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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–122 Action Taken When the DTC Sets • The TCM requests the ECM to illuminate the MIL during the second consecutive trip in which the conditions for • The TCM commands maximum line pressure. • The TCM freezes transmission adaptive functions. • The TCM inhibits TCC engagement. • 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 either DTC U0073 or DTC U0100 in TCM history during the second consecutive trip in which the Conditions for Clearing the DTC • The ECM turns off the MIL after the fourth 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 a non-emission • The TCM cancels the DTC default actions when the ignition is off long enough to power down the TCM. Test Description The following number refers to the step numbers in the diagnostic table: 1 The following tests are included in the Diagnostic System Check. • Tests the integrity of the GM LAN serial data communication circuit. • Tests for fault conditions on the vehicle immobiliser system stored in the ICU. DTC P0864 and U0101 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 |