Integra LS Coupe L4-1834cc 1.8L DOHC MFI (1997)
Engine Oil Pressure Light: Description and Operation
OIL PRESSURE INDICATOR SYSTEM
The low engine 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 29.4 kPa (0.3 kgf/Sq.cm, 4.3 psi), current flows through the low engine oil pressure
indicator light and the oil pressure switch to ground. This tests the circuit.
With the engine running, voltage is applied to the flasher circuit of the integrated control unit. With normal oil pressure, the oil pressure switch is open
and the low engine oil pressure indicator light does not operate. If the oil pressure switch closes momentarily (more than 0.5 seconds), but then opens
again, terminal "YEL/RED" will sense ground through the switch. The integrated control unit will then provide and remove ground for the low engine oil
pressure indicator light through terminal "YEL/RED". The light will flash ON and OFF until the ignition switch is turned to "OFF".
If engine oil pressure falls below 29.4 kPa (0.3 kgf/Sq.cm, 4.3 psi) and does not increase, the oil pressure switch will stay closed. The low engine oil
pressure indicator light will go on and stay on.
