TSRM/MK4 Supra/Repair Manual
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BE/Body Electrical Systems — Low Oil Pressure Warning Inspection, page 51

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Low Oil Pressure Warning Inspection — MK4 Supra Body Electrical Systems, page 51
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Page text (OCR transcript)
BODY ELECTRICAL SYSTEM – COMBINATION METER

BE–51

LOW OIL PRESSURE WARNING INSPECTION

1. INSPECT SWITCH
(a) Check that there is continuity between terminal and ground with the engine stopped.
(b) Check that there is no continuity between terminal and ground with the engine running.
HINT: Oil pressure should be over 29 kPa (0.3 kgf/ cm2, 4.3 psi)
If operation is not as specified, replace the switch.

2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
(b) Turn the ignition switch ON, check that the warning light lights up.
If the warning light does not light up, test the bulb or inspect wire harness.

Warning Light
Ignition Switch
Battery

ENGINE OIL LEVEL WARNING INSPECTION

1. INSPECT SWITCH
(a) Check that there is continuity between terminal with the switch in each position.

ON
OFF

(b) Heat the switch to above 60°C (140°F) in an oil bath.
(c) Check that there is continuity between terminals with the switch ON (float up).
(d) Check that there is no continuity between terminals with the switch OFF (float down).
If operation is not as specified, replace the switch.

2. INSPECT WARNING LIGHT
(a) Disconnect the connector from the switch.
(b) Ground terminal 1 on the wire harness connector.
(c) Turn the ignition switch ON. Check that the warning light lights up approximately 40 seconds later.
If the warning light does not light up, inspect bulb or wire harness.

Warning Light
Ignition Switch
Battery

N09640
BE0044
N09645
N09646
IS-2-1-D BE0044
207431