Honda CBR125R, Owner'S Manual

Page: 133 / 430

FUEL SYSTEM (PGM-FI)
5-41
4. O
2
Sensor Inspection
Replace the O
2
sensor and O
2
sensor cord with a
known good one (page 5-67).
Disconnect the ECM test harness and connect
the ECM 33P connector.
Turn the ignition switch ON (and engine stop
switch " ": CM and U type).
Start the engine and warm up the engine up to
coolant temperature is 80
°
C (176
°
F).
Test-ride the motorcycle and recheck the MIL
blinking.
Does the MIL blink 21 times?
YES – Replace the ECM with a known good
one, and recheck.
NO – Faulty original O
2
sensor and/or O
2
sen-
sor cord
MIL 29 BLINKS (IACV)
• Before starting the inspection, check for loose or
poor contact on the IACV 4P connector and
recheck the MIL blinking.
1. IACV Resistance Inspection
Turn the ignition switch OFF.
Disconnect the IACV 4P connector.
Measure the resistance at the IACV 4P connector
terminals.
Is the resistance within 110 – 150
Ω
(25
°
C/77
°
F)?
YES – GO TO STEP 2.
NO – Faulty IACV
2. IACV Short Circuit Inspection
Check for continuities between the IACV 4P con-
nector of the wire side and ground.
Is there continuity?
YES – • Short circuit in Blue/black or Pink/
black wire
• Short circuit in Brown/yellow or
Blue/red wire
NO – GO TO STEP 3.
Connection: Blue/black – Blue/red
Pink/black – Brown/yellow
Standard: 110 – 150
Ω
(25
°
C/77
°
F)
IACV 4P CONNECTOR
(IACV side/male terminals)
Bu/R Bu/Bl
P/Bl Br/Y
Connection: Blue/black – Ground
Pink/black – Ground
Brown/yellow – Ground
Blue/red – Ground
Bu/R Bu/Bl
IACV 4P CONNECTOR
(Wire side/female terminals)
P/Bl
Br/Y