Sakai SW880-1, Shop Manual

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11-195
TROUBLESHOOTING
2-9-8. Engine oil pressure warning lamp remains ON
Check whether engine check lamps show no fault code.
Reference Fig. : 2-9-1
Check point Check/Cause Action
1. Harness Disconnect connectors between engine ECM, engine oil
pressure switch relay and combination meter.
Measure resistance between terminals and chassis
ground.
Engine ECM terminal 13 wire Gw and chassis ground.
Engine oil pressure switch relay terminal 2 wire GW
and chassis ground.
Engine ECM for oil pressure terminal 14 wire Lw and
chassis ground.
Engine oil pressure switch relay terminal 1 wire LW and
chassis ground.
Combination meter connector terminal wire No. 22 wire
Lg and chassis ground.
Engine oil pressure switch relay terminal 3 wire Lg and
chassis ground.
Standard resistance : 100 kΩ or more
If resistance is abnormal, harness is faulty.
(NOTICE)
If any abnormality is found in shielded twisted wires,
repair is not approved. Be sure to replace them.
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Repair or replace
harness.
2. Engine Oil Pressure
Switch Relay
(1) when starter switch is ON, measure voltage between
engine oil pressure switch relay terminal 1 inlet wire LW
and chassis ground.
There is no electricity in normal condition.
(2) when starter switch is ON, check continuity between
engine oil pressure switch relay terminal 3 and terminal 5.
There is no continuity in normal condition.
If above item (1) is OK and item (2) is NG, engine oil
pressure switch relay is faulty.
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Replace engine oil
pressure switch relay.
3. Combination Meter
(Engine oil pressure
warning indicator lamp)
(1) when starter switch is ON, measure voltage between
combination meter terminal wires and ground terminal
wire.
Battery terminal inlet wire No. 155 inlet wire R and
ground terminal wire B.
Starter switch terminal inlet wire No. 64 inlet wire LgW
and ground terminal wire B.
Standard voltage : 12 V or more
(2) when starter switch is ON, measure voltage between
combination meter engine oil pressure warning terminal
wire No. 22 outlet wire Lg (engine oil pressure warning
terminal) and chassis ground.
There is no electricity in normal condition.
If above items (1) and (2) are OK and no fault code is
shown but engine oil pressure warning lamp remains on
after starting engine, combination meter is faulty.
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Replace combination
meter.
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