Inspect the coolant level signal circuit for an open or short. With a scan tool, view the Coolant Level Switch data in the Engine Data 2 data list.ĭisconnect the coolant level sensor electrical connector.Ĭonnect a 3-amp fused jumper between the coolant level switch signal circuit of the coolant level sensor electrical connector and the ground circuit of the coolant level sensor electrical connector.Ĭonnect a 3-amp fused jumper between the coolant level switch signal circuit of the coolant level sensor electrical connector and a good ground. Turn ON the ignition, with the engine OFF. Verify that the engine coolant is at the proper level. The cluster receives the class 2 message from the PCM indicating Low Coolant and displays the LOW COOLANT LEVEL message on the driver information center (DIC).ĭid you perform the Engine Cooling Diagnostic System Check? Ground is provided by the ground circuits via the body wiring harness junction block and the engine wiring harness junction block. The message center receives its power from engine wiring harness junction block on the battery positive voltage circuit. When the engine coolant level switch reads a low coolant level in the fill tank, the switch opens. The powertrain control module (PCM) sends out a coolant loss signal over the coolant level switch signal circuit. The engine cooling system contains an engine coolant level switch to alert the driver in the event of a coolant loss. The IPC receives a class 2 message from the PCM indicating the coolant level. The IPC illuminates the LOW COOLANT indicator in the message center when the IPC detects a low coolant level condition from the PCM.
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