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.
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| Illustration 1 | g02031314 |
Schematic for the engine shutdown circuits | |
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| 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 | |
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| 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 | |
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| 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 | |
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| 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 | |
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| 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 | |
| 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 display panel. Carefully inspect any other connections that are associated with the circuit for the driven equipment. Refer to Testing and Adjusting, "Electrical Connectors - Inspect" for details. C. Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the emergency stop switch. D. Check the torque of the fasteners at the ECM connectors. Refer to Testing and Adjusting, "Electrical Connectors - Inspect" for the correct torque values. E. Check the harness and the wiring for abrasion and for pinch points from the ECM to the emergency stop switch. |
Damaged connector or wiring |
Result: The connectors and wiring appear to be OK. Proceed to Test Step 2. Result: The connectors and/or wiring are not OK. Repair the wiring and/or the connectors. Replace parts, if necessary. |
| Troubleshooting Test Steps | Values | Results |
|---|---|---|
2. Check the Circuit for the Emergency Shutdown Switch at the ECM A. Ensure that the electrical power has been removed from the ECM. B. Disconnect the J1/P1 ECM connector. C. Place the emergency stop switch in the RUN position. D. Use a multimeter to check for continuity between terminals P1-35 and terminal P1-52. While the emergency stop switch is in the RUN position , the circuit must be continuous. E. Place the emergency stop switch in the STOP position. F. Use a multimeter to check for continuity between terminals P1-35 and terminal P1-52. While the emergency stop switch is in the STOP position , the circuit must not be continuous for the proper operation of the engine. |
Emergency shutdown switch |
Result: The circuit is continuous with the switch in the RUN and the circuit is not continuous with the switch in the STOP position. The switch and the switch circuit appear to be OK. Confirm that the problem is in the emergency stop circuit. If the emergency stop circuit is still suspected of the problem, check the harness and the connectors for an intermittent electrical problem. Start the engine and wiggle the engine harness, the interconnect harness, and the harness that is in the display panel. This test will help to locate the intermittent connection. For details that are related to intermittent connections, refer to Testing and Adjusting, "Electrical Connector - Inspect". Result: The circuit is not continuous with the switch in the RUN and/or the circuit is continuous with the switch in the STOP position. Check the emergency stop switch. Disconnect the wiring from the emergency stop switch. Check for continuity of the switch. With the switch in the RUN position, the circuit must be continuous. With the switch in the STOP position, the circuit must not be continuous. If necessary, replace the emergency stop switch. Perform the necessary repairs. |
| Troubleshooting Test Steps | Values | Results |
|---|---|---|
3. Check the Circuit for the Driven Equipment Check at the ECM A. Ensure that the electrical power has been removed from the ECM. B. Fabricate a jumper wire that is long enough to create a test circuit across the terminal strip that is in the display panel. C. Use the jumper wire to connect terminal 12 (driven equipment) to terminal 16 (-Battery) at the terminal strip. Remove any customer wiring that may be connected to terminal 12 of the terminal strip. D. Disconnect the J1/P1 ECM connector. E. Use a multimeter to check for continuity between terminals P1-49 (driven equipment) and terminal P1-1 (-Battery) at the ECM connector. The circuit will be continuous for a circuit that is in good repair. F. Restore the wiring to the original configuration. |
Continuity |
Result: The circuit is continuous while the jumper wire is installed. The circuit from the ECM to the terminal strip in the display panel is OK. The problem appears to be in the customer wiring or in the customer supplied components for the driven equipment check. Perform the necessary repairs. Result: The circuit is not continuous while the jumper wire is installed at the terminal strip. There is a problem in the circuit that is between the ECM and the terminal strip. The problem may be in the engine harness or the problem may be in the interconnect harness and/or a connector. Repair the harness and/or the connector. Replace parts, if necessary. |