1.CHECK COMBINATION METER.
1) Turn the ignition switch to ON (engine OFF).
2) Check other warning lights.
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Does the warning light illuminate?
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Repair or replace the combination meter. 
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2.CHECK THE HARNESS CONNECTOR BETWEEN THE COMBINATION METER AND THE OIL PRESSURE SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from oil pressure switch.
3) Turn the ignition switch to ON.
4) Measure the voltage of harness between oil pressure switch connector and chassis ground.
Connector & terminal
(E11) No. 1 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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Replace the oil pressure switch.
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3.CHECK COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Remove the combination meter.
3) Measure the resistance of combination meter.
Terminals
(i10) No. 9 — (i12) No. 3:
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Is the resistance less than 10 Ω?
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Replace the harness connector between the combination meter and the oil pressure switch.
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Repair or replace the combination meter.
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