C175 Oil&Gas Offshore Engine Caterpillar

Clean Fuel Module - Test

Usage:

Use this procedure to troubleshoot a problem with clean fuel module. Or, use this procedure if one of the following diagnostic codes is active.

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Table 1
J1939 Code and Description	CDL Code and Description	Comments
1381-17 Engine Fuel Supply Pump Inlet Pressure : Low - least severe (1)	E2172 (1) Engine Fuel Supply Pump Inlet Pressure : Low - least severe (1)	The fuel transfer pump inlet pressure is too low.
1381-18 Engine Fuel Supply Pump Inlet Pressure : Low - moderate severity (2)	E2172 (2) Engine Fuel Supply Pump Inlet Pressure : Low - moderate severity (2)	The fuel transfer pump inlet pressure is too low.
5417-0 Fuel Filter (Suction Side) Intake Pressure : High - most severe (3)	E1569 (3) Low Electric Fuel Transfer Pump Outlet Pressure	The Clean Fuel Module electric lift pump is not working properly.
5417-17 Fuel Filter (Suction Side) Intake Pressure : Low - least severe (1)	E1569 (1) Low Electric Fuel Transfer Pump Outlet Pressure	The Clean Fuel Module electric lift pump is not working properly.
5417-18 Fuel Filter (Suction Side) Intake Pressure : Low - moderate severity (2)	E1569 (2) Low Electric Fuel Transfer Pump Outlet Pressure	The Clean Fuel Module electric lift pump is not working properly.

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Table 2
Associated Codes
J1939 Codes	CDL Codes	Troubleshooting Procedure
931-5	1627-5	Troubleshooting, "Fuel Priming Pump - Test"
931-6	1627-6	Troubleshooting, "Fuel Priming Pump - Test"
7102-5	4550-5	Troubleshooting, "Fuel Priming Pump - Test"
7102-6	4550-6	Troubleshooting, "Fuel Priming Pump - Test"
1382-16	E1129	Troubleshooting, "Fuel Filter Is Restricted"

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Illustration 1	g03743610
(1) CFM Pump (2) Fuel Transfer Pump (3) High-Pressure Fuel Pump (4) Tank

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Table 3
Component	Electrical Checkout
Engine Fuel Supply Pump Actuator	Fuel Pump Relay Command Override
Engine Fuel Filter Circulating Pump (CFM)	Electric Fuel Transfer Pump Relay Override

