Mil 21 Blinks (Right O2 Sensor) - Honda GL1800 Service Manual

4. Ignition Pulse Generator Peak Voltage
Inspection
Turn the ignition switch to "OFF."
Remove the air cleaner housing (page 5-57).
Disconnect the ignition pulse generator 2P
connector.
Check the connector for loose contacts or cor-
roded terminals.
Turn the ignition switch to "ON."
Crank the engine with the starter motor, and
measure the ignition pulse generator peak volt-
age at the ignition pulse generator connector
terminals.
Connection: Yellow (+) – White/yellow (–)
Standard: 0.7 V minimum
Is voltage at least 0.7 V?
NO – Faulty ignition pulse generator.
YES – • Open or short circuit in the Yellow
wire.
• Open circuit in the White/yellow
wire.
MIL 21 BLINKS (RIGHT O
2
1. Right O Sensor Connection Inspection
2
Remove the top shelter (page 2-12).
Turn the ignition switch to "OFF."
Disconnect the right O
2
Check the connector for loose contacts or cor-
roded terminals.
Connect the right O sensor 4P connector.
2
Place the motorcycle on its side stand.
Start the engine and warm it up until the radiator
fan comes on.
Snap the engine from idle to 5,000 rpm, then let
it idle and check that the MIL blinks.
Is the MIL blinking?
NO – Temporary failure;
normal.
YES – GO TO STEP 2.
2. Right O Sensor Signal Line Short Circuit
2
Inspection
Turn the ignition switch to "OFF."
Disconnect the right O
2
ECM 22P connectors.
Check for continuity between the Black/red wire
terminal of the wire harness side 4P connector
and ground.
Is there continuity?
YES – Short circuit in the Black/red wire.
NO – GO TO STEP 3.
FUEL SYSTEM (Programmed Fuel Injection)
SENSOR)
sensor 4P connector.
the system is
sensor 4P connector and
GN T ON PULSE GENERATOR
CONNECTOR
EAK VOLTAGE ADA TOR
reen/red
Black/red
O SENSOR CONNECTOR
2
5-37