Honda NSS250S Manual page 210

FUEL SYSTEM (PGM-FI)
2. O Sensor Open Circuit Inspection
2
Connect the test harness to the ECM 33P connec-
tor (page 6-17).
Disconnect the O
Check the continuity between the test harness
and O
CONNECTION: 3 – Black/orange
Is there continuity?
YES
NO
3. O Sensor Short Circuit Inspection
2
Check the continuity between the O
connector of the wire side and ground.
CONNECTION: Black/orange – Ground
Is there continuity?
YES
NO
4. O Sensor Inspection
2
Replace the O
new one (page 6-107).
Disconnect the test harness and connect the
ECM 33P (Black) connector.
Turn the ignition switch ON and engine stop
switch " ".
Start the engine and warm it up until the engine
oil temperature is 80°C (176°F).
Test-ride the scooter and recheck the MIL blink-
ing.
Does the MIL blink 21 times?
YES
NO
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sensor 1P (Black) connector.
2
sensor 1P connector of the wire side.
2
– GO TO STEP 3.
– Open circuit in Black/orange wire
– Short circuit in Black/orange wire
– GO TO STEP 4.
sensor and O sensor cord with a
2 2
– Replace the ECM with a known good
one, and recheck.
– Faulty original O sensor and/or O
2
sor cord
TEST HARNESS PIN BOX
sensor 1P
2
O SENSOR 1P CONNECTOR
2
(Wire side/female terminal)
Black/orange
sen-
2
O SENSOR 1P CONNECTOR
2
(Wire side/female terminal)
(3)
Black/orange