Honda CBR650F Service Manual page 114

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DTC 21 (O
Probable cause
• Open or short circuit in White/green wire between
the ECM and O
• Open circuit in Green/yellow wire between the O
sensor and ECM
• Faulty O
• Faulty ECM
DTC 21-1 (O
• Before starting the inspection, check for loose or
poor contact on the O
(Black) and 33P (Gray) connectors, and recheck the
DTC.
1. Recheck DTC
Erase the DTC (page 4-7).
Start the engine and warm it up until the coolant
temperature is 80°C (176°F).
Stop the engine.
Check the O
Is the DTC 21-1 indicated?
YES
NO
2. O Sensor Line Open Circuit Inspection
2
Turn the ignition switch OFF.
Disconnect the following:
– O
– ECM 33P (Black)/33P (Gray) connectors (page
4-35)
Check for continuity between the wire harness side
O
2
(Black) [2]/33P (Gray) [3] connector terminals.
TOOL:
Test probe
CONNECTION:
White/green – White/green
Green/yellow – Green/yellow
Is there continuity?
YES
NO
SENSOR)
2
O SENSOR
2
Gr
sensor
2
sensor
2
Sensor)
2
sensor 4P (Black), ECM 33P
2
sensor with the MCS.
2
– GO TO STEP 2.
– Intermittent failure
sensor 4P (Black) connector (page 2-18)
2
sensor 4P (Black) connector [1] and ECM 33P
– GO TO STEP 3.
– Open circuit in White/green or Green/
yellow wire
From main relay
Bl W/G
G/Y
2
[3]
W/G
07ZAJ-RDJA110
PGM-FI SYSTEM
ECM
G/Y
G/Y
[1]
W/G
[2]
4-25