Honda NSS250S Manual page 211

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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
Brown/red – Ground
Black/red – Ground
Gray/red – Ground
Is there continuity?
YES – Short circuit in Light green/red, Brown/
red, Black/red, or Gray/red wire
NO – GO TO STEP 2.
2. IACV Open Circuit Inspection
Connect the test harness to ECM 33P connector.
Check the continuity between the test harness
and IACV 4P connector of the wire side.
CONNECTION: 20 – Brown/red
32 – Gray/red
21 – Light green/red
31 – Black/red
Is there continuity?
YES – GO TO STEP 3.
NO – Short circuit in Brown/red, Gray/red,
Light green/red, or Black/red wire
3. IACV Resistance Inspection
Disconnect the test harness of the ECM 33P
(Black) connector side.
Connect the IACV 4P (Black) connector.
Measure the resistance at the test harness termi-
nals.
CONNECTION: 21 – 32
20 – 31
110 – 150 Ω (25°C/77°F)
STANDARD:
Is the resistance within 110 – 150 Ω (25 ° C/77 ° F)?
YES – Replace the ECM with a known good
one, and recheck.
NO – Faulty IACV
FUEL SYSTEM (PGM-FI)
IACV 4P CONNECTOR
(Wire side/female terminals)
Light
green/red
Brown
/red
TEST HARNESS PIN BOX
Brown/red
(20) (21)
Light
green/red
(31)
(32)
IACV 4P CONNECTOR
(Wire side/female terminals)
TEST HARNESS PIN BOX
(21)
(20)
Gray/red
Black
/red
Black/red
Gray
/red
(32)
(31)
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