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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–66 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 3-2 downshifts if the vehicle speed is greater than 40 km/h. • 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 P0752 in TCM history during the second consecutive trip in which the conditions for setting 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. Diagnostic Aids • If you clear DTC P0752, and then cannot reset DTC P0752, the following conditions may exist: • Fluid contamination, • Blocked fluid circuits, or • Restricted fluid circuits. • Refer to 5.6 Shift Solenoid Valve State and Gear Ratio. Test Description The following numbers refer to the step numbers in the diagnostic table: 2 This step tests the TCM commanded all shifts, all shift solenoid valves responded correctly, and if all the shifts did 3 Checks the mechanical components that cause the DTC and their state. DTC P0752 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 |