DTC B1543: Oil Temperature Circuit (Open): Description

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Instrument Panel Cluster (IPC) receives oil temperature information from oil temperature sensor. Oil temperature sensor will produce high resistance when engine oil temperature is low, and low resistance when engine oil temperature is high. IPC supplies a 5-volt reference signal to oil temperature sensor. When engine oil is cold, sensor resistance will decrease, and IPC reference voltage level will drop. IPC checks reference voltage change and displays calculated value on gauge.

DTC B1543 will set when IPC detects oil temperature less than 14°F (-10°C) or IPC detects a high voltage level (open) in oil temperature circuit No. 357 (Dark Green/White wire). This DTC will set only after engine is run for longer than 5 minutes. When DTC B1543 is set, IPC will display oil temperature as LOW. No driver warning message will be displayed.

If conditions for malfunction no longer exist, history DTC will clear after 50 consecutive ignition cycles. DTC B1543 will also clear when conditions no longer exist, or when IPC or scan tool is used to clear codes.