Honda GL1800 Service Manual page 545

BRAKE SYSTEM (ABS)
5. Open Circuit Inspection Between ABS Control
Unit and Indicator
Connect the 5P connector (7). Disconnect the
ABS control unit 5P connector (9). Measure the
voltage between the Yellow/blue terminal (+) of
the connector (9) and ground (–) with the igni-
tion switch turned to "ON." Standard: 1 – 3V.
Is there voltage?
NO
YES (normal voltage) – GO TO STEP 6.
6. Open or Short Circuit Inspection Between ABS
Control Unit and Wheel Speed Sensor
Connect the 5P connector (9). Disconnect the
front and rear wheel speed sensor connectors (1)
and (6). Measure the voltage between each con-
nector (1) and (6), terminal (+) and ground (–) as
shown with the ignition switch turned to "ON."
Is there voltage?
NO
YES
7. Open Circuit Inspection Between ABS Control
and Wheel Speed Sensor
Disconnect the ABS control unit 12P connector
(8). Ground the Green/orange and Blue/yellow
terminals of the connector (8) with jumper wires.
Check for continuity between each connector (1)
and (6) and ground as shown.
Is there continuity?
NO
YES
16-28
– Open circuit in the wire between the
ABS control unit and combination
meter (ABS indicator).
– Open or short circuit in the wire
between the ABS control unit and front
or rear wheel speed sensor.
– GO TO STEP 7.
– Open circuit in the wire between the
ABS control unit and front or rear wheel
speed sensor.
– GO TO STEP 8.
(9)
V
(1)
(6)
V
(8)
(1)
V
(6)