|
|
Automatic Transmission – 4L60E – Electrical Diagnosis Page 7C2–90 Refer to 2 Wiring Diagrams and Connector Chart to aid in diagnosis. Conditions for Running the DTC • The engine run time is greater than 5 seconds. • The 1-2 SS is commanded on. Conditions for Setting the DTC DTC P0973 sets when either of the following conditions occurs for 4.3 seconds: • The TCM detects an open in the 1-2 shift solenoid valve circuit when the 1-2 SS is commanded on. • The TCM detects a short to ground in the 1-2 shift solenoid valve circuit when the 1-2 SS is commanded on. 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 TCC commands maximum line pressure. • The TCM inhibits 3-2 shift if vehicle speed is less than 40 km/h. • 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 P0973 in TCM history. 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 an emission related • The TCM cancels the 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: 4 Checks the ability of the TCM to control the solenoid. 5 Checks for supply voltage to the 1-2 SS valve. 6 Checks the ability of the TCM and wiring to control the ground circuit. 8 Checks the resistance of the control valve body wiring harness and the 1-2 SS valve. 9 Checks if the 1-2 SS or control valve body wiring harness is shorted to the transmission housing. 13 Checks if the control valve body wiring harness is shorted to ground. 14 Checks if any of the other solenoids in the transmission are shorted to ground. |