Oil Pressure Indicator System

The low oil pressure indicator light works in two ways. It will flash continuously following a momentary loss of oil pressure, or it will go on and stay on with a complete loss of oil pressure.

When the engine first starts, before oil pressure rises above 30 kPa (4.3 psi) current flows through the oil pressure indicator light and the oil pressure switch to ground.

With the engine running, voltage is applied to the flasher circuit of the integrated control unit. With normal oil pressure, the engine oil pressure switch is open and the low oil pressure indicator light does not operate. If the oil pressure switch closes momentarily (more than 0.5 second), but then opens again, terminal B13 will sense ground through the switch. The integrated control unit will then provide and remove ground for the oil pressure warning light through terminal B13. The light will flash on and off until the ignition switch is turned to off.

If engine oil pressure falls below 30 kPa (4.3 psi) and does not increase, the engine oil pressure switch will stay closed. The low oil pressure light will go on and stay on.