Diagnostic Troubleshooting Flow Chart - Honda GL1800 Service Manual

DIAGNOSTIC TROUBLESHOOTING FLOW CHART

Be careful not to damage the wheel speed sensor and pulser ring when servicing.
• The connector number (number in parenthesis) indicates the connector location as shown on page 16-4. All connector
diagrams in the flow charts are viewed from the terminal side.
• Perform inspection with the ignition switch turned to "OFF," unless otherwise specified.
• Use a fully charged battery. Do not diagnose with a charger connected to the battery.
• When the ABS control unit or modulator is detected to be faulty, recheck the wire harness and connector connections
closely before replacing it.
• After troubleshooting, erase the problem code and perform the pre-start self-diagnosis to be sure that the ABS indicator
is operating normally.
• The ABS indicator might blink in the following cases. Correct the faulty part.
– Incorrect tire pressure.
– Tires not recommended for the motorcycle were installed (incorrect tire size).
– Deformation of the wheel or tire.
• The ABS indicator might blink while riding under the following conditions. Erase the problem code and perform the pre-
start self-diagnosis. The ABS is normal if the indicator goes off. Ask the rider for the riding conditions in detail when the
motorcycle is brought in for inspection.
– The motorcycle has continuously run on bumpy roads.
– After riding (after the pre-start self-diagnosis), the engine was kept running and the rear wheel turning (for more than
30 seconds) with the motorcycle placed on the center stand.
• If the pulser ring or speed sensor is replaced, perform the air gap inspection page 16-29.
BRAKE SYSTEM (ABS)
16-9