Suzuki Boulevard M50, Service Manual

Page: 226 / 454

FI SYSTEM 5-69
“C44” (P0130/P0135) HO2 SENSOR (HO2S) CIRCUIT MALFUNCTION
(FOR E-02, 19, 24)
INSPECTION
Step 1 (When indicating C44/P0130:)
1) Remove the right frame cover. (

8-4)
2) Turn the ignition switch OFF.
3) Check the HO2 sensor for loose or poor contacts.
If OK, then check the HO2 sensor lead wire continuity.
4) Disconnect the HO2 sensor coupler
5) Check the continuity between W/Bl wire
A
and ground.
6) Also, check the continuity between W/Bl wire
A
and B/Br wire
B
. If the sound is not heard from the tester, the circuit condi-
tion is OK.

09900-25008: Multi-circuit tester set

Tester knob indication: Continuity test (

)
DETECTED CONDITION POSSIBLE CAUSE
C44
(P0130) HO2 sensor output voltage is not input
to ECM during engine operation and
running condition.
(Sensor voltage
0.1 V)
• HO2 sensor circuit open or shorted to ground
• Fuel system malfunction
• ECM malfunction
C44
(P0135) The heater can not operate so that
heater operation voltage is not supply to
the oxygen heater circuit. • Battery voltage supply to the HO2 sensor
ECM
Side-stand
relay
Ignition
switch
Engine stop
switch
O/W
W
Gr
B
W
B/Br
W/Bl
W/B
HO2 sensor
HO2S
HO2. H
E2
To GP
switch
1
1
]
SA
MP
LE