TRAY AS-FUEL DRAIN 4C6173 - Caterpillar

System Operation Description:Use this procedure in order to troubleshoot the emergency stop system or use this procedure if the diagnostic code in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
337-2 Remote Emergency Stop 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 digital return the emergency stop switch is not active and the engine will run. Refer to Illustration 1.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 start/run/stop switch 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.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.
Illustration 1 g01932596
Typical schematic
Illustration 2 g01258500
P1 ECM connector
(P1-5) Digital return
(P1-23) Emergency shutdown C
(P1-28) Emergency shutdown D
Illustration 3 g01258540
Connector "A"
(Terminal 21) Emergency shutdown D
(Terminal 23) Emergency shutdown C
(Terminal 25) Digital return
Illustration 4 g01258549
Connector "G"
(Terminal 3) Emergency shutdown D
(Terminal 7) Emergency shutdown C
(Terminal 37) Digital return
Illustration 5 g01234146
Location of ECM connectors
Test Step 1. Inspect Electrical Connectors and Wiring
Turn the breaker for the ECM to the OFF position.
Thoroughly inspect the ECM connectors J1/P1. Inspect all of the other connectors in the circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the proper procedure for inspecting system wiring.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Check the Status while the Emergency Stop Switch is Active
Connect Caterpillar Electronic Technician (ET) to