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*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 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 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 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 - CONTROL MODULES - STANDARD PROCEDURE) No >> Go To 3 8J - 82 INSTRUMENT CLUSTER - ELECTRICAL DIAGNOSTICS KJ |