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Cruise Control
Troubleshooting
(cont'd) - - - - - - - - - - - - - - - - - - - -
~
No,mal
POWER TO INSTRUMENT SPEED
SENSOR: Does battery voltage appear
between BuiY
I
+)
and
G I -)
terminals of
ECU coupler with ignition switch ON?
Battery
Voltage
SPEED SENSOR: With ignition switch ON
and cruise switch ON. measure voltage
between BIN
(+)
and G (- J terminals of
ECU coupler
r=~---------I-Bl,Y
(+1
DDD00[J[;J.OD
DODD DDDDD
GI-)
1.9'"
Voltage should change from about 9V to
less than 1 V alternately when front wheel
IS
rotated slowly.
Normal
HOSES: Check vacuum hoses for damage
or clogging.
Normal
o
Volts
•
Open Circuit In wire harness.
Abnormal
I
I
t---~";"";';;~~I
Check speed sensor (see base manual).
~
Abnormal
t
Normal
•
Faulty speed
•
Short or open cir-
sensor.
cui! in wire
harness.
•
Poor contact at
coupler.
Abnormal
•
Faulty vaquum circuit.
ACTUATOR: Check actuator
(see page 13-13).
Normal
CONTROL VALVE: Check cruise control
valve unit (see page 13·15).
Normal
13-8
Abnormal
Abnormal
•
Faulty actuator or cable.
•
Faulty cruise control valve unit.
•
Try with a known good ECU.
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