9-079
TROUBLESHOOTING
2-7-7. Engine oil pressure warning lamp remains ON
Check whether engine check lamps show no fault code.
Reference Fig. : 2-7-1
Check point
Check/Cause
Action
1. Harness
Disconnect connectors between engine ECM, engine oil
pressure switch relay (B-4) and combination meter.
Measure resistance between terminals and chassis
ground.
Engine ECM output return (-) terminal 13 wire GB and
chassis ground.
Engine oil pressure switch relay (B-4) terminal 2 wire
GB and chassis ground.
Engine ECM dual output A (+) for oil pressure terminal
14 wire RB and chassis ground.
Engine oil pressure switch relay (B-4) terminal 1 wire
RB and chassis ground.
Combination meter connector terminal wire No. 8 wire
YL and chassis ground.
Engine oil pressure switch relay (B-4) terminal 4 wire
YL 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.
•
•
•
•
•
•
•
•
•
•
Repair or replace
harness.
2. Engine Oil Pressure
Switch
Relay (B-4)
(1) when starter switch is ON, measure voltage between
engine oil pressure switch
relay (B-4) terminal 1 inlet
wire RB and chassis ground.
There is no electricity in normal condition.
(2) when starter switch is ON, measure voltage between
engine oil pressure switch
relay (B-4) terminal 3 outlet
wire B and chassis ground.
There is no electricity in normal condition.
If above item (1) is OK and item (2) is NG, engine oil
pressure switch relay
(B-4)
is faulty.
•
Replace engine oil
pressure switch relay
(B-4).
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. 70 inlet wire WR and
ground terminal wire B.
Starter switch terminal inlet wire No. 35 inlet wire YW
and ground terminal wire B.
Standard voltage : 24 V or more
(2) when starter switch is ON, measure voltage between
combination meter engine oil pressure warning terminal
outlet wire No. 8 wire YL 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.
•
•
•
Replace combination
meter.
•
Summary of Contents for SV540 Series
Page 1: ...SV540 SHOP MANUAL 3498 6418A 0 ...
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Page 13: ...SAFETY ...
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Page 22: ......
Page 23: ...SPECIFICATIONS ...
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Page 42: ......
Page 43: ...ENGINE AND CONTROLS ...
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Page 53: ...HYDRAULIC SYSTEMS ...
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Page 85: ...ELECTRICAL SYSTEM ...
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Page 119: ...VIBRATORY DRUM REAR AXLE ...
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Page 169: ...BRAKE ...
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Page 179: ...INSPECTION AND ADJUSTMENT ...
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Page 207: ...TROUBLESHOOTING ...
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