Jeep Liberty KJ. Manual — part 467
P0051-O2 SENSOR 2/1 HEATER CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is on.
•
Set Condition:
Desired state does not match Actual state. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(K199) O2 2/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
O2 SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
O2 SENSOR HEATER OPERATION
Turn the ignition off.
NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down before continuing the test. Allow
the O2 Sensor voltage to stabilize at 5.0 volts.
Ignition on, engine not running.
With a scan tool, actuate the O2 Heater Test.
With a scan tool, monitor 2/1 O2 Sensor voltage for at least 2 minutes.
Does the O2 Sensor voltage stay above 4.5 volts?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
O2 HEATER ELEMENT
Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down to room temperature.
Disconnect the 2/1 O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element, between the Heater Control terminal and the Heater
ground terminal at the component.
NOTE: O2 Heater Element resistance values should be measured at 70°F (21.1°C). The resistance value will
vary with different temperature values.
Is the O2 Sensor Heater Element resistance between 2.0 and 30.0 ohms?
Yes
>> Go To 3
No
>> Replace the O2 Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 27
3.
O2 SENSOR
Ignition on, engine not running.
With a scan tool, actuate the O2 Heater Test with the O2 Sensor har-
ness connector still disconnected.
Using a 12-volt test light connected to ground, probe the (K199) O2 2/1
Heater Control circuit in the O2 Sensor harness connector.
Does the test light illuminate brightly and flash on and off dur-
ing the actuation?
Yes
>> Replace the O2 Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K199) O2 2/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K199) O2 2/1 Heater
Control circuit in the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short to ground in the (K199) O2 2/1 Sensor
Heater Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
P0052-O2 SENSOR 2/1 HEATER CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 29
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