Suzuki DL650 Service Manual page 208

4-48 FI SYSTEM DIAGNOSIS
Step 2
1) Warm up the engine enough.
2) Insert the needle pointed probes to the H02 sensor coupler.
3) Measure the H02 sensor output voltage at the coupler
(between WIG and BIBr wires) when idling condition.
4) Also, measure the H02 sensor output voltage while holding
the engine speed at 5 000 rlmin.
rn
H02 sensor output voltage at idle speed:
0.4 V and less (@ WIG
-
@
BIBr)
H02 sensor output voltage at 5 000 rlmin:
0.6 V and more (@ WIG
-
@
BIBr)
rn
09900-25008: Multi circuit tester set
09900-25009: Needle pointed probe set
r u
Tester knob indication: Voltage (--)
Is the voltage OK?
1
YES
] G O
to Step 3
I
NO
I
Replace the H02 sensor with a new one.
I
Step 3
1) Turn the ignition switch OFF.
2) Disconnect the H 0 2 sensor coupler.
3) Check the resistance between the terminals (White
-
White)
of the H02 sensor.
rn
H02 heater resistance: 4
-
5 52 (at 23 "CR3.4
O F )
(White
-
White)
NOTE:
*
Temperature of the sensor affects resistance value largely.
*
Make sure that the sensor heater is at correct temperature.
rn
09900-25008: Multi circuit tester set
IU
Tester knob indication: Resistance (52)
Is the resistance OK?
YES
WIB, OIG, WIG or BIBr wire open or shorted to
ground, or poor
@, @, @
or
@
connection.
If wire and connection are OK, intermittent trou-
ble or faulty ECM.
Recheck each terminal and wire harness for
open circuit and poor connection.
NO
1
Replace the H 0 2 sensor with a new one.