NIPPLE 6B3156 - Caterpillar

Use this procedure to troubleshoot the fuel system if a problem is suspected with the fuel actuator. Also, use this procedure if one of the following diagnostic codes is active or easily repeated.
Table 1
Diagnostic Codes Table
J1939 Code and Description Conditions which Generate this Code System Response
1442-9
Engine Fuel Valve #1 Position : Abnormal Update Rate There is a communication issue between the fuel valve and the ECM. The code is logged.
The amber warning lamp is activated.
5418-7
Engine Fuel Actuator #1 : Not Responding Properly There is a mismatch between the fuel position requested by the command signal and the actual position of the fuel valve. The problem is reported by the fuel actuator. The code is logged.
The amber warning lamp is activated.
5418-12
Engine Fuel Actuator #1 : Failure The fuel actuator has reported an internal failure. The code is logged.
The amber warning lamp is activated.
Table 2
Required Tools
Part Number Part Name Quantity
105-3805 Receptacle As 1
105-3806 Contact 1
239-5260 Crimp Tool 1
329-5658 Crimp Die Set 1 The fuel actuator is an electronic actuator. The actuator works with the Electronic Control Module (ECM) to ensure the correct fuel position during all engine operating conditions.The ECM modulates the fuel valve from a fully closed position to a fully opened position.CommunicationsThe ECM and the fuel actuator communicate via the CAN data link. The ECM sends a command signal to the actuator. The actuator sends the following information to the ECM: desired actuator position, actual actuator position and internal fault diagnosis.If the ECM cannot communicate with the actuator, the ECM activates a 1442-9 diagnostic code. The problem may be with the power supply to the actuator. This code may be generated for an intermittent problem. After checking the power circuit for the actuator, refer to Troubleshooting, "CAN Data Link - Test" for information that is related to troubleshooting the data link circuitry.Self-diagnostic Function If an internal fault is detected by the actuator, the condition is communicated via the CAN data link. The ECM activates a 5418-12 diagnostic code. The most likely cause of a 5418-12 diagnostic code is an electrical problem or a mechanical problem.
Illustration 1 g03323345
Schematic for the circuit of the fuel actuator
Illustration 2 g03324527
Pipe thread design
Location of the fuel actuator (right-hand side engine view)
Table 3
Troubleshooting Test Steps Values Results
1. Check for Active Codes and Logged Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector.
B. Restore electrical power to the ECM.
C. Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
D. Turn the main disconnect switch to the OFF position.
Codes
Result: A code is not active or logged.
Repair: 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".
Result: A 5418-7 code is active or logged.
Proceed to Test Step 2.
Result: A 5418-12 code is logged.
The actuator may have detected an internal problem with the actuator electronics.
Proceed to Test Step 2.
Result: A 5418-12