Honda NSS250S Manual page 219

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MIL 21 BLINKS (O SENSOR)
2
Do not reuse O sensor cord, if the O
2
disconnected, replace the O
one.
• Before starting the inspection, check for loose or
poor contact on the O sensor 1P (Black) connec-
2
tor and recheck the MIL blinking.
1. O Sensor System Inspection
2
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 – GO TO STEP 2.
NO – Intermittent failure
2. O Sensor Open Circuit Inspection
2
Connect the test harness to the PCM 33P connec-
tor (page 6-17).
Disconnect the O sensor 1P (Black) connector.
2
Check the continuity between the test harness
and O sensor 1P connector of the wire side.
2
CONNECTION: 18 – Black/orange
Is there continuity?
YES – GO TO STEP 3.
NO – Open circuit in Black/orange wire
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 – Short circuit in Black/orange wire
NO – GO TO STEP 4.
sensor cap is
2
sensor cord with a new
2
TEST HARNESS PIN BOX
sensor 1P
2
O
(Wire side/female terminal)
FUEL SYSTEM (PGM-FI)
O SENSOR 1P CONNECTOR
2
(Wire side/female terminal)
(18)
SENSOR 1P CONNECTOR
2
Black/orange
Black/orange
6-65