Honda GL1800 Service Manual page 530

6. Speed Sensor Line Short Circuit Inspection at
ABS Control Unit
Disconnect the ABS control unit 12P connector
(8). Check for continuity between the Black/
orange or Blue/yellow terminal of the connector
(8) and ground.
Is there continuity?
NO (NORMAL) – GO TO STEP 8.
YES – GO TO STEP 7.
7. Speed Sensor Line Short Circuit Inspection at
Sensor Connector
Disconnect the rear wheel speed sensor connec-
tor (6). Check for continuity between either ter-
minal of the sensor side connector (6) and
ground in the same manner as the previous
step.
Is there continuity?
NO – Short circuit in the wire between the
ABS control unit and speed sensor.
YES – Faulty rear wheel speed sensor.
8. Wire Harness Continuity Inspection
Disconnect the rear wheel speed sensor connec-
tor (6). Short the terminals of the connector (6)
with a jumper wire. Check for continuity
between the Black/orange and Blue/yellow ter-
minals of the connector (8).
Is there continuity?
NO – Open circuit in the wire between the
ABS control unit and speed sensor.
YES – GO TO STEP 9.
9. Check Indicator Function Again
Remove the rear wheel speed sensor and
replace it with a new one. Connect the control
unit 12P connector (8). Perform the pre-start self-
diagnosis and check the ABS indicator.
Is indicator blinking?
NO – Faulty removed wheel speed sensor.
YES – Faulty ABS control unit.
BRAKE SYSTEM (ABS)
(8)
(6)
(6)
(8)
16-13