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Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
970-2 Engine Auxiliary Engine Shutdown Switch : Erratic, Intermittent, or Incorrect The two inputs from the emergency stop switch are in the opposite state. The code is logged. The Electronic Control Module (ECM) receives two signals from the emergency stop switch. The signals allow the ECM to determine the status of the emergency stop switch. The ECM will shut down the engine when both of the signals are open. When both of the signals are connected to the −Battery the emergency stop switch is not active, and the engine will run. If two different signals are detected during the powerup, the ECM will determine that one of the signals is incorrect. A diagnostic code will be logged and a diagnostic code will remain active. The engine will continue to run when the ECM detects two different signals. If both of the signals are open, the engine will stop.The customer can install multiple emergency stop switches. When the Engine Control Switch (ECS) is turned to the ON position, the engine will begin the sequence for start-up.When the emergency stop switch is activated, the ECM will stop firing the injectors. The engine will stop. When an emergency stop is received by the ECM, the ECM will activate the output for the solenoid valve that controls the air shutoff valve. When the solenoid valve activates, the air shutoff valve closes removing the intake air to the engine. Manually open the air shutoff valve in order to start the engine.Note: The air shutoff is optional. Set the programmable parameter with Caterpillar Electronic Technician (ET) in order to enable the air shutoff. The 970-31 Engine Auxiliary Engine Shutdown Switch event code will be set when the remote emergency stop switch is activated. This event will prevent engine operation. Electrical power to the ECM must be removed for three seconds in order to clear this event.
Illustration 1 g03035297
Emergency stop schematic
Table 2
Troubleshooting Test Steps Values Results
1. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Verify that the air shutoff mechanisms are set to the OPEN position.
C. Thoroughly inspect the ECM connectors. Also, inspect the connectors at the air shutoff mechanism that are for the solenoids. Also, inspect the switches for the air shutoff. Refer to Troubleshooting, "Electrical Connectors - Inspect"
D. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the air shutoff system.
E. Check the allen head screw on each ECM connector for the proper torque. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
F. Check the harness and the wiring for abrasion and for pinch points from the air shutoff solenoid to the ECM.
Connectors
Results: The connectors and wiring appear to be OK.
Proceed to Test Step 2
Results: The connectors and/or wiring are not OK.
Repair: Repair the wiring and/or the connectors. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are coupled.
Verify that the repair eliminated the problem.
2. Test the Operation of the Control Solenoid for the Air Shutoff Relay and Check for Logged Codes
A. Connect Cat ET to the service tool connector.
B. Restore the electrical power to the ECM.
C. Test the air shutoff system with the emergency stop switch:
a. Start the engine.
b. Place the emergency stop switch in the STOP position.
c. Check the position of the air shutoff mechanisms. Activation of the emergency stop will activate the air shutoff system and the air shutoff mechanisms will close.
Check that the solenoid has de-energized after the air shutoff mechanisms are closed.
d. Turn the main disconnect switch to the OFF position.
D. Check the status of the "Air Intake Shutoff Position" parameter in Cat ET.
a. While the air shutoff mechanism is shut, check the status of "Air Intake Shutoff Position" by using Cat ET.
Note: Wait at least 30 seconds in order for diagnostic codes to become active.
b. Reset the air shutoff mechanism. Check the status of the "Air Intake Shutoff Position" parameter in Cat ET while the left air shutoff is closed.
E. Use Cat ET to check for logged diagnostic codes. Check if the following codes are logged:
- 970-2
F. Reset the air shutoff mechanisms for the air shutoff to the open position.
- Place the emergency stop switch in the RUN position.
- Turn the main disconnect switch to the OFF position.
- Restore the wiring to the original configuration.
Codes
Results: The valve mechanisms are operating correctly. There are no diagnostic codes that are logged during the test.
Repair: The air shutoff system appears to be operating correctly. The original problem seems to be resolved. There may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent problems.
Results: The valve mechanism did not close when the emergency stop switch is activated. There is a logged 970-2 diagnostic code.
Proceed to Test Step 3
3. Check the Voltage at the Emergency Stop Switch (Customer)
A. Remove the wire from the output terminal at the connector for the emergency stop switch.
B. Restore the electrical power to the ECM.
C. Connect a voltmeter between the output terminal of the emergency shutdown switch and the −Battery.
D. As the emergency stop switch is activated, measure the voltage at the output of the switch.
- Place the emergency stop switch in the RUN position.
- Turn the main disconnect switch to the OFF position.
- Restore the wiring to the original configuration.
24 3 VDC
Results: The voltage is 24 3 VDC.
The output from the emergency stop switch is correct.
Proceed to Test Step 4
Results: The voltage is not 24 3 VDC at the output of the emergency stop switch.
Repair: There is a problem with the emergency stop switch. There may be a problem in the circuit for the supply voltage to the switch.
Perform the following procedure:
1. Check that the main circuit breaker is not thrown. Reset