Honda NSS250S Manual page 220

FUEL SYSTEM (PGM-FI)
4. O Sensor Inspection
2
Replace the O
known good one (page 6-107).
Disconnect the test harness and connect the
PCM 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
MIL 29 BLINKS (IACV)
• Before starting the inspection, check for loose or
poor contact on the IACV 4P (Black) connector
and recheck the MIL blinking.
1. IACV Short Circuit Inspection
Turn the ignition switch OFF.
Check the continuity between the IACV 4P con-
nector of the wire side and ground.
CONNECTION: Light green/red – Ground
Is there continuity?
YES
NO
2. IACV Open Circuit Inspection
Connect the test harness to PCM 33P connector.
check the continuity between the test harness
and IACV 4P connector of the wire side.
CONNECTION: 12 – Brown/red
Is there continuity?
YES
NO
6-66
maxiscooter-club.ru
sensor and O sensor cord with a
2 2
– Replace the PCM with a known good
one, and recheck.
– Faulty original O sensor and/or O
2
sor cord
Brown/red – Ground
Black/red – Ground
Gray/red – Ground
– Short circuit in Light green/red, Brown/
red, Black/red, or Gray/red wire
– GO TO STEP 2.
13 – Gray/red
14 – Light green/red
15 – Black/red
– GO TO STEP 3.
– Short circuit in Brown/red, Gray/red,
Light green/red, or Black/red wire
sen-
2
IACV 4P CONNECTOR
(Wire side/female terminals)
Light
green/red
Brown
/red
TEST HARNESS PIN BOX
(12)
(14)
(15)
(13)
Gray/red
Black
/red
Brown/red
Light
green/red
Black/red
Gray/red
IACV 4P CONNECTOR
(Wire side/female terminals)