(Table 191, contd)
Troubleshooting Test Steps
Values Results
3. Check the Harness between the ECM and 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 the connector for the suspect injector from the
cylinder head.
C. Fabricate a jumper wire 100 mm (4 inch) long with termi-
nals on both ends of the wire.
D. Insert one end of the jumper wire into the terminal for the
supply to the suspect injector. Insert the other end of the jump-
er wire into the terminal for the return circuit for the suspect
injector.
E. Turn the keyswitch to the ON position.
F. Perform the “Injector Solenoid Test” at least two times.
G. Repeat this test for each suspect injector. Stop the “Injector
Solenoid Test” before handling the jumper wires.
Suspect injector
indicates
“SHORT”
Result: The electronic service tool displays “SHORT” for
the cylinder with the jumper wire.
Proceed to Test Step 5.
Result: The electronic service tool does not display
“SHORT” for the cylinder with the jumper wire.
Proceed to Test Step 6.
4. Check the Harness between the ECM and 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 the connector for the suspect injector from the
cylinder head.
C. Turn the keyswitch to the ON position.
D. Perform the “Injector Solenoid Test” at least two times.
E. Repeat this test for each suspect injector. Stop the “Injector
Solenoid Test” before handling the jumper wires.
Suspect injector
indicates “OPEN”
Result: The electronic service tool displays “OPEN” for the
suspect cylinder and the cylinder that shares the same
connector.
Proceed to Test Step 5.
Result: The electronic service tool does not display
“OPEN” for the suspect cylinder
Proceed to Test Step 7.
(continued)
350 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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