Suzuki Boulevard M50, Service Manual, Page: 227 / 454

5-70 FI SYSTEM
7) Remove the right frame cover. (

8-4)
8) Remove the ECM bracket (

5-38) and disconnect the
ECM coupler.
9) Check the continuity between W/Bl wire
A
and terminal
7
.
10)Also, check the continuity between B/Br wire
B
and terminal
D
.

HO2S lead wire continuity: Continuity (

)

09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set

Tester knob indication: Continuity test (

)
Is the continuity OK?
11)After repairing the trouble, clear the DTC using SDS tool.
(

5-25)
Step 2 (When indicating C44/P0130:)
1) Connect the ECM coupler and HO2 sensor coupler.
2) Warm up the engine enough.
3) Insert the needle pointed probes to the HO2 sensor coupler.
4) Measure the HO2 sensor output voltage between W/Bl wire
A
and B/Br wire
B
, when idling condition.

HO2 sensor output voltage at idle speed:
0.2 V and less (
+
W/Bl
A
–
-
B/Br
B
)
5) If OK, then pinch the PAIR hose

1
with a proper hose clamp.
6) Measure the HO2 sensor output voltage while holding the
engine speed at 5 000 r/min.

HO2 sensor output voltage at 5 000 r/min:
0.7 V and more (
+
W/Bl –
-
B/Br)

09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set

Tester knob indication: Voltage (

)
NOTE:
HO2 SENSOR VOLTAGE MEASURING CONDITION
1. 10 minutes after the engine start (Idling) or 100 sec. after the engine start (Engine revolution is over 2 000
r/min).
2. Coolant temperature is upper 45 ºC (113 ºF).
YES Go to Step 2. (When indicating C44/P0130:)
NO
W/Bl wire shorted to ground, or W/Bl or B/Br wire
open
1
!
ECM coupler (Harness side)
2
V
2
SA
MP
LE