Troubleshooting

Table 84
Troubleshooting Test Steps
Values Results
1. Check for Active or Recently Logged Diagnostic
Codes
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic
connector.
C. Turn the keyswitch to the ON position. If the engine will
start, run the engine for 15 minutes or until one of the diag-
nostic codes listed in Table 83 is active.
D. Use the electronic service tool to check for active or re-
cently logged diagnostic codes.
E. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: There are other active or recently logged diagnostic
codes that are not listed in this procedure.
Troubleshoot all other diagnostic codes before returning to this
procedure. Refer to Troubleshooting, “Diagnostic Trouble
Codes”
Result: Only diagnostic codes that are listed in this procedure
are active or recently logged.
Proceed to Test Step 2.
2. Inspect Electrical Connectors And Wiring
A. Check the fuses.
B. Thoroughly inspect the connector for the oxygen sensor.
Refer to Troubleshooting, “Electrical Connectors - Inspect”.
C. Thoroughly inspect the P1/J1 ECM connector. Refer to
Troubleshooting, “Electrical Connectors - Inspect”.
D. Perform a 30 N (6.7 lb) pull test on each of the wires in the
connectors that are associated with the oxygen sensor.
E. Check the harness for abrasions and for pinch points from
the oxygen sensor back to the ECM and from the oxygen sen-
sor to the battery supply.
Damaged wire
or connector
Result: A damaged wire or damaged connector was found. A
fuse is blown.
Repair the damaged wire or the damaged connector. Replace
any blown fuses
Use the electronic service tool in order to clear all logged diag-
nostic codes. Run the engine for at least 15 minutes and check
for active diagnostic codes to ensure that the repair eliminates
the fault.
Result: All connectors, pins, and sockets are correctly con-
nected and/or inserted and the harness is free of corrosion, of
abrasion or of pinch points.
Proceed to Test Step 3.
(continued)
UENR0612-07 171
Circuit Tests
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