Sakai SW300-1, Shop Manual

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10-038
TROUBLESHOOTING
2-6-4. Tachometer reading is abnormal
Reference Fig. : 2-6-1
Check point Check/Cause Action
1. Combination Meter
(Tachometer)
(1) When starter switch is ON, measure voltage between
combination meter terminal wires and ground terminal
wire.
• Battery terminal wire No. 15 inlet wire Y and ground
terminal wire B
• Starter switch terminal wire No. 14 inlet wire BrB and
ground terminal wire B
Standard voltage : 12 V or more
(2) Check that combination meter terminal B wires (rev.
ratio 1 and 2) are grounded.
(3) Start engine and measure pulse between combination
meter rev. pulse input. 2 terminal wire No. 81 inlet wire L
and chassis ground.
Standard pulse : 34 pulses/rotation of engine
• If above items (1) and (2) are OK and pulse is NG in item
(3), tachometer sensor is faulty.
• If above items (1) and (2) are OK and tachometer reading
is NG in item (3), combination meter is faulty.
Replace tachometer
sensor or combination
meter.
2. Harness Connecting
Between Terminals
• Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
• If resistance is abnormal, harness is faulty.
Repair or replace
harness.
2-6-5. Hour meter is abnormal
Reference Fig. : 2-6-1
Check point Check/Cause Action
1. Combination Meter
(Hour meter)
• When starter switch is ON, measure voltage between
combination meter terminal wires and ground terminal
wire.
• Battery terminal wire No. 15 inlet wire Y and ground
terminal wire B
• Starter switch terminal wire No. 14 inlet wire BrB and
ground terminal wire B
Standard voltage : 12 V or more
• If no abnormality is found, combination meter is faulty.
Replace combination
meter.
10̲TROUBLESHOOTING̲oku.indd 10-038 10̲TROUBLESHOOTING̲oku.indd 10-038 2012/11/14 20:25:57 2012/11/14 20:25:57