Dtc 21 (O2 Sensor) - Honda CRF1000 Shop Manual

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DTC 21 (O
Probable cause
• Open or short circuit in the Black wire between the
ECM/PCM and O
• Open circuit in the Gray or Gray/black wire between
the O
• Faulty O
• Faulty ECM/PCM
DTC 21-1 (O
• Before starting the inspection, check for loose or
poor contact on the O
33P (Black) and 33P (Gray) connectors, and
recheck the DTC.
1. Recheck DTC
Erase the DTC (page 4-6).
Start the engine and warm it up until the coolant
temperature is 80°C (176°F).
Stop the engine.
Check the DTC with the MCS.
Is the DTC 21-1 indicated?
YES
NO
2. O Sensor Output Line Open Circuit Inspection
2
Turn the ignition switch OFF.
Disconnect the O
(page 2-17).
Disconnect the ECM/PCM 33P (Gray) connector
(page 4-39).
Check for continuity between the wire harness side
4P (Black) connector [1] and 33P (Gray) connector
[2].
TOOL:
Test probe
Connection: Black – C19
Is there continuity?
YES
NO
SENSOR)
2
O SENSOR
2
Bl
Gr
sensor
2
sensor and ECM/PCM
2
sensor
2
Sensor)
2
sensor 4P (Black), ECM/PCM
2
– GO TO STEP 2.
– Intermittent failure
sensor 4P (Black) connector
2
07ZAJ-RDJA110
– GO TO STEP 3.
– Open circuit in the Black wire
Bl
Gr Gr/Bl
[1]
Bl
PGM-FI SYSTEM
ECM/PCM
[2]
C19
4-25