Troubleshooting

(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 sen-
sor to every other terminal on the harness connector for the
oxygen 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
active 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.
i06230595
Power Take-Off - Test
This procedure covers the following diagnostic code:
174 UENR0612-07
Circuit Tests
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