LINING-BRAKE 9P0946 - Caterpillar

Transmission ECM controls the shift points. The basic components and corresponding requirements for shifting of the transmission are listed below:Transmission Shift Control - The ECM must know the desired gear position. The transmission shift control provides a ground signal. The ground signal varies with the gear that has been selected. The Transmission ECM also supports a "J1939" shifter.Transmission Output Speed Sensor (TOS) - The ECM must know the output speed of the transmission. One TOS sensor tells the ECM the speed of the transmission output shaft. The TOS sensor provides this information.Torque Converter Output Speed Sensor - The ECM must know the output speed of the torque converter. One speed sensor provides the information to the ECM regarding the speed of the torque converter. Shifter - The transmission functions as a manual shift. The transmission shifts to the gear that is selected by the shifter.Transmission Clutch Solenoids - The ECM must electrically shift the transmission. The ECM uses two separate outputs to the solenoids in order to shift the transmission. The transmission is always shifted one gear at a time. The ECM activates the solenoids electrically in order to shift the transmission.The items that follow are exceptions.
Do not attempt to shift from a forward gear to PARK if the speed of the transmission output shaft is moving faster than 1500 rpm. The ECM will not shift the transmission into PARK until the engine speed is less than 825 rpm and the speed of the transmission output shaft is less than 1500 rpm. This prevents damage to the clutches and discs which could lead to early transmission failure.
The transmission does not allow direct shifts between gears that are not adjacent. The transmission allows automatic sequential shifting. The transmission will sequentially upshift gear to gear from the current gear to the desired gear if the shift is allowed. The transmission will also allow sequential downshifts. The transmission will stay in each gear for a minimum time in order to prevent clutch slippage and damage to the transmission.Four events are logged in the ECM.
High torque converter oil temperature
Plugged transmission oil filter
Transmission abuse
Conflict of speed sensors