Honda GL1800 Service Manual page 178

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6. IAC Valve Harness Short Circuit Inspection
Check continuity between the following wire ter-
minal and ground at the wire harness side IAC
valve 3P connector.
• Black/yellow
• Green
• Light blue
Is there continuity?
YES
– Short circuit in the following wires of
the engine sub-wire harness:
– Black/yellow
– Green
– Light blue
NO
– GO TO STEP 7.
7. IAC Valve Signal Voltage at ECM Inspection
Connect the IAC valve 3P connector and the
engine sub-wire harness 8P connector.
Install the fuel tank (page 5-56).
Turn the ignition switch to "ON."
Measure the voltage between the ECM 22P black
connector terminal and ground.
Connection: Light blue (+) – Ground (–)
Standard: Battery voltage
Does battery voltage exist?
NO
– Faulty IAC valve.
YES
– GO TO STEP 8.
8. IAC Valve Connection Inspection
Turn the ignition switch to "OFF."
Connect the ECM 22P black connector.
Place the motorcycle on its side stand.
Start the engine, let it idle and check that the MIL
blinks.
Is the MIL blinking?
NO
– Temporary
failure;
normal.
YES
– Replace the ECM with a new one and
inspect again.
FUEL SYSTEM (Programmed Fuel Injection)
the
system
is
ECM 22P B ACK CONNECTOR
(viewed from the terminal side)
ight blue
5-47

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