Tachometer Reading Is Abnormal; Hour Meter Is Abnormal - Sakai R2-4 Shop Manual

2-6-10. Tachometer reading is abnormal

Reference Fig.: 2-6-2
Check point
1. Combination Meter
(Tachometer)
2. Harness Connecting
Between Terminals

2-6-11. Hour meter is abnormal

Reference Fig.: 2-6-2
Check point
1. Combination Meter
(Hour meter)
Check/Cause
(1) when starter switch is ON, measure voltage between
combination meter terminal wires and ground terminal
wire.
• Battery (12 V) terminal wire No.73 inlet wire L and
ground terminal wire No.2 wire B
• Starter switch (ACC) terminal wire No.65 inlet wire Y
and ground terminal wire No.2 wire B
Standard voltage : 12 V or more
(2) Check that combination meter rev. ratio SEL.2 terminal
wire No.2 wire B is grounded.
(3) Start engine and measure pulse between combination
meter rev. pulse input • 2 terminal wire No.8 wire Br and
chassis ground.
Standard pulse : 3 pulses/rotation of engine
• If above item is OK and tachometer reading is NG,
combination meter is faulty.
• Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
• If resistance is abnormal, harness is faulty.
Check/Cause
• when starter switch is ON, measure voltage between
combination meter terminal wires and ground terminal
wire.
• Battery (12 V) terminal wire No.73 inlet wire L and
ground terminal wire No.2 wire B
• Starter switch (ACC) terminal wire No.65 inlet wire Y
and ground terminal wire No.2 wire B
Standard voltage : 12 V or more
• If no abnormality is found, combination meter is faulty.
TROUBLESHOOTING
Action
Replace combination
meter.
Repair or replace
harness.
Action
Replace combination
meter.
10-053