(Table 76, contd)
Troubleshooting Test Steps
Values
Results
4. Check the Oxygen Sensor for Faults
A. Connect the electronic service tool to the diagnostic
connector.
B. Turn the keyswitch to the ON position.
C. Check for active or recently logged diagnostic codes for the
oxygen sensor.
10 V to 14 V
Result:
There are no diagnostic codes for the oxygen sensor.
Proceed to Test Step 5.
Result:
There are diagnostic codes for the oxygen sensor
Troubleshoot the oxygen sensor before returning to this proce-
dure. Refer to Troubleshooting, “Oxygen Level - Test”.
5. Enter the Injector Code for the Suspect Cylinder
A. Connect the electronic service tool to the diagnostic con-
nector. Refer to Troubleshooting, “Electronic Service Tools”.
B. Turn the keyswitch to the ON position.
C. Manually enter the injector code for the suspect cylinder us-
ing the electronic service tool. Refer to Troubleshooting, “In-
jector Code - Calibrate”.
D. Use the electronic service tool to clear all active diagnostic
codes.
E. Start the engine.
F. Use the electronic service tool to check for active diagnostic
codes.
G. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result:
There are no active XXX-20 or XXX-21 diagnostic co-
des for the injectors.
Return the engine to service.
Result:
The XXX-20 or XXX-21 diagnostic code is still active.
Proceed to Test Step 6.
6. Replace the Suspect Injector
A. Replace the injector for the cylinder with the XXX-20 or
XXX-21 diagnostic code. Refer to Disassembly and Assembly,
“Electronic Unit Injector - Remove” and refer to Disassembly
and Assembly, “Electronic Unit Injector - Install”.
B. Use the electronic service tool to input the code for the new
injector. Refer to Troubleshooting, “Injector Code - Calibrate”.
C. Use the electronic service tool to check for active diagnos-
tic codes.
Diagnostic
Codes
Result:
There are no active XXX-20 or XXX-21 diagnostic co-
des for the injectors.
Return the engine to service.
Result:
The XXX-20 or XXX-21 diagnostic code is still active.
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, “Replac-
ing the ECM”.
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.
UENR0612
149
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