(Table 84, contd)
Troubleshooting Test Steps
Values
Results
5. Check the Resistance of the Oxygen Sensor Heater
A. Turn the keyswitch to the OFF position.
B. Disconnect the oxygen sensor.
C. Measure the resistance between pin 3 and pin 4 on the oxy-
gen sensor.
Note:
Allow the oxygen sensor to cool before performing this
measurement.
2.4 to 4 Ohms
Result:
The measured resistance is not within the expected
range.
Replace the oxygen sensor. Refer to Disassembly and Assem-
bly, “Oxygen Sensor - Remove and Install”. Use the electronic
service tool to perform the following resets:
·
“
Lambda Sensor Replacement Reset
”
·
“
Lambda Sensor Learn Reset
”
·
“
Lambda Sensor Temperature Learn Reset
”
Use the electronic service tool to clear all logged diagnostic co-
des. Run the engine for 15 minutes and use the electronic serv-
ice tool to verify that the repair eliminates the fault.
Result:
The measured resistance is within the expected range.
Proceed to Test Step 6.
6. Check the Sensor Heater Ground Wire
A. Turn the keyswitch to the OFF.
B. Disconnect the oxygen sensor. Disconnect the P1 connec-
tor from the ECM.
C. Use a suitable multimeter to measure the resistance be-
tween terminal 3 on the harness connector for the oxygen sen-
sor and P1:7.
Less than 5
Ohms
Result:
The measured resistance is greater than 5 Ohms.
The fault is in the wiring between the oxygen sensor and the
ECM.
Check all of the wiring between the oxygen sensor and the
ECM. Refer 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. Run the engine for 15 minutes and use the electronic serv-
ice tool to verify that the repair eliminates the fault.
Result:
The measured resistance is less than 5 Ohms.
If a 3222 diagnostic code is active, proceed to Test Step 10.
If a 3217 diagnostic code is active, return all wires to the origi-
nal configuration and proceed to Test Step 7.
7. Check the Wiring for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the oxygen sensor. Disconnect the P1
connector.
C. Use a suitable multi meter to measure the resistance be-
tween the following points:
·
Terminal 1 on the oxygen sensor connector to P1:64
·
Terminal 2 on the oxygen sensor connector to P1:85
·
Terminal 5 on the oxygen sensor connector to P1:86
·
Terminal 6 on the oxygen sensor connector to P1:63
Less than 5
Ohms
Result:
At least one of the resistance measurements is greater
than 5 Ohms. There is an open circuit or high resistance in the
wiring between the oxygen sensor connector and the P1
connector.
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 less than 5 Ohms.
Proceed to Test Step 8.
(continued)
168
UENR0612
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