ENGINE AR-PRIMARY 3131216 - Caterpillar

Illustration 8 g02527518
Minimum EFLP flow rate in a 24 VDC system
Table 3
Troubleshooting Test Steps Values Results
4. EFLP Flow Test at the Primary Fuel Filter Inlet
A. Make sure the keyswitch is in the OFF position.
B. Disconnect the fuel inlet connection from the primary fuel filter head.
C. Install a suitable blank on the fuel inlet port on the primary fuel filter head.
D. Place the open end of the fuel inlet line in a suitable calibrated container.
E. With the keyswitch in the ON position, measure the input voltage at the EFLP. Record the result.
F. With the keyswitch in the ON position, measure the flow from the fuel inlet line. Record the result.
G. Check the recorded voltage and fuel flow on the graph in Illustration 7 or 8.
EFLP flow
Result: The fuel flow is below the minimum value for the recorded voltage.
Repair: Replace the EFLP. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install".
Result: The fuel flow is above the minimum value for the recorded voltage.
Proceed to Test Step 5.
5. Check the Return Fuel Lines
A. Make sure that the TPIR return line is not blocked or kinked.
B. If the TPIR return line is clear, confirm that the Electric Fuel Lift Pump (EFLP) is operating. Make sure that fuel lines between the EFLP and the TPIR are not blocked or kinked.
Return lines
Result: The TPIR return line or the fuel lines between the EFLP and the TPIR are blocked or kinked.
Repair: Clear or replace the blocked line.
Proceed to Test Step 13.
Result: The TPIR return line and the fuel lines between the EFLP and the TPIR are clear.
Repair: Replace the EFLP.
If the fault is still present, proceed to Test Step 6.
If the fault is eliminated, proceed to Test Step 13.
6. Throttle Signal
A. Use the electronic service tool and observe the signal for the throttle. Make sure that the throttle response is smooth and progressive.
Throttle
Result: The throttle signal is erratic.
Repair: Refer to the appropriate circuit test for the type of throttle that is installed.
Proceed to Test Step 13.
Result: The throttle response is OK.
Proceed to Test Step 7.
7. Check the CAN Data Link
Note: The requested engine speed signal is sent to the engine ECM through the CAN data link.
A. Use the electronic service tool to check for diagnostic codes that are related to the CAN data link.
Throttle
Result: The CAN data link is suspect.
Repair: Test the CAN data link. Refer to Troubleshooting, "CAN Data Link - Test".
Proceed to Test Step 13.
Result: The CAN data link is OK.
Proceed to Test Step 8.
8. High-Pressure Fuel Pump SCV
A. Use the electronic service tool to perform a solenoid test on the fuel injection pump. Refer to Troubleshooting, "Solenoid Valve - Test".
HP fuel pump
Result: The solenoid valve test fails.
Repair: Replace the HP fuel pump SCV and solenoid assembly.
Proceed to Test Step 13.
Result: The solenoid valve test passes successfully.
Proceed to Test Step 9.
9. High-Pressure Fuel Pump
Note: The fuel injection pump that is installed by the factory is a nonserviceable item. If any fault occurs within the fuel injection pump, the fuel injection pump