Jeep Liberty KJ. Manual — part 503
3.
O2 SENSOR
Measure the voltage on the (K904) O2 Downstream Return circuit in the
O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes
>> Replace the O2 Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K904) O2 Down-
stream Return circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K904) O2 Downstream
Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
5.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Measure the resistance between ground and the (K243) O2 2/2 Signal
circuit in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (K243) O2 2/2 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
KJ
6.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 DOWNSTREAM RETURN CIRCUIT
Measure the resistance between the (K243) O2 2/2 Signal circuit and
the (K904) O2 Downstream Return circuit in the O2 Sensor harness
connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K904) O2 Downstream
Return circuit and the (K243) O2 2/2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
7.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO THE (Z42) O2 2/2 HEATER GROUND CIRCUIT
Measure the resistance between the (K243) O2 2/2 Signal circuit and
the (Z42) O2 2/2 Heater ground circuit in the O2 Sensor harness con-
nector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (Z42) O2 2/2 Heater ground
circuit and the (K243) O2 2/2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
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)
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 171
P0158-O2 SENSOR 2/2 CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W.
9 - 172
ENGINE ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
O2 Sensor Heater Temperature is greater than 496°C (925°F) and battery voltage greater than 10.99 volts.
•
Set Condition:
The Oxygen Sensor voltage is above 3.99 volts for 40 seconds. One Trip Fault. Three good trips to turn off the
MIL.
Possible Causes
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K904) O2 DOWNSTREAM RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE
(K243) O2 2/2 SIGNAL CIRCUIT OPEN
(K904) O2 DOWNSTREAM RETURN CIRCUIT OPEN
O2 SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
O2 SENSOR ABOVE 3.99 VOLTS
NOTE: When only one O2 Sensor is shorted to voltage, the scan tool will display all O2 Sensor voltage
readings at approximately 5.0 volts. When diagnosing this DTC, only diagnose the O2 Sensor that set the
DTC.
Start the engine.
Allow the engine to reach normal operating temperature.
With a scan tool, read the 2/2 O2 Sensor voltage.
Is the voltage above 3.99 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.
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Start the engine and allow the engine to idle.
Disconnect the 2/2 O2 Sensor harness connector.
Measure the voltage on the (K243) O2 Sensor 2/2 Signal circuit in the
O2 Sensor harness connector.
NOTE: Measure the voltage in reference to ground, not the (K904)
O2 Downstream Return circuit.
Is the voltage above 5.2 volts?
Yes
>> Repair the short to battery voltage in the (K243) O2 Sensor
2/2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
KJ
ENGINE ELECTRICAL DIAGNOSTICS
9 - 173
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