Indicators

Circuit Description
When the ignition switch is in the ON or START position, battery voltage is applied to the indicator bulb from fuse 28.

Oil Pressure Indicator
When the oil pressure is low (oil pressure switch is closed), ground is provided to the oil pressure indicator bulb. The oil pressure light comes on when the engine is not running and the ignition is ON. In that case, the pressure switch remains closed and the indicator light stays on.

Low Fuel Indicator
The thermister in the fuel gauge sender is near the bottom of the tank. When the fuel level is below the thermister, the resistance of thermister lowers, providing a ground for the indicator.

Check ENGINE Indicator
The ground of the indicator lamp is controlled by the PCM. The control module will light the indicator when the ignition switch is turned ON (system check) or when the ECM detects engine problems.