CAGE 5S5725 - Caterpillar

Use this procedure to troubleshoot a problem with clean fuel module. Also, use this procedure if one of the following diagnostic codes is active or easily repeated.
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 (CFM) 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 CFM 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 CFM electric lift pump is not working properly.
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"
Illustration 1 g03743610
(1) Clean Fuel Module (CFM) pump
(2) Fuel transfer pump
(3) High-pressure fuel pump
(4) Tank
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
Table 4
Troubleshooting Test Steps Values Results
1. Check the Fuel System for Leaks
A. Inspect the fuel system components for restrictions:
- Lines
- Tank
- Transfer pump
B. Refer to Testing and Adjusting, "Fuel System Inspection" for additional information.
Leaks
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 any associated codes before continuing with this test.
Result: An associated code not is active.
Proceed to Test Step 3.
3. Check for Codes
A. Connect Cat ET.
B. Check for active event codes.
Codes
Result: An E1569, 1381, or 5417 code is active.
Proceed to Test Step 4.
Result: Both an E1569 or 5417 and an E2172 or 1381 are active.
Proceed to Test Step 4.
Result: An E2172 or 1381 is active.
Proceed to Test Step 9.
4. Check for Supply Voltage at the Clean Fuel Module Pump (CFM) Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the wiring harness from the CFM pump.
C. Connect Cat ET.
D. Use Cat ET to perform the following override:
-"Electric Fuel Transfer Pump Relay Override"
E. Measure the voltage between the following pins on the CFM pump connector:
- Pin 2 and Pin 3
- Pin 2 and Pin 4
Voltage
Result: The