Mitsubishi Outlander GS45X. Manual - part 944
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-709
STEP 3. Check the left bank heated oxygen sensor (front).
(1) Disconnect the left bank heated oxygen sensor (front)
connector B-14 and connect test harness special tool
MD998464 to the connector on the left bank heated oxygen
sensor (front) side.
(2) Warm up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
(3) Rev the engine for 5 minutes or more with the engine speed
of 2,000 r/min.
(4) Connect a digital voltage meter between terminal No. 2
(black clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the left bank
heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 V
CAUTION
• Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.
• Be careful the heater can be damaged if a voltage
beyond 8 volts is applied to the heated oxygen sensor
heater.
NOTE: If the temperature of sensing area does not reach
the high temperature [of approximately 400
°
C (752
°
F) or
more] even though the heated oxygen sensor is normal, the
output voltage would be possibly low in spite of the rich air/
fuel ratio. Therefore, if the output voltage is low, use a
jumper wire to connect the terminal No. 1 (red clip) and the
terminal No. 3 (blue clip) of the heated oxygen sensor with
the positive terminal and the negative terminal of 8 volts
power supply respectively, then check again.
Q: Is the measured voltage between 0.6 and 1.0 volt?
YES : Go to Step 4.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 11.
AK700104
MD998464
White
Black
AB
Heated oxygen
sensor component
side connector