Jeep Liberty KJ. Manual — part 504
3.
(K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K904) O2 Downstream Return circuit in the
2/2 O2 Sensor harness connector.
Is there any voltage present?
Yes
>> Repair the short to battery voltage in the (K904) O2 Down-
stream Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
O2 SENSOR
Turn the ignition off.
Connect the C2 PCM harness connector.
Connect a jumper wire between the (K243) O2 2/2 Signal circuit and
the (K904) O2 Downstream Return circuit in the 2/2 O2 Sensor harness
connector.
Ignition on, engine not running.
With a scan tool, monitor the 2/2 O2 Sensor voltage.
Is the voltage between 2.3 and 2.7 volts with the jumper wire
installed?
Yes
>> Replace the O2 Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
NOTE: Remove the jumper wire before continuing.
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
5.
(K243) O2 2/2 SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.
Measure the resistance of the (K243) O2 2/2 Signal circuit from the O2
Sensor harness connector to the appropriate terminal of special tool
#8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (K243) O2 2/2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
6.
(K904) O2 DOWNSTREAM RETURN CIRCUIT OPEN
Measure the resistance of the (K904) O2 Downstream Return circuit
from the O2 Sensor harness connector to the appropriate terminal of
special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K904) O2 Downstream Return cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 175
7.
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
P0159-O2 SENSOR 2/2 SLOW RESPONSE
For a complete wiring diagram Refer to Section 8W.
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 177
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