Low Coolant Level Indicator Diagnosis for Generic Unit Repair 1999

Refer to Engine Controls Schematics

The engine coolant level switch is located in the radiator surge tank. The engine coolant level switch is a float type switch. The PCM supplies a voltage to the engine coolant level switch. The engine coolant level switch is a normally open switch. When the coolant level is within an acceptable range the engine coolant level switch closes. The switch opens when the engine coolant level drops below a predetermined amount. When the PCM detects a high signal voltage (switch open) from the engine coolant level switch the PCM sends a class 2 message to the instrument panel cluster (IPC). The IPC displays Low Engine Coolant on the Message Center.

1. DTCs P0500, P0502 and P0503 not set.
2. The engine coolant is greater than 22° C (70° F).
3. The message will latch for the complete ignition cycle.