Mitsubishi Montero (2004+). Manual — part 378
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-999
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Check the operation of the fuel pump by using scan tool
MB991958 to force-drive the fuel pump.
2. If the fuel pump will not operate, check by using the
following procedure, and if it is normal, check the drive
circuit.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Remove fuel pump relay (2).
Connect terminal number 3 of the harness-side
connector to the battery.
Check if the fuel pump operation sound can be heard at
this time.
NOTE: As the fuel pump is an in-tank type, the fuel pump
sound is hard to hear, so remove the fuel filler cap and
check from the tank inlet.
(3) Check the fuel pressure by pinching the fuel hose with
the fingertips.
(4) Install fuel pump relay (2).
MULTIPORT FUEL INJECTION (MFI) RELAY,
THROTTLE ACTUATOR CONTROL MOTOR
RELAY AND FUEL PUMP RELAY CONTINUITY
CHECK
M1131052000028
AC306409AF
MB991911
MB991824
MB991827
AC203984
1
2
3
4
FUEL PUMP RELAY (2)
HARNESS SIDE CONNECTOR
AB
BATTERY
VOLTAGE
BATTERY POWER
SUPPLY
TERMINAL
SPECIFIED
CONDITION
Supplied
2-4
1-3
Not supplied
−
2-4
1
2
3
4
AK201511AB
MFI RELAY SIDE
CONNECTOR
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-1000
INTAKE AIR TEMPERATURE SENSOR CHECK
M1131002800546
1. Disconnect the volume airflow sensor connectors.
2. Measure resistance between terminals 5 and 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.
ENGINE COOLANT TEMPERATURE SENSOR
CHECK
M1131003100517
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 (140°F)]
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
± 10 N⋅m (22 ± 7 ft-lb)
TEMPERATURE
RESISTANCE (k
Ω)
Higher
Smaller
AKX01407AB
INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR
1 2 3 4 5 6 7
AKX01621 AB
INTAKE AIR
TEMPERATURE
SENSOR
AKX01622
AKX01623 AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-1001
THROTTLE POSITION SENSOR CHECK
M1131003200547
.
1. Disconnect the throttle position sensor connector.
2. Measure the resistance between the throttle position sensor
side connector terminal No. 2 (sensor power supply) and
terminal No. 4 (sensor ground).
Standard value: 2.0
− 4.0 kΩ [at 20°C (68°F)]
3. If resistance is outside the standard value, replace the
throttle body assembly.
ACCELERATOR PEDAL POSITION SENSOR
CHECK
M1131003400046
.
1. Disconnect the accelerator pedal position sensor connector.
2. Measure the resistance between accelerator pedal position
sensor connector terminal No. 1 [accelerator pedal position
sensor (main) earth] and terminal No. 2 [accelerator pedal
position sensor (main) power supply], and between terminal
No.7 [accelerator pedal position sensor (sub) earth] and
terminal No. 8 [accelerator pedal position sensor (sub)
power supply].
Standard value: 3.5
− 6.5 kΩ
3. Measure the resistance between accelerator pedal position
sensor connector terminal No. 2 [accelerator pedal position
sensor (main) power supply] and terminal No. 3 [accelerator
pedal position sensor (main) output]; and between terminal
No.8 [accelerator pedal position sensor (sub) power supply]
and terminal No. 6 [accelerator pedal position sensor (sub)
output].
Normal condition:
4. If the measured values are outside the standard value
range, or if the resistance does not change smoothly,
replace the accelerator pedal position sensor.
AK201173AE
THROTTLE
POSITION
SENSOR
6
1 2 3 4 5
AK201512
THROTTLE POSITION
SENSOR SIDE
CONNECTOR
AB
When accelerator pedal is
gently depressed
Changes comparatively
smoothly in proportion to the
accelerator pedal depression
amount.
1 2 3 4 5 6 7 8
AK201309 AB
Equipment side
connector
ACCELERATOR PEDAL
POSITION SENSOR
ACCELERATOR
PEDAL
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-1002
NOTE: After replacement, adjust the accelerator pedal posi-
tion sensor. (Refer to
ACCELERATOR PEDAL POSITION SWITCH
CHECK
M1131052500056
.
1. Disconnect the accelerator pedal position sensor connector.
2. Check continuity between terminal No. 4 (accelerator pedal
position switch) and No. 5 (sensor earth) of the connector.
Normal condition:
3. If defective, replace the accelerator pedal position sensor
assembly.
NOTE: After replacement, adjust the accelerator pedal posi-
tion sensor. (Refer to
HEATED OXYGEN SENSOR CHECK
M1131005000680
Required Special Tools:
• 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
(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 racing 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) and terminal No. 4 (white clip).
2. While repeatedly revving the engine, measure the heated
oxygen sensor output voltage.
Standard value:
Accelerator pedal
Continuity
Depressed
No continuity
Released
Continuity (0 k
Ω)
1 2 3 4 5 6 7 8
AK201309 AC
Equipment side
connector
ACCELERATOR PEDAL
POSITION SWITCH
ACCELERATOR
PEDAL
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MB991316
WHITE
BLACK
AN
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