Acura Integra 1998 Service Manual page 1216

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Engine Oil Pressure
Indicator System
Description
NOTE: Refer to page 23-152 for the circuit diagram of
the engine oil pressure indicator flasher. and to page 23
156 for the input test of the flasher circuit.
The low engine oil pressure indicator light works in two
ways. lt will flash continuously following a momentary
loss ol oil pressure, or it will go on and stay on wath a
complete loss of oil pressure.
When the engine first starts, before oil pressure rises
above 29.4 kPa (O.3 kgf/cmr, 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 Ilash-
er circuit of the integrated control unit. With normal oil
pressure, the oil pressure switch is open and the low en-
gine oil pressure indicator light does not operate. lf the
oil pressure switch closes momentarily (more than O.5
seconds). but then opens again, terminal "YEL/RED" will
sense ground through the switch- The integrated con-
trol unit will then provide and remove ground tor the low
engine oil pressure indicator light through terminal
" Y E L / R E D " .
T h e l i g h t w i l l f l a s h o n a n d o f f u n t i l t h e i g n i
tion switch is turned to "OFF".
lf engine oil pressure talls below 29.4 kPa (O.3 kgf/cmr,
4.3 psi) and does not increase, the oil pressure switch
will stay closed. The low engine oil pressure indicator light
w i l l g o o n a n d s t a y o n .
NOTE: Refer to page 23-130 for the engine oil pressure
switch test.
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