Mitsubishi Montero Sport (2004+). Manual — part 369
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-889
MULTIPORT FUEL INJECTION RELAY AND FUEL
RELAY CHECK
M1131009900221
INTAKE AIR TEMPERATURE SENSOR CHECK
M1131002800524
1. Disconnect the volume airflow sensor connectors.
2. Measure resistance between terminals No. 5 and No. 6.
Standard value:
13
− 17 kΩ [at −20°C (−4°F)]
5.3
− 6.7 kΩ [at 0°C (32°F)]
2.3
− 3.0 kΩ [at 20°C (68°F)]
1.0
− 1.5 kΩ [at 40°C (104°F)]
0.56
− 0.76 kΩ [at 60°C (140°F)]
0.30
− 0.42 kΩ [at 80°C (176°F)]
3. If not within specifications, replace the volume airflow
sensor.
4. Measure resistance while heating the sensor using a hair
dryer.
Normal condition:
5. If resistance does not decrease as heat increases, replace
the volume airflow sensor assembly.
BATTERY
VOLTAGE
BATTERY POWER
SUPPLY
TERMINAL
SPECIFIED
CONDITION
Supplied
2-4
1-3
Not supplied
-
2-4
AKX01433
MFI RELAY SIDE
CONNECTOR
1 2
4
3
AB
AKX01407AB
INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR
1 2 3 4 5 6 7
TEMPERATURE
RESISTANCE (k
Ω)
Higher
Smaller
AKX01621 AB
INTAKE AIR
TEMPERATURE
SENSOR
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI)
13A-890
ENGINE COOLANT TEMPERATURE SENSOR
CHECK
M1131003100498
CAUTION
Be careful not to touch the connector (resin section) with
the tool when removing and installing.
1. Drain engine coolant, then remove the engine coolant
temperature sensor.
2. With the temperature sensing portion of engine coolant
temperature sensor immersed in hot water, check the
resistance.
Standard value:
14
− 17 kΩ [at -20°C (-4°F)]
5.1
− 6.5 kΩ [at 0°C (32°F)]
2.1
− 2.7 kΩ [at 20°C (68°F)]
0.9
− 1.3 kΩ [at 40°C (104°F)]
0.48
− 0.68 kΩ [at 60°C (140F)]
0.26
− 0.36 kΩ [at 80°C (176°F)]
3. If resistance deviates from the standard value greatly,
replace the sensor.
4. Apply 3M
AAD part number 8731 or equivalent to threaded
portion.
5. Install the engine coolant temperature sensor and tighten it
to the specified torque.
Tightening torque: 29 N
⋅m (22 ft-lb)
THROTTLE POSITION SENSOR CHECK
M1131003200536
Required Special Tool:
• MB991348: Test Harness Set
.
<Checking the Terminal Resistance>
1. Disconnect the throttle position sensor connector.
2. Measure resistance between the throttle position sensor
side connector terminal No. 1 and terminal No. 4.
Standard value: 3.5
− 6.5 kΩ
3. Measure resistance between the throttle position sensor
side connector terminal No. 1 and terminal No. 3.
Normal condition:
AKX01622
AKX01623 AB
Throttle valve slowly open
until fully open from the idle
position
Changes smoothly in
proportion to the opening
angle of the throttle valve
AKX01413
THROTTLE POSITION
SENSOR SIDE CONNECTOR
1 2 3 4
AB
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI)
13A-891
4. If resistance is outside the standard value, or if it doesn't
change smoothly, replace the throttle position sensor.
NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to
.)
.
<Check using oscilloscope>
1. Disconnect the throttle position sensor connector and
connect the test harness special tool (MB991348) in
between.(All terminals should be connected.)
2. Connect the oscilloscope probe to the throttle position
sensor side connector terminal No. 3.
3. Turn the ignition switch to the "ON" position.
4. Slowly move the throttle lever from the idle position to the
full-throttle position and check then if the waveform is free
from any noise.
5. If any noise is recognized, replace the throttle position
sensor.
NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to
.)
HEATED OXYGEN SENSOR CHECK
M1131005000668
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
• MB991316: Test Harness Set
• MD998464: Test Harness
.
<Left bank heated oxygen sensor (front)>
1. Using scan tool MB991958, observe HO
2
S reading. If
values are unsatisfactory, or if a scan tool is not available,
use the following procedure:
(1) Disconnect the heated oxygen sensor connector and
connect special tool MB991316 to the connector on the
heated oxygen sensor side.
(2) Make sure that there is continuity [4.5
− 8.0 ohms at 20°C
(68
°F)] between terminal No. 1 (red clip of special tool)
and terminal No. 3 (blue clip of special tool) on the heated
oxygen sensor connector
AK102987AB
1 2 3 4
THROTTLE POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
MB991348
AKX01462AB
NORMAL WAVEFORM
THROTTLE LEVER
FULL-THROTTLE
POSITION
THROTTLE
LEVER
IDLE
POSITION
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-892
(3) If there is no continuity, replace the heated oxygen
sensor.
(4) Warm up the engine until engine coolant is 80
°C (176°F)
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 terminal No. 4 (white clip of
special tool).
2. While repeatedly revving the engine, measure the heated
oxygen sensor output voltage.
Standard value:
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
8 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 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
volts power supply respectively, then check again.
3. If the sensor is defective, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sen-
sor, refer to GROUP 15, Exhaust Pipe and Main Muffler
.
.
ENGINE
HEATED
OXYGEN
SENSOR
OUTPUT
VOLTAGE
REMARKS
When revving
engine
0.6
− 1.0 volt
If you make the
air/fuel ratio rich
by revving the
engine repeatedly,
a normal heated
oxygen sensor will
output a voltage of
0.6
− 1.0 volt.
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MB991316
WHITE
BLACK
AN
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