Page 134 - 2019 SHOP MANUAL CRF1000/A/D

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PGM-FI SYSTEM
3. O2 Sensor Output Line Short Circuit Inspection
Check for continuity between the wire harness side
4P (Black) connector [1] and ground. [1]
Connection: Black – Ground
Is there continuity?
YES – Short circuit in the Black wire
NO – GO TO STEP 4.
Bl

4. O2 Sensor Ground Line Open Circuit Inspection
Disconnect the ECM/PCM 33P (Black) connector
(page 4-39). [1] [2]
Check for continuity between the wire harness side
4P (Black) connector [1] and 33P (Black) connector
[2].
TOOL:
Test probe 07ZAJ-RDJA110

Connection: Gray – B13 Gr
B13
Is there continuity?
YES – GO TO STEP 5.
NO – Open circuit in the Gray or Gray/black wire

5. O2 Sensor Inspection
Replace the O2 sensor with a known good one
(page 4-42).
Connect the ECM/PCM 33P (Black and Gray)
connectors.
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 O2 sensor with the MCS.
Is the DTC 21-1 indicated?
YES – Replace the ECM/PCM with a known good
one (page 4-39) and recheck.
NO – Faulty original O2 sensor

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