(Table 78, contd)
Troubleshooting Test Steps
Values
Results
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 ac-
tive with the P2 connector disconnected. Ignore all other diag-
nostic codes and only look for codes relating to the suspect
injectors.
E. Use the electronic service tool to check for active diagnostic
codes.
F. Turn the keyswitch to the OFF position.
Diagnostic
Codes
Result:
An XXX-5 diagnostic code is active with the P2 con-
nector disconnected.
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-6 diagnostic code is still active with the P2
connector 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 ac-
tive diagnostic codes.
Diagnostic
codes
Result:
There are no active diagnostic codes with the replace-
ment ECM.
Reconnect the suspect ECM. If the fault returns with the sus-
pect 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.
154
UENR0612
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