Oxygen Sensor Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

13A-108
Equipment side connector
Red
Blue
MD998464
Jumper
wire
Black
Red
White
MD998464
GDI –
On-vehicle Service

OXYGEN SENSOR CHECK

1. Disconnect the oxygen sensor connector and connect the
Oxygen sensor
2. Make sure that there is continuity (11 – 18 Ω at 20 C)
3. If there is no continuity, replace the oxygen sensor.
4. Warm up the engine until engine coolant is 80 C or higher.
Oxygen
sensor
equipment
side connector
5. Use a jumper wire to connect terminal 1 (red clip) of the
Blue
6. Connect a digital voltage meter between terminal 2 (black
7. While repeatedly racing the engine, measure the oxygen
8. If the sensor is defective, replace the oxygen sensor.
special tool (test harness) to the connector on the oxygen
sensor side.
between terminal 1 (red clip of special tool) and terminal
3 (blue clip of special tool) on the oxygen sensor connector.
oxygen sensor connector to the battery (+) terminal and
terminal 3 (blue clip) to the battery (–) terminal.
Caution
Be very careful when connecting the jumper wire;
incorrect connection can damage the oxygen sensor.
clip) and terminal 4 (white clip).
sensor output voltage.
Standard value:
Engine Oxygen sensor
output voltage
When 0.6 – 1.0 V
racing the
engine
NOTE
For removal and installation of the oxygen sensor, refer
to GROUP 15 – Exhaust Pipe and Main Muffler.
Remarks
If you make the air/fuel ratio
rich by racing the engine
repeatedly, a normal oxy-
gen sensor will output a
voltage of 0.6 – 1.0 V.