SEAL-O-RING 8M8515 - Caterpillar

System Operation Description:Use this procedure in order to troubleshoot the electrical system if a problem is suspected with the customer's emergency stop switch. Use this procedure if the diagnostic code in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
E264(3) Emergency Stop Activated The two inputs from the customer's emergency stop switch are in a high state. The code is logged. Fuel injection is disabled. The drive for the air shutoff is activated.
337-2 Remote Emergency Stop Switch : Erratic, Intermittent, or Incorrect The two inputs from the customer's emergency stop switch are in opposite states. The code is logged. The customer's emergency stop switch sends two signals to the Electronic Control Module (ECM). The emergency stop inputs from the customer are on terminals U and T of the customer connector. The signals are used to determine if the customer's emergency stop switch is active. The customer's emergency stop switch is active when the switch is in the open state and the two signals are high. The customer's emergency stop switch is inactive when the switch is in the closed state and the two signals are held low.If the ECM is powering up and one of the signals from the customer's emergency stop switch is in a different state from the other signal, the ECM determines that one of the signals is faulty. If one of the signals from the customer's emergency stop switch is in a different state from the other signal, the ECM will generate a diagnostic code that remains active until power to the ECM is cycled. The ECM will not allow the crank cycle to begin if the signals are opposite of each other. The ECM will allow the engine to be started manually in this state.The ECM monitors the inputs from the customer's emergency stop switch at all times. If the engine is running and one of the signals from the customer's emergency stop switch changes states, the engine will continue to run. The ECM initiates an emergency stop shutdown only when both signals are high during engine operation.The ECM will not allow the starting sequence to begin when the customer's emergency stop switch is activated. The engine will not be able to restart until the following conditions are met:
The engine rpm must equal zero.
The inputs from the customer's emergency stop switch must go low.
The ECM has been reset.The electrical power to the input for the keyswitch must be turned OFF for 15 seconds in order to reset the engine ECM after an emergency stop condition.Note: If one of the inputs from the customer's emergency stop switch is in a different state from the other signal, the Caterpillar Electronic Technician (ET) will display the warning "INVALID DATA".
Illustration 1 g01597037
Typical schematic
Illustration 2 g01218361
P1 ECM connector
(P1-5) Digital return
(P1-23) Emergency stop signal 1
(P1-28) Emergency stop signal 2
Illustration 3 g01323796
Terminal locations for the TB-C1/C-C18 customer connector
(Terminal U) "E-Stop 1"
(Terminal T) "E-Stop 2"
Illustration 4 g01337991
Connector locations
(1) A-C1/E-C2 RH rigid harness connectors
(2) A-C2/J-C2 RH