Honda CB 600F Hornet 2007 Shop Manual page 157

MIL 21 BLINKS (02 SENSOR)
• Before starting the inspection, check for loose or
poor contact on the 02 sensor 4P {Black) connec­
tor and ECM 33P connectors. then recheck the
MIL blinking.
1. O, 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.
fs the MfL 21 blinks?
YES - GO TO STEP 2.
NO - Intermittent failure
2. O, Sensor Open Circuit Inspection
Turn the ignition switch OFF.
Connect the ECM test harness to the ECM con­
nectors {page 5-14).
Disconnect the 02 sensor 4P {Black) connector.
Check the continuity between the test harness
terminals and the 02 sensor connector terminals
of the wire harness side.
CONNECTION: B20 - Orange/white
A 18 - Green/orange
Are there continuities?
YES - GO TO STEP 3.
NO - • Open circuit in Orange/white wire
• Open circuit in Green/orange wire
3. 02 Sensor Short Circuit Inspection
Connect the 02 Sensor 4P (Black) connector.
Check for continuity between the test harness
terminal and ground.
CONNECTION: 820 - Ground
Is there continuity?
YES
- Short circuit in the Orange/white wire
NO - GO TO STEP 4.
4. 02 Sensor Inspection
Replace the 02 sensor with a known good one
(page 5-100).
Start the engine and warm it up until the coolant
•c
temperature is 80 (176 °F).
Test-ride the motorcycle and recheck the MIL
blinking.
Is the MIL 21 blinks?
YES - Replace the ECM with
one, and recheck; refer to Key Registra­
tion Procedures {page 21-6)
NO - Faulty original O, sensor
a
known good
FUEL SYSTEM (PGM-FI)
4P (Black) CONNECTOR
(Wire side/male terminals)
Green/ Orange/
orange white
(820)
TEST HARNESS PIN BOX
(8 TERMINALS)
5-47