CASE (RIGHT HAND) 4S6257 - Caterpillar

Use this procedure to troubleshoot a suspected problem with a circuit that is for the driven equipment and the emergency stop switches.The state of the emergency stop input allows the Electronic Control Module (ECM) to determine if the operator is ready for engine starting. The state of the driven equipment input allows the ECM to determine if the driven equipment is ready for engine starting. The emergency stop switch can be used by the operator to prohibit engine starting and the switch can be used to shut down the engine. A switch can also be installed by the customer that will check the state of the driven equipment prior to engine starting. The switch can also shut down the engine in the case of adverse operation of the driven equipment.The emergency stop switch is located on the engine control panel. The ECM is configured to record a diagnostic code when the switch is activated. The emergency stop switch is a normally closed switch in the RUN position.Terminal P1-49 at the engine ECM is reserved as a driven equipment input. The circuit may be wired by the customer to a normally closed switch that will become grounded to the -Battery during engine operation. In order for engine starting to be initiated, this terminal must become grounded. Once the circuit is grounded, a delay timer begins to count down a preprogrammed delay. If the circuit becomes open during engine operation, the engine will be shut down. Refer to Systems Operation, "System Configuration Parameters" for information that is related to the "Driven Equipment Delay Time" parameter.Note: The driven equipment input at the engine ECM must be grounded in order for the engine to be cranked. At the factory, the circuit is connected to terminal 16 (-Battery) at the terminal strip that is in the display panel. If a driven equipment check is not being used on this engine, ensure that this wiring is in place.
Illustration 1 g02031314
Schematic for the engine shutdown circuits
Illustration 2 g03431296
Location of the components for the engine shutdown circuits (1) J1/P1 ECM connectors (2) Emergency shutdown switch (3) Interconnect harness connector
Illustration 3 g02031579
Terminal locations at the P1 ECM connector that are for the engine shutdown switches (35) Return (49) Driven equipment (52) Emergency stop
Illustration 4 g02036555
Terminal locations at the interconnect harness connector that are for the engine shutdown switches (A) Emergency stop (r) Return (U) Driven equipment (x) -Battery
Illustration 5 g02035555
Terminal locations at the terminal strip that is inside the box for the display panel (11) Return (12) Driven equipment (14) Emergency stop (16) -Battery
Illustration 6 g02035480
Terminal locations at the connector for the emergency stop switch that are inside the box for the display panel (Terminal 1) Emergency stop (Terminal 2) Return
Table 1
Troubleshooting Test Steps    Values    Results    
1. Inspect the Electrical Connectors and the Wiring
A. Turn the battery disconnect switch to the OFF position.
B. Thoroughly inspect connectors (1) and 3. Also, thoroughly inspect the terminal connections at the terminal strip and at the emergency stop switch (2) that are inside the