Suzuki VL800 Service Manual page 574

18-34 VL800/C/TK9 ('09-MODEL)
7) Disconnect the ECM coupler.
8) Check the continuity between W/Bl wire (#1) C and terminal
W. (For HO2 sensor #1)
Check the continuity between W/G wire (#2) A and terminal
6. (For HO2 sensor #2)
9) Also, check the continuity between B/Br wire B and terminal B.

When using the multi-circuit tester, do not strongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
 HO2 sensor 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?
YES Go to Step 2 (Sensor circuit check).
• W/Bl (For HO2 sensor #1) or W/G (For HO2
sensor #2) wire shorted to ground.
NO
• W/Bl (For HO2 sensor #1) or W/G (Fo HO2
sensor #2) or B/Br wire open.
Step 2 (Sensor circuit check)
1) Connect the ECM coupler and HO2 sensor coupler.
2) Warm up the engine enough.
3) Measure the HO2 sensor output voltage between B wire and
Gr wire [W/Bl wire (#1) or W/G wire (#2) and B/Br wire], when
idling condition.
 HO2 sensor output voltage at id e speed:
4) If OK, then pinch the PAIR hose 1 with a proper hose clamp.
5) 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:
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Voltage ()
NOTE:
HO2 SENSOR VOLTAGE MEASURING CONDITION
* Warm up the engine as follows:
10 minutes at idling or 100 seconds over 2 000 r/min.
* Coolant temperature is upper 45 °C (113 °F).
0.3 V and less (+ B – - Gr)
0.6 V and more (+ B – - Gr)
1
HO2 sensor #1 coupler
ECM coupler (Harness side)
1 HO2 sensor #2 coupler
ECM coupler (Harness side)
2
2
V