Diagnostic Test
CHECK FOR INTERNAL TRANSMISSION PROBLEM
NOTE:
Transmission gear ratio errors can be caused by intermittent speed sensor(s) errors. If there are any speed sensor DTCs set, perform the speed sensor diagnostic test before diagnosing any gear ratio error DTC. Review the event data and the When Monitored and Set Conditions for the DTC and attempt to duplicate the condition the DTC set.
- Determine if there are any Transmission mechanical problems present.
- Remove the Transmission Oil Pan and inspect for excessive debris or a plugged Transmission Oil Filter.
- Inspect valve body for foreign material.
Is there any Transmission mechanical problems present?
Yes
- Repair as necessary in accordance with the Service Information.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 6F24 TRANSMISSION VERIFICATION TEST .
No
- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information. Refer to MODULE, TRANSMISSION CONTROL, REMOVAL .
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 6F24 TRANSMISSION VERIFICATION TEST .