Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
TRANSMISSION SHIFTS EARLY WITH NO DTC'S DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Using the DRBIII®, check all other Modules for signs of a PCI bus problem such as bus related DTC's and/or communication problems. Check and diagnose all 1 trip failures as a hard code. Although it takes two occurrences of a missed TRD link message to set the DTC P1793, one missed message will cause the transmission to short shift until the next start up. If the vehicle has any indications of a bus problem, the bus must be repaired first Do any of the other modules show signs of a bus problem? Yes --> Refer to the COMMUNICATION CATEGORY and perform the appropriate diagnostics. Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 . No --> Go To 2 |
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| 2 | The conditions necessary to set the DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorts and open circuits. Although it takes two occurrences of a missed TRD link message to set the DTC P1793, one missed message will cause the transmission to short shift until the next start up. If the vehicle has any indications of a bus problem, the bus must be repaired first Were there any problems found? Yes --> Repair as necessary. Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 | If the transmission shifts too early when the transmission is cold, this is a normal condition. The software is designed to protect the transmission from high torque and/or high RPM shifts during cold operation. Did the problem occur when the transmission temperature was cold? Yes --> This is a normal condition. The software is designed to protect the transmission from high torque and/or high RPM shifts during cold operation. Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 . No --> Test Complete. |
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