until the temperature returns to normal.
Diagnostic Test
1.
MANUAL SHIFT OVERHEAT
This is an informational DTC only.
With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.
Check the engine and transmission cooling system for proper operation.
Check the Radiator Cooling Fan operation.
Check the Transmission Cooling operation.
Check the Transmission Fluid Level per the Service Information to verify that it is not overfilled.
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
If the Transmission Fluid is low, repair any Transmission Fluid leak as necessary and adjust the Trans-
mission Fluid Level per the Service Information. Refer to Service Information for the related symptoms
and repair as necessary.
Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 42RLE - STANDARD PROCEDURE)
21 - 642
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
LX
U0002 CAN C BUS OFF PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
LX
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
21 - 643
•
When Monitored:
Every 7 msec with:
1) Engine speed greater than 500 RPM.
2) Battery voltage between 10 and 16 volts.
•
Set Condition:
CAN C bus messages are not received for 10 seconds.
Theory of Operation
The NGC controller communicates over the CAN C bus. The transmission controller continuously monitors bus
activity. The CAN C bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine
Controller is unable to communicate with the Transmission Controller, a DTC will set and the Engine Controller will
illuminate the MIL.
Diagnose the U0002 CAN C BUS OFF PERFORMANCE as the U0001 CAN C BUS CIRCUIT test in 8-ELEC-
TRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic procedures and for
further possible causes.
21 - 644
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
LX
U0100 LOST COMMUNICATION WITH ECM/PCM
For a complete wiring diagram Refer to Section 8W.
LX
AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS
21 - 645
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