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Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–42 Action Taken When the DTC Sets • The TCM requests the ECM to illuminate the MIL. • The TCM allows the vehicle to operate in transmission protection mode. • The TCM records the operating conditions when the conditions for setting the DTC are met. The TCM stores this • The ECM records the operating conditions when the conditions for setting the DTC are met. The ECM stores this Conditions for Clearing the DTC • The ECM turns off the MIL after the third 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 DTC default actions when the ignition is off long enough to power down the TCM. Test Description The following numbers refer to the step numbers in the diagnostic table: 2 DTC P0602 indicates the TCM is not programmed. DTC P0601 to P0604 or P1621 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 2 1 Connect Tech 2 to the DLC. 2 Turn on the ignition, with the engine off. 3 On Tech 2 select: Has DTC P0602 set? Go to Step 3 Go to Step 4 3 1 On Tech 2 select: 2 Follow the instructions on Tech 2 and clear any DTCs. 3 Program the TCM, refer to 7C4 Automatic Transmission – 4 On Tech 2 select: Has DTC P0602 set? Go to Step 4 Go to Step 5 4 Replace the TCM, refer to 7C4 Automatic Transmission – 4L60E – Did you complete the replacement? Go to Step 5 — |