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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–58 Conditions for Running the DTC • No DTCs P0722, P0723, P0742, P2763 or P2764. • The IMS range is D2, D3 or D4. • Ignition voltage is 8 – 18 V. • The transmission fluid temperature is greater than 20°C. • The engine torque is 108 – 881 Nm. • The throttle position is greater than 10 percent. • The gear ratio is within the following ranges: • 1.41:1 – 1.56:1 — 2nd gear, • 0.95:1 – 1.05:1 — 3rd gear. • The TCC is commanded on 0.1 seconds. • The TCC duty cycle is greater than 60 percent for more than 3 seconds. Conditions for Setting the DTC The TCM commands the TCC on, and the TCC slip is greater than 250 r.p.m. for 3 seconds. Action Taken When the DTC Sets • The TCM requests the ECM to illuminate the MIL during the second consecutive drive trip in which the conditions • The TCM inhibits TCC. • The TCM inhibits 4th gear if the transmission is in Hot Mode. • The TCM commands elevated line pressure. • The TCM freezes transmission adaptive functions. • 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 P0741 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 a non-emission • The TCM cancels the default actions when the ignition is off long enough to power down the TCM. Diagnostic Aids • Inspect the transmission fluid lines to the radiator. The lines may be pinched, blocked or twisted. • Contamination may cause the TCC apply valve to stick in the valve body. • Internal damage to the torque converter may prevent TCC application. Test Description The following numbers refer to the step numbers in the diagnostic table: |