Jeep Liberty KJ. Manual — part 64
Diagnostic Test
•
When Monitored:
With the Ignition on.
•
Set Condition:
The BCM detects a Low condition on the Water In Fuel Sensor Signal Circuit.
Possible Causes
(K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO THE (K300) SENSOR GROUND CIRCUIT
WATER IN FUEL SENSOR
BCM
Diagnostic Test
1.
WATER IN FUEL SENSOR
Turn the ignition off.
Disconnect the Water in fuel sensor harness connector.
Turn the ignition on.
NOTE: Check connectors - Clean/repair as necessary.
Measure the voltage between the signal circuit and return circuit of the
WIF sensor harness connector.
Is the voltage between 4.5 and 5.5 volts?
Yes
>> Replace the Water in fuel sensor.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 2
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2.
(K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Disconnect the BCM C2 connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the (K303) Water In Fuel
Sensor Signal circuit.
Is the resistance less than 10 ohms?
Yes
>> Repair the (K303) Water In Fuel Sensor Signal circuit for a
short ground.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 3
3.
(K303) WATER IN FUEL SENSOR SIGNAL CIRCUIT SHORTED TO THE (K300) SENSOR GROUND
CIRCUIT
Disconnect the BCM C2 connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (K303) Water In Fuel Sensor Sig-
nal circuit and the (K300) Sensor Ground circuit.
Is the resistance less than 10 ohms?
Yes
>> Repair the (K303) Water In Fuel Sensor Signal circuit for a
short to the (K300) Sensor Ground circuit.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 4
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4.
BCM
NOTE: Before continuing, check the BCM 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.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Body Control Module per Service Information.
Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
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*4WD INDICATOR INACCURATE
For a complete wiring diagram Refer to Section 8W.
Possible Causes
4WD MODE SENSOR DTC PRESENT
INTERMITTENT CONDITION
TRANSFER CASE POSITION SENSOR
INSTRUMENT CLUSTER
Diagnostic Test
1.
4WD MODE SENSOR DTC PRESENT
NOTE: With the scan tool, ensure that the Instrument Cluster is configured for the correct transfer case
before proceeding with this test.
With the scan tool, read DTCs.
Does the scan tool display any 4WD Mode Sensor DTCs?
Yes
>> Refer to the DRIVEABILITY category and perform the appropriate symptom.
No
>> Go To 2
2.
INSTRUMENT CLUSTER
Perform the Instrument Cluster Self Test.
Depress and hold the Trip Odometer reset button while turning the ignition from the off to the on position.
Did the 4WD indicator in question illuminate?
Yes
>> Go To 3
No
>> Replace and configure the Instrument Cluster in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
3.
TRANSFER CASE POSITION SENSOR
Turn the ignition on.
With the scan tool in Sensors, read the T-Case Position while moving the transfer case shift lever through all of the
positions.
The scan tool should display the following values:
4WD Lo: 0.96 - 1.35 volts
Neutral: 2.39 - 2.76 volts
Full Time: 3.2 - 3.5 volts
Part Time: 3.7 - 4.0 volts
2WD: 4.17 - 4.45 volts
Is the Transfer Case Position voltage within the specified ranges?
Yes
>> The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire
harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wir-
ing harness and connector terminals.
No
>> Replace the Transfer Case Position Sensor in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2. (Refer to 9 - ENGINE - DIAGNOSIS AND
TESTING)
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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
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