2007 Liberty KJ Factory Service Manual 8 - ELECTRICAL

*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


No

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


No

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 circuit.

Is the resistance above 5.0 ohms?

Yes


No