(Table 78, contd)
Troubleshooting Test Steps
Values
Results
4. Create a Short at the ECM Connector
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 P2 connector.
C. Fabricate a jumper wire 100 mm (4 inch) long.
D. Install the jumper wire between the supply and return pins
for the suspect cylinder on the J2 connector. Refer to Illustra-
tion 34 for the correct terminals.
E. Turn the keyswitch to the ON position. Wait at least 30 sec-
onds for activation of the diagnostic codes.
Note:
Diagnostic codes for all of the engine sensors will be ac-
tive with the P2 connector disconnected. Ignore all other co-
des and only look for codes relating to the suspect injector.
F. Use the electronic service tool to check for active diagnostic
codes.
G. Turn the keyswitch to the OFF position.
H. Remove the jumper wire.
Diagnostic
codes
Result:
An XXX-6 diagnostic code is active with the jumper
installed.
The fault is in the wiring for the suspect injector.
Check all wiring between the suspect injector and the ECM.
Refer to the Electrical Schematic for the engine.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result:
An XXX-5 diagnostic code is still active with the jumper
installed.
Proceed to Test Step 7.
5. Create an Open Circuit at the Injector Connector or
Connectors
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 any suspect injectors.
C. Turn the keyswitch to the ON position. Wait at least 30 sec-
onds for activation of the diagnostic codes.
D. Use the electronic service tool to check for active diagnos-
tic codes.
E. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result:
An XXX-5 diagnostic code is active with the injectors
disconnected.
Thoroughly inspect the electrical connectors on the suspect in-
jectors and the harness connector for the suspect injectors. En-
sure that the connectors are free from corrosion. Reconnect the
connector for the injectors.
Start the engine.
If the fault is still present, replace the faulty injectors. Refer to
Disassembly and Assembly, “Electronic Unit Injector - Remove”
and Disassembly and Assembly, “Electronic Unit Injector -
Install”.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result:
An XXX-6 diagnostic code is still active with the injec-
tors disconnected.
Proceed to Test Step 6.
(continued)
UENR0612
153
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