(Table 191, contd)
Troubleshooting Test Steps
Values Results
5. Exchange the Injector Harness Under the Valve Mecha-
nism Cover
A. Turn the keyswitch to the OFF position. A strong electrical
shock hazard is present if the keyswitch is not turned OFF.
B. Remove the valve mechanism cover. Refer to Disassembly
and Assembly, “Valve Mechanism Cover - Remove and Install”
for the correct procedure.
C. Disconnect the connector for the suspect injector from the
cylinder head. Disconnect the connector from the adjacent
injector.
D. Exchange the two internal harnesses. Refer to Disassem-
bly and Assembly, “Electronic Unit Injector - Remove” and re-
fer to Disassembly and Assembly, “Electronic Unit Injector -
Install” for the correct procedure.
E. Turn the keyswitch to the ON position.
F. Perform the “Injector Solenoid Test” at least two times.
G. Restore the wiring to the normal positions.
Fault moves to
another injector
Result: Exchanging the harnesses causes the fault to
move to another injector - There is a fault with the suspect
injector harness under the valve mechanism cover.
Repair: Repair the suspect injector harness or replace the
suspect injector harness under the valve mechanism cover.
Use the electronic service tool in order to clear all logged di-
agnostic codes and then verify that the repair eliminates the
fault.
Result: The fault remains on the same injector when the
harness is exchanged - the injector may be faulty.
Repair: Replace the faulty injector. Refer to Disassembly
and Assembly, “Electronic Unit Injector - Remove” and Dis-
assembly and Assembly, “Electronic Unit Injector - Install”.
Perform the “Injector Solenoid Test” .
Use the electronic service tool to clear all logged diagnostic
codes and verify that the repair eliminates the fault.
6. Check the Wiring to the Cylinder Head for an Open
Circuit
A. Turn the keyswitch to the OFF position. A strong electrical
shock hazard is present if the keyswitch is not turned OFF.
B. Disconnect connector P2 from the ECM.
C. Thoroughly inspect the P2 connector. Refer to Trouble-
shooting, “Electrical Connectors - Inspect”.
D. Disconnect the connector for the suspect injector from the
cylinder head.
E. Use a multimeter to check the resistance between the ter-
minals on the suspect cylinder head connector and the termi-
nals on P2. Refer to Illustration 118 .
F. Install the removed connectors.
Less than 2 Ohms Result: One or more of the measured resistances is great-
er than 2 Ohms. The fault is in the wiring between the ECM
and the cylinder head connector.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic
codes and verify that the repair eliminates the fault.
Result: The measured resistances for the suspect injector
wiring are less than 2 Ohms.
Contact the Dealer Solutions Network (DSN).
7. Check the Wiring to the Cylinder Head for a Short
Circuit
A. Turn the keyswitch to the OFF position. A strong electrical
shock hazard is present if the keyswitch is not turned OFF.
B. Disconnect connector P2 from the ECM.
C. Thoroughly inspect the P2 connector. Refer to Trouble-
shooting, “Electrical Connectors - Inspect”.
Greater than 1 k
Ohm
Result: At least one of the resistance measurements is less
than 1 k Ohm - there is a short in the wiring between the re-
lay and the ECM.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic
codes and verify that the repair eliminates the fault.
Result: All resistance measurements are greater than 1 k
Ohm.
Contact the Dealer Solutions Network (DSN).
(continued)
UENR4469-36 351
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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