Mil 7 Blinks (Ect Sensor) - Honda GL1800 Service Manual

FUEL SYSTEM (Programmed Fuel Injection)
7. MAP Sensor Connection Inspection
Turn the ignition switch to "OFF."
Remove the test harnesses and connect the ECM
connectors.
Place the motorcycle on its side stand.
Start the engine, let it idle and check that the MIL
blinks.
Is the MIL blinking?
NO
YES

MIL 7 BLINKS (ECT SENSOR)

1. ECT Sensor Input Line Voltage Inspection
Remove the left radiator stay (page 5-61).
Turn the ignition switch to "OFF."
Disconnect the ECT sensor 3P connector.
Check the connector for loose contacts or cor-
roded terminals.
Turn the ignition switch to "ON."
Measure the voltage between the wire harness
side 3P connector terminal and ground.
Connection: Yellow/blue (+) – Ground (–)
Standard: 4.75 – 5.25 V
Is the voltage within 4.75 – 5.25 V?
NO
YES
2. ECT Sensor Line Voltage Inspection
Measure the voltage between the wire harness
side 3P connector terminals.
Connection: Yellow/blue (+) – Green/red (–)
Standard: 4.75 – 5.25 V
Is the voltage within 4.75 – 5.25 V?
NO
YES
5-18
– Temporary failure; the
normal.
– Replace the ECM with a new one and
inspect again.
– • Open or short circuit in the Yellow/
blue wire.
• Loose or poorly connected ECM gray
connector or engine sub-wire har-
ness 6P connector.
– GO TO STEP 2.
– • Open circuit in the Green/red wire.
• Loose or poorly connected ECM
black connector or engine sub-wire
harness 6P connector.
– GO TO STEP 3.
system is
CT S NSOR CONN CTOR
Yellow/blue
Green/red