7-54
E
–
+
ELEC
INDICATION SYSTEM
Speedometer display
1. Check:
• Speedometer display
Does not display
→
Measure the speed
sensor output voltage and pulses.
2. Measure:
• Speed sensor output voltage and pulses
Out of specification
→
Repair or
replace.
Within specification
→
Replace the mul-
tifunction meter.
Speed sensor output voltage
(dependant on the paddle wheel
position):
Less than 400 mV/
More than 11.6 V
Output pulse:
2 pulses/one-full turn
Measurement steps:
• Apply DC 12 volts to the natural color
three-pin connector (between the red/yel-
low and black/yellow leads).
• Rotate the paddle wheel by hand and
measure the voltage between the black/
yellow and yellow leads.
NOTE:
As the paddle wheel is rotated, a square-
wave voltage signal
a
is produced.
• Two pulses occur every time the paddle
wheel makes one-full turn.
