Honda CBF190WH 2016 Shop Manual page 103

ELECTRICAL SYSTEM
DTC 21-1 (O SENSOR)
2
• Fuel tank shroud 3-6
O Sensor Diagram
2
O
2
O sensor
2
1. O Sensor System Inspection
2
• Test-ride the vehicle and check the O
MCS.
• Is the DTC 21-1 is indicated?
Yes ▼
2. O Sensor Circuit Inspection
2
• Check an open or short circuit in Bl/W wire.
• Is there open or short circuit?
No ▼
3. O Sensor Inspection
2
• Replace the O sensor with a new one. 4-20
2
• Erase the DTC's.
• Test-ride the vehicle and check the O
MCS.
• If DTC 21-1 is indicated, replace the ECM with a
new one 4-19, and recheck.
4-14
sensor 2P connector
Bl/W
sensor with
2
sensor with
2
ECM 33P connector
O
2
Bl/W
No • Intermittent failure
► • Loose or poor contact at the connector
Yes
• Faulty Bl/W wire
►
Bl/W
ECM