DESCRIPTION
The 4T60-E transaxle uses 2 electric solenoids to control transaxle upshifts and downshifts. (Схема №1) Each solenoid is turned on or off by the Powertrain Control Module (PCM). PCM also includes on-board self-diagnostics. This helps identify which parts or circuits may need further testing.
OPERATION
Each solenoid either holds hydraulic pressure (solenoid on) or releases hydraulic pressure (solenoid off). This action controls shift valves inside valve body. By switching one or both solenoids on or off, different combinations of clutches, sprags and bands are operated. See CLUTCH & BAND APPLICATION CHART (4T60-E) under ELECTRONIC TESTING.
Limp-In Mode
If sensor input signals are missing or inadequate for transmission operation, PCM will output preset operating signals to transmission. This mode will keep vehicle operational and allow it to be driven with reduced transmission function and performance, to a repair facility. Malfunction Indicator Light (MIL) will light if malfunction occurs. Vehicle should not be driven for extended periods in limp-in mode.