Honda CBR650F Service Manual page 115

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PGM-FI SYSTEM
3. O Sensor Output Line Short Circuit Inspection
2
Check the continuity between the wire harness side
O sensor 4P (Black) connector [1] terminal and
2
ground.
CONNECTION: White/green – Ground
Is there continuity?
YES
NO
4. O Sensor Inspection
2
Replace the O
(page 4-39).
Connect the ECM 33P connectors.
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
4-26
– Short circuit in White/green wire
– GO TO STEP 4.
sensor with a known good one
2
sensor with the MCS.
2
– Replace the ECM with a known good one,
and recheck.
– Faulty original O sensor
2
[1]
W/G