Mil 26 Blinks (Left Knock Sensor) - Honda GL1800 Service Manual

FUEL SYSTEM (Programmed Fuel Injection)
2. Right Knock Sensor Line Short Circuit
Inspection
Turn the ignition switch to "OFF."
Disconnect the right knock sensor 1P connector
and ECM 22P gray connector.
Check for continuity between the wire harness
side knock sensor 1P connector terminal and
ground.
Is there continuity?
YES
NO
3. Right Knock Sensor Line Continuity Inspection
Check for continuity between the Red/blue wire
terminals of the wire harness side knock sensor
connector and ECM 22P gray connector.
Is there continuity?
NO
YES
4. Right Knock Sensor Operation Inspection
Replace the knock sensor with a new one (page
5-69).
Place the motorcycle on its side stand.
Start the engine and hold the engine speed
above 2,500 rpm for 10 seconds or more.
Check that the MIL blinks.
Is the MIL blinking?
NO
YES

MIL 26 BLINKS (LEFT KNOCK SENSOR)

1. Left Knock Sensor Connection Inspection
Remove the left front exhaust pipe protector
(page 2-18).
Turn the ignition switch to "OFF."
Disconnect the left knock sensor 1P connector.
Check the connector for loose contacts or cor-
roded terminal.
Connect the left knock sensor 1P connector.
Place the motorcycle on its side stand.
Start the engine and hold the engine speed
above 2,500 rpm for 10 seconds or more.
Check that the MIL blinks.
Is the MIL blinking?
NO
YES
5-44
– Short circuit in the Red/blue wire.
– GO TO STEP 3.
– Open circuit in Red/blue wire.
– GO TO STEP 4.
– Original knock sensor is faulty.
– Replace the ECM with a new one and
inspect again.
– Temporary failure; the
normal.
– GO TO STEP 2.
Red/blue
CM 22P GRAY CONN CTOR
(viewed from the terminal side)
system is
NOC SENSOR CONNECTOR