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Shift Time Adaptation (Shift Overlap Adaptation, Working Pressure) Shift time adaptation is the ability of the TCM to electronically alter the time it takes to go from one gear to another. 1. Accelerating upshift, which is an upshift under a load. For shift time adaptation for the 1-2 upshift to take 2. Decelerating upshift, which is an upshift under no load. This shift is a rolling upshift and is accomplished by 3. Accelerating downshift, which is a downshift under load. This shift can be initiated by the throttle, with or with- 4. Decelerating downshift, which is accomplished by coasting down. As the speed of the vehicle decreases, the Fill Pressure Adaptation (Apply Pressure Adaptation, Modulating Pressure) Fill pressure adaptation is the ability of the TCM to modify the pressure used to engage a shift member. The value • If too much pressure is used, the shift will be hard. • If too little pressure is used, the transmission may slip. The pressure adjustment is needed to compensate for the tolerances of the shift pressure solenoid valve. The Fill Time Adaptation (Engagement Time Adaptation) Fill time is the time it takes to fill the piston cavity and take up any clearances for a friction element (clutch or CONTROLLER MODES OF OPERATION Permanent Limp-In Mode When the TCM determines there is a non-recoverable condition present that does not allow proper transmission 9 P 9 position. When the shifter has been placed in 9 P, 9 the transmission only allows 2nd gear operation. If this occurs while the vehicle is not moving, the transmission only allows operation in 2nd gear. Temporary Limp-In Mode This mode is the same as the permanent Limp-In Mode except if the condition is no longer present, the system Under Voltage Limp-In Mode When the TCM detects that system voltage has dropped below 8.5 volts, it disables voltage-dependant diagnostics Hardware Error Mode When the TCM detects a major internal error, the transmission is placed in the permanent Limp-In Mode and 8E - 286 ELECTRONIC CONTROL MODULES - SERVICE INFORMATION WK |