
(Table 84, contd)
Troubleshooting Test Steps
Values
Results
8. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the oxygen sensor connector. Disconnect the
P1 connector from the ECM.
C. Use a suitable multimeter to measure the resistance from
each terminal on the harness connector for the oxygen sensor
to every other terminal on the harness connector for the oxy-
gen sensor.
Greater than 1 k
Ohm
Result:
At least one of the resistance measurements is less
than 1 k Ohm.
There is a short circuit in the wiring between the oxygen sensor
connector and the ECM.
Check all wiring between the oxygen sensor and the ECM. Re-
fer to the Electrical Schematic for the application.
Repair the faulty wiring or 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:
All resistance measurements are greater than 1 k
Ohm.
Proceed to Test Step 9.
9. Check if a Replacement Sensor Eliminates the Fault
A. Replace the oxygen sensor. Refer to Disassembly and As-
sembly, “Oxygen Sensor - Remove and Install” for the correct
procedure.
B. Use the electronic service tool to perform the following
resets:
·
“
Lambda Sensor Replacement Reset
”
·
“
Lambda Sensor Learn Reset
”
·
“
Lambda Sensor Temperature Learn Reset
”
C. Turn the keyswitch to the ON position. If the engine will
start, run the engine for 15 minutes.
D. Use the electronic service tool to check for active diagnos-
tic codes that relate to the oxygen sensor.
E. Check for active diagnostic codes.
Diagnostic
codes
Result:
The fault is cleared with the replacement sensor
installed.
Use the electronic service tool to clear all logged diagnostic
codes.
Result:
The fault is still present with the replacement sensor.
Install the original sensor and proceed to Test Step 10.
10. 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.
i05934515
Power
Take-Off
-
Test
This
procedure
covers
the
following
diagnostic
code:
UENR0612
169
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