Problem Code 3 And 9: Rear Wheel Speed Sensor System And Abs Control Unit - Honda GL1800 Service Manual

BRAKE SYSTEM (ABS)
Problem Code 3 and 9: Rear wheel speed sensor
system and ABS control unit
1. Wheel Pulser Air Gap Inspection
Check the area around the rear wheel speed
sensor.
Measure the air gap between the speed sensor
and pulser ring (page 16-29).
Is the air gap correct?
NO
YES
2. Wheel Pulser Magnetic Deposits Inspection
Check between pulser ring and speed sensor for
any iron or other magnetic deposits.
Magnetic deposits found?
NO
YES
3. Speed Sensor/Pulser Ring Fit Inspection
Check installation condition of the pulser ring
and speed sensor for looseness.
Did pulser ring and speed sensor have proper
fit?
NO
YES
4. Speed Sensor/Pulser Ring Damage Inspection
Check the pulser ring for deformation or damage
(e.g., chipped teeth) and the speed sensor tip for
damage.
Was deformation or damage found?
NO
YES
5. ABS Indicator Function Inspection
Retrieve the problem code and erase it. With the
ignition switch turned "ON" (do not operate the
ignition switch after erasing the problem code),
turn the rear wheel by hand (vehicle speed:
approximately 4 km/h [2.5 mph] or above) and
check the ABS indicator.
Is the indicator blinking?
YES
NO
16-12
– Check each part for deformation and
looseness and correct
Check for air gap again.
– GO TO STEP 2.
– GO TO STEP 3.
– Remove any deposits.
– Install properly or replace the faulty
part.
– GO TO STEP 4.
– GO TO STEP 5.
– Replace the faulty part.
– Normal (temporary failure).
The ABS control unit has been dis-
rupted by an extremely powerful radio
wave. Check the connector and wire
harness of the speed sensor system for
loose connection.
– GO TO STEP 6.
accordingly.