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P1797-MANUAL SHIFT OVERHEAT For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - SCHE- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: 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 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Theory of Operation The major cause of heat build up in the transmission is torque converter slip. With the transmission in the Auto- 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 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- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. HB AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS 21 - 161 |