VALVE GP-MAIN CONTROL 2T1725 - Caterpillar

Reference: For information on the function of the autoshift control, refer to Systems Operation, "Power Train Electronic Control System".Reference: For information on the function of the Power Train ECM, refer to Systems Operation, "Electronic Control Module (Power Train)".Limit Switch (STIC Lockout Control)
Illustration 7 g06002664
Limit switch (STIC lockout control)
Note: The limit switch is part of the STIC lockout control.The limit switch (STIC lockout control) is used to lock the transmission in the neutral position. The limit switch (STIC lockout control) is activated by the steering and transmission lock lever. The steering and transmission lock lever is on the operator station door. The transmission will be in neutral if the steering and transmission lock lever is in the LOCKED position.After the steering and transmission lock lever is placed in the UNLOCKED position, the transmission is in neutral. The transmission remains in neutral until the transmission direction control switch is moved to the NEUTRAL position, then to the FORWARD, or the REVERSE position.The valid combinations for each switch position are shown in Table8 that follows.
Table 8
Limit Switch (STIC Lockout Control)
Switch Position N/C
J1-33 N/O
J1-34
Locked Closed Open
Unlocked Open Closed Note: The normally closed (N/C) circuit and normally open (N/O) circuit of the switch are used for diagnostic purposes. A circuit failure is present if two circuits are open at same time or if the two circuits are grounded at the same time. This fault is then shown on the display of the Caterpillar Monitoring System.Reference: For information on the Power Train ECM, refer to Systems Operation, "Electronic Control Module (Power Train)"Start Switch (Key)
Illustration 8 g06002666
Key start switch
The key start switch is an input of the Power Train Electronic Control Module (ECM). The switch connects to connector contact J2-1. The switch sends a signal to the Power Train ECM that the operator wants to start the engine. The Power Train ECM then initiates the neutral start function. The signal is open during normal operation. The switch closes to the +battery when the switch is in the START position.The switch has a connector with four contacts. Contact 1 connects to the main power relay. Contact 2 is not used. Contact 3 connects to the key start switch contact J2-1 on the Power Train ECM. Contact 4 connects to battery voltage.Note: After the switch is initially turned to the START position, the switch will not return to the START position from the ON position. The switch must be turned to the OFF position. The switch can then be turned to the START position.The Power Train ECM does not record diagnostic codes that are related with the key start switch.Reference: For information on the neutral start function, refer to Systems Operation, "Power Train Electronic Control System".Reference: For information on the Power Train ECM, refer to Systems Operation, "Electronic Control Module (Power Train)".Toggle Switch (Ride Control)
Illustration 9 g06002667
Ride control switch
The ride control switch is an input of the Power Train Electronic Control Module (ECM). The ride control switch informs the Power Train ECM of the ride control mode that is selected.