Jeep Liberty KJ. Manual — part 69
*LOW COOLANT INDICATOR INOPERATIVE - DIESEL ONLY
For a complete wiring diagram Refer to Section 8W.
Possible Causes
LOW COOLANT SWITCH
(G18) LOW COOLANT FLUID LEVEL SENSE CIRCUIT OPEN
(Z939 )LOW COOLANT SWITCH GROUND CIRCUIT OPEN
INSTRUMENT CLUSTER
Diagnostic Test
1.
LOW COOLANT SWITCH
NOTE: Perform the Instrument Cluster Self Test before proceeding with this test. If the Indicator does not
illuminate, replace the Cluster.
Turn the ignition off.
Disconnect the Low Coolant Switch harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
Turn the ignition on and wait approximately 1 minute.
With the scan tool in Inputs/Outputs, read the Low Coolant Switch state.
Does the scan tool display: Closed?
Yes
>> Replace the Low Coolant Switch in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
No
>> Go To 2
2.
(Z939) LOW COOLANT SWITCH GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Low Coolant Switch harness connector.
Measure the resistance between ground and the (Z939) Low Coolant
Switch Ground circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (Z939) Low Coolant Switch Ground circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 3
8J - 82
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
KJ
3.
(G18) LOW COOLANT FLUID LEVEL SENSE CIRCUIT OPEN
Turn the ignition off.
Disconnect the Low Coolant Switch harness connector.
Disconnect the Instrument Cluster harness connector.
Measure the resistance of the (G18) Low Coolant Fluid Level Sense cir-
cuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the (G18) Low Coolant Fluid Level Sense circuit for
an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
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)
KJ
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
8J - 83
*LOW WASH MESSAGE NOT OPERATING PROPERLY
For a complete wiring diagram Refer to Section 8W.
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INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
KJ
Possible Causes
WASHER FLUID LEVEL SWITCH ALWAYS CLOSED
(W1) LOW WASHER FLUID SENSE CIRCUIT OPEN
(W1) LOW WASHER FLUID SENSE CIRCUIT SHORT TO GROUND
WASHER FLUID LEVEL SWITCH ALWAYS OPEN
(Z931) WASHER FLUID LEVEL SWITCH GROUND CIRCUIT OPEN
INSTRUMENT CLUSTER
Diagnostic Test
1.
FAULT DESCRIPTION
NOTE: Ensure that the Washer Fluid reservoir is filled and the Fluid Level Switch connector is properly
connected before proceeding with this test.
Turn the ignition on and wait approximately 1 minute.
Is the LOWASH message always displayed?
Yes
>> Go To 2
No
>> Go To 3
2.
WASHER FLUID LEVEL SWITCH ALWAYS CLOSED
Turn the ignition off.
Disconnect the Washer Fluid Level Switch harness connector.
Turn the ignition on and wait approximately 1 minute.
Does the VF display: LOWASH?
Yes
>> Repair the Low Washer Fluid Sense circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the Washer Fluid Level Switch in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
3.
WASHER FLUID LEVEL SWITCH ALWAYS OPEN
Turn the ignition off.
Disconnect the Washer Fluid Level Switch harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
Turn the ignition on and wait approximately 1 minute.
Does the VF display: LOWASH?
Yes
>> Replace the Washer Fluid Level Switch in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 4
KJ
INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS
8J - 85
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