SENSOR AS 1457982 - Caterpillar

During the procedure for transmission clutch fill calibration, the calibration software may need to adjust one of the parameters beyond the limit of the design specification. In this case, error codes E21, E22, E23, E24, E25, or E26 will appear in the display area after the calibration procedure is complete. The software will select the best values, but the error code indicates that an error exists in either the conditions for calibration or the transmission system. If error codes E21 through E26 are displayed, check the following conditions for the source of the error:
Make sure that the transmission oil and the transmission components are fully warmed in order to run the calibration.
Make sure that the clutch solenoid modulating valves are correctly torqued. (Make sure that the valves are cool when the valves are torqued.)
Worn seals are causing leakage.
The clutch is worn beyond the allowable range.
The clutch solenoid modulating valve is damaged.
A clutch solenoid modulating valve was replaced, but not energized sufficiently prior to performing the calibration procedure for the transmission clutch fill .Procedure for Transmission Clutch Fill Calibration
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.Prevent possible injury by performing the procedure that follows before working on the machine.
Do not connect or disconnect hose fittings to or from the quick disconnect nipples when there is pressure in the system. This will prevent damage to the seals that are in the fitting.
Park the machine on a smooth, level surface.
Shift the transmission direction control switch to the NEUTRAL position.
Lower the blade or the work tool to the ground.
Engage the parking brake.
Place blocks in front of the wheels and behind the wheels.
Install the steering frame lock.
Allow only authorized personnel on the machine. Keep unauthorized personnel off the machine and in clear sight of the operator.Note: The steps of this procedure must be performed exactly, as described below. This procedure may terminate if any unknown functions or any unexpected functions are activated. This procedure may terminate if a fault (CID FMI) is present. Do not move any switch positions, any levers or any pedals unless you are instructed differently.
Table 2
Required Tools    
Part Number     Description     Quantity    
4C-8195     Control Service Tool     1    Note: If a new clutch solenoid modulating valve was installed, shift the transmission for at least 12 times into a speed or a direction that uses the clutch solenoid modulating valve. Allow sufficient time for the corresponding clutch to be fully pressurized.
The calibration for transmission clutch engagement (submode 31 through submode 36) should be performed prior to the transmission clutch fill calibration (submode 40).Reference: For more information on the calibration for transmission clutch engagement (submode 31 through submode 36), refer to Testing and Adjusting, "Engagement Pressure for the Transmission Clutch (Caterpillar Monitoring System) - Calibrate".
Shift the transmission direction control switch to the NEUTRAL position.
Engage the parking brake.
Illustration 1 g00499345
(1) Set/Decel Switch. (2) Resume/Accel Switch.
Increase the engine speed to