Transmission Control Systems: Testing and Inspection

40/41TE PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE

1. Many transmission symptoms can be caused by a low fluid level. If the fluid level is low, locate and repair any leaks and fill the transmission to the proper fluid level.

Testing should only be performed with the battery fully charged to avoid false diagnosis.

With the scan tool, read Engine (PCM) DTCs. If Engine DTCs are present, refer to Computers and Control Systems/Testing and perform to the appropriate diagnostic procedure(s) before proceeding. Testing and Inspection

With the scan tool, read Transmission (TCM DTCs. Record all Stored, Active, and Pending DTC information. Diagnose any Pending DTC as a matured DTC.

With the scan tool, read DTC EVENT DATA. Use this data to identify the conditions in which the DTC was set.

Note: Performing a Battery Disconnect will clear all DTC EVENT DATA and reset all learned Transmission values to the controllers default values, which may temporarily result in erratic shift schedules.

With the scan tool, perform the Shift Lever Position Test. If the test does not pass, refer to the diagnostic procedure for P0706-Check Shifter Signal. P0706

For Gear Ratio Error DTCs, use the scan tool to read and record the Clutch Volume Index (CVI) information.

Use the wiring diagram as a guide, inspect the wiring and connectors related to this circuit and repair as necessary. Refer to the When Monitored and Set Conditions for this DTC. DTCs can set at ignition on, at start up, driving under specific conditions, and after controller diagnostic monitors have run.

Refer to applicable Technical Service Bulletins (TSBs) for controller software update information. Some conditions can be corrected by upgrading the Engine (PCM) or Transmission (TCM) controller software.

Check for any Service Information Tune-ups or Service Bulletins for any possible causes that may apply.

Were there any repairs made that fixed the vehicle?
Yes >> Testing complete.
Perform 40/41TE VERIFICATION TEST - VER 1 Transmission Verification Test
No >> Refer to Testing and perform the appropriate diagnostic procedure(s).