Sakai SW880-1, Shop Manual

Page: 399 / 428

11-189
TROUBLESHOOTING
2-9-3. Tachometer reading is abnormal
Reference Fig. : 2-9-1
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. 155 inlet wire R and ground
terminal wire B
Starter switch terminal wire No. 64 inlet wire LgW and
ground terminal wire B
Standard voltage : 12 V or more
(2) Check that combination meter terminal wire B (rev. ratio
1, 2 and 3) are grounded.
(3) Start engine and measure pulse between combination
meter rev. pulse input. 1 terminal wire No. 20 inlet wire
GW and chassis ground.
Standard pulse : 127 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.
2-9-4. Hour meter is abnormal
Reference Fig. : 2-9-1
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. 155 inlet wire R and ground
terminal wire B
Starter switch terminal wire No. 64 inlet wire LgW and
ground terminal wire B
Standard voltage : 12 V or more
If no abnormality is found, combination meter is faulty.
•
•
•
•
Replace combination
meter.