Table 74
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 volt-
age 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 Illus-
tration 53 or 54 .
EFLP flow Result: The fuel flow is below the minimum value for the
recorded voltage.
Repair: Replace the EFLP. Refer to Disassembly and As-
sembly, “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.
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.
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.
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”.
Result: The CAN data link is OK.
Proceed to Test Step 8.
(continued)
UENR4469-36 151
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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