Suzuki Samurai 1986, Service Manual

Page: 180 / 482

Checking oxygen sensor
1) Warm up the engine to normal operating
temperature.
2) Disconnect the connector of the oxygen
sensor.
Fig. 5-3-34 Connector of oxygen sensor
3) Connect the voltmeter between the oxygen
sensor side terminal of the disconnected
connector and the ground as shown in below
figure.
NOTE:
Be sure to use a voltmeter whose inner resis-
tance is more than some per IV or a
digital type voltmeter. Any other voltmeter
should not be used because accurate measure-
ments are not obtained.
NEVER apply voltage to the oxygen sensor as
it may cause damage to the sensor.
NEVER connect ohmmeter to the oxygen
sensor as it may cause damage to the sensor.
i
Oxygen side terminal
2. Ground
3. Left side fender
4) While keeping the engine running at 1,500
2,000 rpm, turn the wide open micro switch
“OFF” by moving the lever with the finger as
shown in below figure. Then take the reading
of the voltmeter to make sure it is about
Lever
2. Wide open micro switch
Fig. 5-3-36 Moving lever
3. Carburetor
5) With the engine running at 1,000 1,500
rpm, disconnect the vacuum hose at the in-
take manifold as shown in below figure. At
this time, check to ensure that the voltmeter
indicator is below
Vacuum hose
2. Intake manifold
3 . M C V
Fig. 5-3-37 Disconnecting vacuum hose
6) After checking, reconnect the vacuum hose to
the intake manifold and the connector of
oxygen sensor.
Fig. voltmeter
5-28