Jeep Liberty KJ. Manual — part 60
OIL PRESSURE SENSOR FAULTED HIGH
For a complete wiring diagram Refer to Section 8W.
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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
KJ
Diagnostic Test
•
When Monitored:
With the ignition on.
•
Set Condition:
Oil Pressure Sensor voltage high.
Possible Causes
(K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN
(K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN
(K300) SENSOR GROUND CIRCUIT OPEN
OIL PRESSURE SENSOR
POWERTRAIN CONTROL MODULE (PCM)
Diagnostic Test
1.
OIL PRESSURE SENSOR VOLTAGE ABOVE 4.92 VOLTS
Start the engine.
With a scan tool, read the Oil Pressure Sensor voltage.
Is the voltage above 4.92 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.
OIL PRESSURE SENSOR
Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Connect a jumper wire between the (K302) Oil Pressure Sensor Signal
circuit and the (K300) Sensor ground circuit in the Sensor harness con-
nector.
Ignition on, engine not running.
With a scan tool, monitor the Oil Pressure Sensor voltage.
Is the voltage below 1.0 volt with the jumper wire installed?
Yes
>> Replace the Oil Pressure Sensor.
Perform the BODY VERIFICATION TEST. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 3
NOTE: Remove the jumper wire before continuing.
KJ
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
8J - 47
3.
(K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the BCM C2 harness connector.
Ignition on, engine not running.
Measure the voltage on the (K302) Oil Pressure Sensor Signal circuit in
the Oil Pressure Sensor harness connector.
Is the voltage above 5.2 volts?
Yes
>> Repair the short to battery voltage in the (K302) Oil Pres-
sure Sensor Signal circuit.
Perform the BODY VERIFICATION TEST. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 4
4.
(K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (K302) Oil Pressure Sensor Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (K302) Oil Pressure Sensor Signal
circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to
9 - ENGINE - STANDARD PROCEDURE)
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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
KJ
5.
(K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K301) 5–VOLT SUPPLY CIRCUIT
Disconnect the BCM C2 harness connector.
Measure the resistance between the (K302) Oil Pressure Sensor Signal
circuit and the (K301) 5-volt Supply circuit in the Oil Pressure Sensor
harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K301) 5-volt Supply circuit
and the (K302) Oil Pressure Sensor Signal circuit.
Perform the BODY VERIFICATION TEST. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 6
6.
(K300) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K300) Sensor ground circuit.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K300) Sensor ground circuit.
Perform the BODY VERIFICATION TEST. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
KJ
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
8J - 49
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