Mitsubishi Montero Sport (2004+). Manual - part 233
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-345
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear)
connector E-48 and connect test harness special tool,
MB998464, to the connector on the left bank heated oxygen
sensor (front) side.
(2) Warm up the engine until engine coolant 80
°C (176°F) or
higher.
(3) Perform a tracing for 5 minutes or more with the engine
speed of 4,500 r/min.
(4) Connect a digital volt meter between terminal No. 2 (black
clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the heated
oxygen sensor (rear) output voltage.
Standard value: 0.6
− 1.0 volt
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 volts 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 volt-
age is low, use a jumper wire to connect the terminal No.2
and the terminal No. 1 of the oxygen sensor with a (+) termi-
nal and (-) terminal of 12 volts power supply respectively,
then check again.
Q: Is the voltage between 0.6 and 1.0 volt?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (rear).
Then go to Step 5.
AK200498
1
2
3
4
E-48(B)
AB
CONNECTOR: E-48
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MD998464
WHITE
BLACK
AL