Troubleshooting

(Table 78, contd)
Troubleshooting Test Steps
Values Results
3. Create a Short at the Injector 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 connector from the suspect injector.
C. Fabricate a jumper wire 100 mm (4 inch) long.
D. Install the jumper wire between terminal 1 and terminal 2
on the harness connector for the suspect injector.
E. Start the engine. Wait at least 30 seconds for activation of
the diagnostic codes.
F. Use the electronic service tool to check for active diagnos-
tic codes.
G. Turn the keyswitch to the OFF position.
H. Remove the jumper wire.
Diagnostic
codes
Result: A -6 diagnostic code was active with the jumper
installed.
Repair: Thoroughly inspect the electrical connector on the
suspect injector and the harness connector for the suspect in-
jector. Ensure that the connectors are free from corrosion. Re-
connect the connector for the suspect injector.
Start the engine.
If the fault is still present, replace the faulty injector. Refer to
Disassembly and Assembly, “Electronic Unit Injector - Re-
move” and Disassembly and Assembly, “Electronic Unit Injec-
tor - Install”.
Use the electronic service tool to clear all logged diagnostic co-
des and verify that the repair eliminates the fault.
Result: A -5 diagnostic code is still present with the jumper
installed.
Proceed to Test Step 4.
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
active with the P2 connector disconnected. Ignore all other
codes and only look for codes relating to the suspect injector.
F. Use the electronic service tool to check for active diagnos-
tic codes.
G. Turn the keyswitch to the OFF position.
H. Remove the jumper wire.
Diagnostic
codes
Result: A -6 diagnostic code is active with the jumper
installed.
The fault is in the wiring for the suspect injector.
Repair: 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: A -5 diagnostic code is still active with the jumper
installed.
Proceed to Test Step 7.
(continued)
UENR0612-07 157
Circuit Tests
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