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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–50 Action Taken When the DTC Sets • The TCM illuminates the MIL during the second consecutive trip in which the Conditions for Setting the DTC are • The TCM commands maximum line pressure. • The TCM freezes transmission adaptive functions. • The TCM calculates vehicle speed from the automatic transmission engine r.p.m. and commanded gear. • At the time of the first failure, the TCM records the operating conditions when the conditions for setting the DTC are • At the time of the second failure, the ECM records the operating conditions when the conditions for setting the DTC • The TCM stores DTC P0722 in TCM history. Conditions for Clearing the DTC • The ECM turns off the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination • Tech 2 can clear the DTC. • The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related • The TCM cancels the default actions when the ignition is off long enough to power down the TCM. Diagnostic Aids • Inspect the rear internal gear teeth for damage. • Visually inspect the VSS for cracks or damage. • Ensure the VSS is properly torqued to the extension housing. Test Description The following numbers refer to the step numbers in the diagnostic table: 2 Disable the traction control system when performing this step. When the ignition key is cycled off and then cycled 3 Checks the VSS for correct resistance. 4 Checks if the VSS and associated circuits are shorted to ground. 5 Checks the VSS produces an AC voltage when the output shaft is rotated. 6 Checks the integrity of the circuits between the TCM and the VSS. DTC P0722 Diagnostic Table Step Action Yes No 1 Has the Diagnostic System Check been performed? Go to Step 2 Refer to 4.7 Diagnostic System Check |