Sakai SV400D-2, Shop Manual

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9-029
ELECTRICAL SYSTEM TROUBLESHOOTING
2-5. Lighting and Accessories
Check the following items before troubleshooting.
No fuse blew.
2-5-1. Combination meter monitor lamps do not light
Reference Fig. : 2-5
Check point Check/Cause Action
1. Each Bulb - Check that none of the combination meter bulbs is burned out
or has a contact failure (oil pressure warning lamp, hydraulic
oil filter warning lamp, parking brake indicator lamp, vibrator
operation indicator lamp and battery charge lamp).
- Bulb is faulty or poorly connected.
Replace each bulb.
2. Lamp Check Relay (1) When turning starter switch ON, measure voltage between
lamp check relay pin 1 inlet LgW wire and chassis ground.
Standard voltage: 12 V or more
(2) When turning starter switch ON, measure voltage between
lamp check relay pin 3 inlet BY wire and chassis ground.
Standard voltage: 12 V or more
(3) When turning starter switch ON, measure voltage between
lamp check relay pin 5 and chassis ground.
Standard voltage: 12 V or more
- If the warning lamp does not light when above items (1) and (2)
are OK and item (3) is NG, the lamp check relay is faulty.
Replace the lamp
check relay.
3. Harness Connecting
Between Terminals
- Check harness between terminals for continuity.
- No continuity indicates that harness is open or poorly
connected.
Repair or replace the
harness.
2-5-2. Tachometer reading is abnormal
The other lamps light correctly.
Reference Fig. : 2-5
Check point Check/Cause Action
1. Tachometer Sensor
- Start the engine and fix the engine speed at 1000 rpm.
Connect a digital multimeter between the tachometer sensor
pin YG wire and ground wire and measure the pulse count for
1 minute.
Standard pulse count: 2,000
- If the standard pulse count is abnormal, the tachometer sensor
is faulty.
Replace the
tachometer sensor.
2. Tachometer - When turning starter switch ON, measure voltage between
tachometer plus (+) terminal YG wire and chassis ground.
Standard voltage: 12 V or more
- If the above is OK, and there is no problem with the
tachometer sensor, then the tachometer is faulty.
Replace the
combination meter.
3. Harness Connecting
Between Terminals
- Check harness between terminals for continuity.
- No continuity indicates that harness is open or poorly
connected.
Repair or replace the
harness.
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