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Table 4
Troubleshooting Test Steps	Values	Results
1. Inspect the Fuel System for Leaks A. Perform a visual inspection of the fuel system. Verify that there are no fuel leaks. Inspect the fuel lines from the fuel tank to the fuel transfer pump for restrictions. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect", for additional information.	Leaks in the Fuel System	Result: No leaks were found. Proceed to Test Step 2. Result: Leaks were found in the fuel system. Repair: Repair the leaks. Verify that the problem is resolved.
2. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the service tool connector. B. Check for an active associated code.	Codes	Result: An associated code is active. Repair: Troubleshoot the associated code. Result: There are no associated codes. Proceed to Test Step 3.
3. Check for Event Codes A. Connect Cat ET. C. Look for active codes that are associated with the system for the event code.	Event Codes	Result: An E1569, 1381, or 5417 code is present. Proceed to Test Step 4. Result: Both an E1569 or 5417 AND an E2172 or 1381 are present together. Proceed to Test Step 4. Result: An E2172 or 1381 is present. Proceed to Test Step 9.
4. Check for Power to the Clean Fuel Module Pump A. Turn the keyswitch to the OFF position. B. Disconnect the wiring harness from the clean fuel module pump. C. Turn the keyswitch to the ON position. D. Connect Cat ET. E. Use the "Electric Fuel Transfer Pump Relay Override" to energize the clean fuel module fuel pump. F. Measure the voltage between pin 2 and pin 3 on the connector for the clean fuel module pump. G. Measure the voltage between pin 2 and pin 4 on the connector for the clean fuel module pump.	System Voltage	Result: The voltage at the clean fuel pump module connector is equal to system voltage. Proceed to Test Step 5. Result: The voltage at the clean fuel pump module connector is NOT equal to system voltage. There is a problem with the power supply circuit between the clean fuel module pump connector and the battery supply. Check the circuit protection device, clean fuel module (CFM) relay, and the ground for the clean fuel module pump circuit. Refer to the appropriate wiring diagram to troubleshoot the circuit.
5. Inspect the Fuel Supply Lines for Restrictions A. Visually inspect the fuel lines between the fuel tank and the inlet to the clean fuel module. Inspect the lines for restrictions, pinching, and swelling. Refer to Systems Operation/Testing and Adjusting, "Fuel System - Inspect", for additional information. B. Check for plugged fuel tank vent lines or a plugged fuel tank suction screen.	Dirt and Debris or Damage	Result: The fuel lines, tank vent, and suction screen are OK. Proceed to Test Step 6. Result: The fuel lines, tank vent, and suction screen are NOT OK. Repair: Replace damaged fuel lines. Verify that the problem has been resolved.
6. Prime the Fuel System A. Remove the air in the fuel system by performing a priming cycle. B. Refer to the Operation and Maintenance Manual for instructions.	Priming	Result: The fuel system is primed. Proceed to Test Step 7.
7. Check the Clean Fuel Module Pump Pressure A. Turn the keyswitch to the OFF position. B. Remove the clean fuel module outlet pressure sensor. C. Connect a fuel pressure gauge to the port where the sensor was removed from the clean fuel module. D. Turn the keyswitch to the ON position. E. Connect Cat ET. F. Use the "Electric Fuel Transfer Pump Relay Override" to turn on the clean fuel module fuel pump. G. Monitor the fuel pressure on the gauge.	30 kpa – 150 kpa (4 PSI – 21.5 PSI)	Result: The clean fuel module pump pressure is within specification. Proceed to Test Step 8. Result: The clean fuel module pump pressure is NOT within specification. A failed clean fuel module pump has been detected. Repair: Replace the clean fuel module pump. Proceed to Test Step 12.
8. Check for Proper Clean Fuel Module Pump Operation A. Turn the keyswitch to the ON position. B. Connect Cat ET. C. Start the engine and allow engine to run for at least 10 minutes. D. Monitor the "Fuel Temperature" parameter in the status screen. E. The "Fuel Temperature" must be greater than 15° C (59° F). F. Check for active diagnostic codes. Note: Enablement conditions for this fault code require at least 10 minutes of engine run time, and fuel temperature must be greater than 15° C (59° F).	Codes	Result: No codes are active. Return to service. Result: An E1569 or 5417 code is present. Refer to Troubleshooting, "Fuel Pressure Is Low – Fuel Transfer System".
9. Prime the Fuel System A. Remove the air in the fuel system by performing a priming cycle. B. Refer to the Operation and Maintenance Manual for instructions.	Priming	Result: The fuel system is primed. Proceed to Test Step 10.
10. Inspect the Fuel Supply Lines for Restrictions A. Visually inspect the fuel lines between the clean fuel module and the fuel transfer pump. Inspect the lines for restrictions, pinching, and swelling. Systems Operation/Testing and Adjusting, "Fuel System - Inspect", for additional information.	Dirt and Debris or Damage	Result: The fuel lines are OK. Proceed to Test Step 11. Result: The fuel lines are not OK. Repair: Replace damaged fuel lines. Verify that the problem has been resolved.
11. Check the Fuel Pressure at the Fuel Transfer Pump A. Start the engine. B. Connect Cat ET. C. Allow the engine to reach normal operating temperature. D. Run the engine to high idle. E. Monitor the "Fuel Transfer Pump Intake Pressure" in Cat ET.	Fuel Transfer Pump Intake Pressure	Result: The "Fuel Transfer Pump Intake Pressure" is greater than 0 PSI. Proceed to Test Step 12. Result: The "Fuel Transfer Pump Intake Pressure" is less than 0 PSI. A failed clean fuel module pump has been detected. Repair: Replace the clean fuel module pump. Proceed to Test Step 12.
12. Check for Proper Fuel System Operation A. Turn the keyswitch to the ON position. B. Connect Cat ET. C. Start the engine and allow the engine to run for at least 5 minutes. D. Check for active diagnostic codes.	Codes	Result: No codes are active. Return to service.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).