(Table 182, contd)
Troubleshooting Test Steps
Values Results
6. Check the Wiring Between the Relay and the ECM for a
Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector.
C. Inspect the P1/J1 connector. Refer to Troubleshooting,
“Electrical Connectors - Inspect”.
D. Disconnect the connector for the Electric Fuel Lift Pump
(EFLP) relay.
E. Measure the resistance between P1:7 and all other pins on
the P1 connector.
F. Measure the resistance between P1:49 and all other pins on
the P1 connector.
Greater than 1 k
Ohm
Result: At least one of the resistance measurements is less
than 1 k Ohm. The fault is in the wiring between the EFLP
relay and the ECM.
Repair: Repair the faulty wiring or replace the faulty
harness.
Turn the keyswitch to the ON position. Do not start the en-
gine. Check for active diagnostic codes.
Wait for at least 2 minutes for the EFLP to deactivate.
Check for active diagnostic codes.
Confirm that the fault has been eliminated.
Result: All resistance measurements are greater than 1 k
Ohm.
Contact the Dealer Solutions Network (DSN).
7. Check the Fuse
A. Turn the keyswitch to the ON position. Wait for 5 seconds.
B. Turn the keyswitch to the OFF position. Check the fuse for
the Electric Fuel Lift Pump (EFLP). Refer to the appropriate
Electrical Schematic.
Fuse blown Result: The fuse is blown.
Repair: Check the wiring between the batteries and the
EFLP relay for a short circuit. Refer to the appropriate Elec-
trical Schematic. Make any necessary repairs.
Replace the blown fuse.
Result: The fuse is not blown.
Proceed to Test Step 8.
8. Check the Power Supply to the Relay Connector
A. Disconnect the connector for the EFLP relay.
B. Measure the voltage between Test Point A on the harness
connector for the relay and a suitable ground.
Refer to Illustration 112 and the appropriate Electrical
Schematic.
Battery voltage Result: There is no battery voltage at Test Point A on the
harness connector.
Repair: Check all wiring between the batteries and the
EFLP relay. Make any necessary repairs.
Result: Battery voltage is present at Test Point A on the
harness connector.
Proceed to Test Step 9.
9. Check the Power Supply to the EFLP
A. Disconnect the connector for the EFLP. Ensure that the
EFLP relay is connected.
B. Turn the keyswitch to the ON position.
C. Measure the voltage between terminal 1 and terminal 2 on
the harness connector for the EFLP.
Battery voltage Result: There is no battery voltage at the harness connec-
tor for the EFLP.
Repair: Check all wiring between the EFLP relay and the
EFLP. Make any necessary repairs.
If the wiring is OK, replace the EFLP relay.
Result: Battery voltage is present at the EFLP harness
connector.
If the EFLP does not activate when the keyswitch is turned
to the ON position, replace the EFLP.
328 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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