|
1.Disconnect the oxygen
sensor connector and connect the special tool Test harness
(MB991316) to the connector on the oxygen sensor
side.
|
|
2.Make sure that there is
continuity (4.5 - 8.0 Ω at 20°C) between
terminal No. 1 (red clip of special tool) and No. 3 (blue
clip of special tool) on the oxygen sensor
connector.
3.If there is no continuity, replace
the oxygen sensor.
4.Warm up the engine until
engine coolant is 80°C or higher.
5.Perform
a tracing for 5 minutes or more with the engine speed of
4,500 r/min.
|
|
6.Connect a digital voltage
meter between terminal No. 2 (black clip of special tool)
and No. 4 (white clip of special tool).
7.While
repeatedly racing the engine, measure the oxygen sensor
output voltage.
Standard
value:
Engine
|
Oxygen sensor output
voltage
|
Remarks
|
When racing the
engine
|
0.6
- 1.0 V
|
If
you make the air-fuel ratio rich by racing
the engine repeatedly, a normal oxygen
sensor will output a voltage of 0.6 -
1.0 V.
|
| caution |
- Be very careful when connecting the
jumper wire; incorrect connection can
damage the oxygen sensor.
- Be careful the heater is broken when
voltage of beyond 8V is applied to the
oxygen sensor heater.
|
| note |
If the sufficiently high
temperature (of approximate 400°C or more)
is not reached although the oxygen sensor is
normal, the output voltage would be possibly low
although the rich air-fuel ratio. Therefore, if
the output voltage is low, use a jumper wire to
connect the terminal No. 1 (red clip of special
tool) and the terminal No. 3 (blue clip of
special tool) of the oxygen sensor with a
(+) terminal and (-) terminal of 8 V
power supply respectively, then check
again.
|
8.If the voltage is deviates from standard
value, replace the oxygen sensor.
| note |
For removal and installation
of the oxygen sensor, refer to GROUP 15 -
Exhaust Manifold.  .
|
|
|
1.Disconnect the oxygen
sensor connector and connect the special tool Test harness
(MD998464) to the connector on the oxygen sensor
side.
|
|
2.Make sure that there is
continuity (11 - 18 Ω at 20°C) between
terminal No.1 (red clip of special tool) and No. 3 (blue
clip of special tool) on the oxygen sensor
connector.
3.If there is no continuity, replace
the oxygen sensor.
4.Warm up the engine until
engine coolant is 80°C or higher.
5.Perform
a tracing for 5 minutes or more with the engine speed of
4,500 r/min.
|
|
6.Connect a digital voltage
meter between terminal No.2 (black clip of special tool) and
No. 4 (white clip of special tool).
7.While
repeatedly racing the engine, measure the oxygen sensor
output voltage.
Standard
value:
Engine
|
Oxygen sensor output
voltage
|
Remarks
|
When racing the
engine
|
0.6
- 1.0 V
|
If
you make the air-fuel ratio rich by racing
the engine repeatedly, a normal oxygen
sensor will output a voltage of 0.6 -
1.0 V.
|
| caution |
- Be very careful when connecting the
jumper wire; incorrect connection can
damage the oxygen sensor.
- Be careful the heater is broken when
voltage of beyond 12 V is applied to the
oxygen sensor heater.
|
| note |
If the sufficiently high
temperature (of approximate 400°C or more)
is not reached although the oxygen sensor is
normal, the output voltage would be possibly low
although the rich air-fuel ratio. Therefore, if
the output voltage is low, use a jumper wire to
connect the terminal No.2 and the terminal No. 1
of the oxygen sensor with a (+) terminal
and (-) terminal of 12 V power supply
respectively, then check again.
|
8.If the voltage is deviates from standard
value, replace the oxygen sensor.
| note |
For removal and installation
of the oxygen sensor, refer to GROUP 15 -
Exhaust Pipe and Main Muffler .
|
|