Troubleshooting

(Table 78, contd)
Troubleshooting Test Steps
Values Results
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: A -5 diagnostic code is active with the injectors
disconnected.
Repair: Thoroughly inspect the electrical connectors on the
suspect injectors and the harness connector for the suspect in-
jectors. Ensure 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 - 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 -6 diagnostic code is still active with the injectors
disconnected.
Proceed to Test Step 6.
6. Create an Open Circuit 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 connector P2 from the ECM.
C. Thoroughly inspect the P2 connector. Refer to Trouble-
shooting, “Electrical Connectors - Inspect”.
D. Turn the keyswitch to the ON position. Wait for at least 30
seconds 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 di-
agnostic codes and only look for codes relating to the suspect
injectors.
E. Use the electronic service tool to check for active diagnos-
tic codes.
F. Turn the keyswitch to the OFF position.
Diagnostic
Codes
Result: A -5 diagnostic code is active with the P2 connector
disconnected.
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 -6 diagnostic code is still active with the P2 connec-
tor disconnected.
Proceed to Test Step 7.
7. Check if a Replacement ECM Eliminates the Fault
A. Contact the Dealer Solution Network (DSN).
B. If the DSN recommends the use of a replacement ECM, in-
stall a replacement ECM. Refer to Troubleshooting, “ECM -
Replace”.
C. Use the electronic service tool to recheck the system for
active diagnostic codes.
Diagnostic
codes
Result: There are no active diagnostic codes with the replace-
ment ECM.
Repair: Reconnect the suspect ECM. If the fault returns with
the suspect ECM, replace the ECM.
Use the electronic service tool in order to clear all logged diag-
nostic codes and then verify that the repair eliminates the fault.
Result: The diagnostic code is still present with the replace-
ment ECM.
Contact the DSN.
158 UENR0612-07
Circuit Tests
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