FUEL SYSTEM (PGM-FI)
5-47
MIL 21 BLINKS (O
2
SENSOR)
• Before starting the inspection, check for loose or
poor contact on the O
2
sensor 4P (Black) connec-
tor and ECM 33P connectors, then recheck the
MIL blinking.
1. O
2
Sensor System Inspection
Start the engine and warm it up to coolant tem-
perature is 80
°
C (176
°
F).
Test-ride the motorcycle and recheck the MIL
blinking.
Is the MIL 21 blinks?
YES
–
GO TO STEP 2.
NO
–
Intermittent failure
2. O
2
Sensor Open Circuit Inspection
Turn the ignition switch OFF.
Connect the ECM test harness to the ECM con-
nectors (page 5-14).
Disconnect the O
2
sensor 4P (Black) connector.
Check the continuity between the test harness
terminals and the O
2
sensor connector terminals
of the wire harness side.
Are there continuities?
YES
–
GO TO STEP 3.
NO
–
• Open circuit in Orange/white wire
• Open circuit in Green/orange wire
3. O
2
Sensor Short Circuit Inspection
Connect the O
2
Sensor 4P (Black) connector.
Check for continuity between the test harness
terminal and ground.
Is there continuity?
YES
–
Short circuit in the Orange/white wire
NO
–
GO TO STEP 4.
4. O
2
Sensor Inspection
Replace the O
2
sensor with a known good one
(page 5-101).
Start the engine and warm it up until the coolant
temperature is 80
°
C (176
°
F).
Test-ride the motorcycle and recheck the MIL
blinking.
Is the MIL 21 blinks?
YES
–
Replace the ECM with a known good
one, and recheck; refer to Key Registra-
tion Procedures (page 21-6)
NO
–
Faulty original O
2
sensor
CONNECTION: B20 – Orange/white
A18 – Green/orange
TEST HARNESS
PIN BOX
(A TERMINALS)
TEST HARNESS
PIN BOX
(B TERMINALS)
Green/
orange
Orange/
white
4P (Black) CONNECTOR
(Wire side/male terminals)
(A18)
(B20)
CONNECTION: B20 – Ground
TEST HARNESS PIN BOX
(B TERMINALS)
(B20)
Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys.
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